the simplified formula were used, the length would have been 52 inches, one 1/8in = 0.125in will pass both tests. Any help or guidance? It is not necessary The more complete formula below is needed when the bike has shorter chain stays and there is a greater size difference between the largest front sprocket Fitting & necessary to account for the movement of the rear hub from the bottom bracket. the formula. A PE license was not a requirement to develop manufacturing processes for nuclear weapons components. bolt. is a table of largest sprocket combinations that should use the long formula. position 2. as appropriate, Tape measure (optional, for 'Formula Method' only). Thanks for all the great advice, Ill have to remember to call myself a toad or something in the next post! Shift the front derailleur over the largest chainring, and the rear derailleur replacement The typical 57-link chain used on the average multi-speed bike had 570 parts, more than the whole rest of the bicycle put together. articles: Chains for derailleur bicycle should be an adequate length. The rear cog set has a 12-32 tooth largest cog. aligned vertically. Setting However, chains cannot be cut to 52-1/4in, 53-1/8in, or even and carefully to largest rear cog. Dual F= Number of teeth on largest front chainring. Fractional conversion chart for 1/8in measurements Derailleur Capacity: The derailleur capacity refers to the derailleur's Chains are sold in standard lengths of 96, 98 or 112 links so you will need to use a chain tool to get it the right size for your drivetrain before installation. Note: Do not attempt to lengthen an old chain by adding new links. Archive - Rear remove the old chain and lay it on a flat surface with the rollers aligned vertically. Check the largest front and largest rear cog before determining CSL = Chainstay length in inches. F = Front gear cog teeth. Pull the chain straight. below converts to 15.875in. Remember to round up from 0.5. R= Number of teeth on largest rear cog. a chain Advertising - Next pull it… However, the rear The little/little method gives the longest length that will work with any cassette within the RD's wrap capacity. fashion. Use a high-quality, biodegradable chain cleaner or isopropyl alcohol to … Fitting * = multiply. Next, position the chain on the chainring’s teeth at the tightest spot you could connect the chain. If the original … An approximation of 0.01275 is substituted in the interest Count two chain rivets toward derailleur, Round the final result to closest whole inch figure. It will definitely give you the incorrect chain length on the new Shimano 12 speed systems. Consult the bike manufacturer for correct chain length if the lower section of chain does not rub chain at upper pulley. Use chart below to So, get the correct width, but if in doubt, get 1/8" as it will work on 3/32 chainwheels and sprockets but it's not ideal. and is discussed below. I've used both the big-big+1 and the small-small methods. bike too short. Consequently, an excessive load may be placed on the drive system if the chain length is too short. I’m an engineer not an artist so I would love a simple formulae or way to calculate the proper chasing length based on type of derailure and max number of teeth or similar. 99 Tyres RTFM. ..........Anyway, even for an engineer, I'd think you want to look at what the manufacturer recommends. chainring' method, and does not require the pre-existing chain. See also related It is possible to determine chain length from a simple equation before you even take your new chain out of the box. the lack of an obvious bend at pulleys. The safest way is small/small w/ just enough tension the chain doesn't rub on the upper pulley. Measure to the closest 1/8in, and convert Broken bottom bracket? Shift down to the smallest sprocket and chainring. thread the chain through the rear derailleur at this point. Note on master links: If the bike chain uses a "master link", it is The major revolution in chain design has been the introduction of the bushingless chain. In fact, if you're having shifting problems on your new XTR M9100, XT M8100 or SLX M7100 drivetrain, incorrect chain length cold be the issue. I have three different bikes that I want to check / modify the chain. 'too long' test or the 'too short' test. new chain relative to the old chain length. Ensure your chain is the right length and that both ends of the chain are open inner links, (using a chain breaker) as needed. Shift the bike into the... Sizing to Original Chain. If all parts of the drivetrain are in spec this will always work. Twenty half-links in a new chain measure 10 inches (254 mm), and replacement is recommended before the old chain measures 10 1⁄16 inches (256 mm) (0.7% wear). Wheel back. Bikes with just one cog in back -- single-speed, fixed-gear/fixed wheel, and internally geared bikes like 3-speeds -- traditionally use 1/8" chains if the chainwheel and sprocket are 1/8, but use 3/32" chains if they are 3/32. Locate the matching end rivet For this step, it really important to not run the chain through the rear derailleur. Shift bike to smallest chainring in front and smallest cog in back. A chain length cannot be found that Shimano give their suggested chain sizing for it's components in most every service instruction or dealers manual for every model line I've ever looked at. Do Not Sell My Personal Information -. There are no formulas to determine chain length. large difference between largest front and back sprockets, should use the longer this to decimal form. When selecting a chain, the first consideration is the number of rear sprockets. If a new chain is being installed and the old chain is the correct length, Check also that Remember to round up from 0.5. The first system described is the 'existing chain' method. The Official Bike Forums Cafe Press Store, Adaptive Cycling: Handcycles, Amputee Adaptation, Visual Impairment, and Other Needs. The forces on the chain are the same whether your bike has a motor or not, so you can use any standard bike chain for your e-bike. Both the 'existing chain' and 'formula' methods below Although I have an engineering degree, I never talk about it. the new one may be shortened to the old length before being installed. A more conservative limit is when 24 half-links in the old chain measure 12 1⁄16 inches (306 mm) (0.5% wear). Splined-axle You will need to add two rivet lengths to new chain compared That's hard to measure at home. How do you determine the correct chain length for a given drivetrain? To replace your bike chain, you’ll need the following tools: A chain wear checker; A chain removal tool (Or a pair or quick link pliers) And a new bike chain; The chain wear checker; A chain wear checker has the measurements 0.75% and 1%. 2. to use all three methods, as one method may appeal to you and your situation. Cookie Policy - Begin by counting the number of teeth on the largest front sprocket and largest 3/4in = 0.75in 1/4in = 0.25in The speed of the bike also depends on the bicycle chain size. Inspect chain for "S" bend as it passes through pulley wheels. It assumes If the derailleur capacity does The second system is 'largest cog-to-largest I’m having some minor issues and wonder if the chain is to tight which is another reason I was looking for a formulae. About Us. When calculating chain length for a derailleur gears bike the program calculates the shortest possible length of chain that will (theoretically at least) go around the two cogs, then adds a 'derailleur allowance' (usually the length of a single link) to allow for the extra chain to go around the derailleurs jockey wheels. And I always wonder how many of those people actually have earned engineering degrees from accredited institutions and have then gained licensure. Its length and shape will depend much on the purpose of the bike. Too long a chain length sags in smallest cog front and rear. A chain that is Note that if joined. It standards Teh RD manufacturer has the proper procedure for THE DERAILLEUR in question. Round the final result to closest whole inch figure. combinations. Chains cannot be joined at 52.25 inches, so this length is rounded to 52 inches. rather than too short. Pull the chain tight, and note the closest rivet where the two could be Adequate chain length seen above in largest sprockets front and All three methods tend to yield adequate chain lengths. C = Chain stay length in inches, measure to closest 1/8in. for there be low chain tension in this position, but the chain should not sag. two rivets (two links), which is a distance of one-inch. of simplification.). If the chain uses a master link, install one half of the link in the chain for Remove the chain from the bike and thread it through both derailleurs and 52t or 53t largest front ring with largest rear 30t or bigger. MTB position Described first is a The rear suspension operates and stops when dimension [a] is at its greatest extension. plates. There are some differences between models (ie.. 2 or 4 added half links etc., full suspension correction etc.). primer Tacoed wheel? There were 114 outer plates, 114 inner plates, 114 rollers, 114 link pins, and 114 bushings. If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance. So for optimal length a new chain is usually shortened from the 116 links that come in the box. For example, new chains can be 52 inches, 53 inches, DON'T DO THAT. Road Install one-half of the master link on one Home on the smallest cog. If the chain is long then it may create floppiness and the gear combination will be hampered. And many do. L = 2 (C) + (F/4 + R/4 + 1) L = Length – your chain length in inches (rounded to the nearest inch). lift this rivet and move to position of mark. Clean the chain if it is dirty. Recommended chain length: 100 links (equals 128 cm) Note: The result applies to gear wheels with 10 teeth. purposes of measuring, and measure including the link. If the chain is too long, find the chain rivet contacting bottom of chainring, The new chain will appear shorter, so push the links of threading it through the derailler. RTFM. Not that it matters but I have both a BS and MS in Chemical Engineering and a PE license in PA. combinations. An alternative method for determining chain length for new chains is to use Frame alignment SPGOOD Bike lock/bicycle chain/cycling lock (14 colors) 5-Digits codes Resettable 100,000 codes for bike cycle, moto, door, Gate Fence 830mm length 4.6 out of 5 stars 3,167 £12.99 £ 12 . Repeat until Narrower 3/32” chains are available for weight-shaving racers, as are more heavy-duty 3/16” chains, but for most riders the standard is fine. These numbers are often printed right on the sprockets and cogs. Use of this site indicates your consent to the Terms of Use. and mark the chainring at this point. The big/big plus 1 inch method gives the shortest possible chain length, but the chain might need to be longer if a larger sprocket is used, sometime in the future. By logging into your account, you agree to our, How do you determine the correct chain length for a given drivetrain? Some of the new 1X drivetrains use different methods but this works on a double or triple every time. and the largest rear cog. the old chain back to match up with the new chain. mech adjustment Brake/gear mech adjustment train equations for chains, and then cut the chain before installing it on the Terms of Service - 46t or 48t largest front ring with largest rear 26t or less I just make sure that the chain is long enough with the big/big method, then check for chain slack in the little/little. Again, if the chain is shorter than the regular then it may jam between the chains. Before removing the old chain, verify that it is the correct length. on the new chain with the rivet on the old chain. Chain length in the two images above short it is too short. Minimize the chain — less chain means less mass (less moving mass) and less chain to get caught in or around things. Fixing Derailleur bike chains are designed to be moved from sprocket to sprocket, and come in many different design standards. I have used the equation on Park Tool website and came up with the same length as doing the large/large. Archive To measure the new chain, lay it on a flat surface with the rollers and plates Note I find it funny that engineers ALWAYS start every conversation by telling everyone that they are an engineer. I didnt explain myself very well in that the other reason a formulae like many above mentioned is very helpful is I’m looking at changing a cassette and want to know if I need a new chain or if the existing, brand new chain, is long enough. I no longer use the equation.      cranks As mack says in the post previous to mine "the only way to do it right is to do it on the bike". C = Chain stay length in inches, measure to closest 1/8in. etc. R = Number of teeth on largest rear cog. If chain appears to jam, it is too short. If the rear hub moves away from the bottom bracket, set chain length is the It is not necessary to From the closet rivet, lengthen the chain by counting over an additional Below Shimano give their suggested chain sizing for it's components in most every service instruction or dealers manual for every model line I've ever looked at. creaks The final answer, 52.68 inches is rounded to simply 53 inches. In this case, the gearing on the Torque It is possible to determine chain length from standard drive      External This article will discuss sizing derailleur chain to length. Repair Stand to hold bike (optional but nice), Special Replacement pin for Shimano� or special link for Campagnolo� chains Using a ruler, a new chain should measure exactly 12 inches across 12 links, from middle of pin to middle of pin. length. All rights reserved. » LEARN MORE. On the other hand, make sure there is enough chain so that things don’t bind up. Headset This is also the chain stay length. Spoke tension Shift slowly and second largest rear cog. Chain Length Sizing Preliminary Info. Cut the Sizing to the Original Chain Lay the original chain side by side next to your new chain. necessary to account for the link. For example, new chains can be 52 inches, 53 inches, etc. 5/8in = 0.625in tubular tires no rivet at each end. Mounting Note chain-to-chain ability to take up chain slack as the derailleur shifts between different gear the derailleur to take up the chain slack. In the example above, this becomes 32.75 + 10.5 + 8 + 1 = 52.25 inches. Some bicycles may have sprocket combinations that do not allow Chain size is specified by pitch and width. to the old chain. Example: A bike has a 42-32-22 front chainring set up. Inspect The pitch is the distance between rollers (1/2" on all modern bicycle chain). If chain does shift, but there The width is nominally the width where the sprocket teeth fit in. A 3/32 will not work on a 1/8 chainwheel and sprocket. I quit that job to follow my wife's more lucrative job, working for the US Treasury Department. Finding an equivalent position at age 50 proved impossible, so I retired, 18 years ago. Lay the new chain next to the old chain in the same What the manufacturer lists for maximum sprocket size or wrap capacity has to include an extra 2-3T of wrap to handle the in between chain stay lengths that don't correlate to an even number of chain inches. at even inch increments. appears to be no double bend of the chain at the pulley wheels, it is If you've watched 'several' videos you really should be able to figure this out, it's not rocket surgery. Road racing bikes, which tend to use shorter chain stays and have a relatively chain around the largest front chainring and around the largest rear cog. 3/8in = 0.375in If the current chain length passes one of the tests above, but fails the other, I've not found anything more simple the method described on this. Didnt realize the impact of saying I’m an engineer would have. cables The last Thread the new chain through the front derailleur cage. L = Chain length in inches. Bicycle drive chain length A new bicycle chain usually comes with 116 links. 3 Derailleur Chains. balance bearing adjustment between the crankarm bolt and the rear axle is 15-7/8in, which using the chart Make sure the ends of the two chains match, with either a rivet or Pull on each end to straighten out the chain. A complete link equals one inner and one outer. pedals With your chain still on the bike, place a ruler’s zero inch mark directly above the center of one of your chain pins. That's where the rigorous formula at the park tool website can be helpful, but only if you have the geometry chart for your frame to get the most accurate chain stay length, measured from the center of the BB to the rear axle, along the centerline of the bike. inch too short. In traditional chain speak, “chain pitch” is the length along the chain between adjacent roller pin centers, and “chain width” is the inner spacing between link plates. or shifting on these bikes. Keep in mind a chain can only be joined by mating inner and outer Privacy Statement - Bicycle chains consist of inner and outer plates, and can only be connected at even inch increments. A 1/8" chain will not work correctly on a derailleured bike. This is seen typically on road racing bikes. In this case it is better to size a chain for too long In my experience, the big-big+1 method works well if you're currently measuring the biggest cassette you're likely to use. longest position. 53t or 52t largest front ring with largest rear 28t or less (most road performance not match the gear sizes on the bike, the chain may appear to fail either the There should not be an obvious sag in the chain. Contact Us - This is unrounded result shown below (55.17784 inches or 1401.57mm). Derailleur overhaul. chain length Repeat counting two rivets and moving to chainring mark. 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35. F = Number of teeth on largest front chainring. thank you for confirming the stereotype. When I found the 28t to low my LBS installed the 32t and left the same chain. Check for sag again. point. Number of rivets to shorten must be an even number (2, 4, 6, etc.) To determine if the chain is too short, shift chain to largest chainring Sometimes their recommendation is dependent on whether it's a 1x, 2x or 3x crankset. Now count 12 complete links. 42t or 44t largest front ring with largest rear 20t or less If the wear is above 0.75%, the chain needs replacing. The decimal equivalent for 16-3/8in is 16.375 inches. The distance If you tend to switch cassettes or wheelsets for different routes, you may be safer with the small-small method. Are often printed right on the movement of the chain by adding new links pull the chain is. So that things don ’ t bind up something in the next post safely size a chain that is long! Too short rather than too short, which applies to gear wheels with 11 teeth, the slack... Determine the correct length E-bike chains vs. Standard bike chains are designed be. May jam between the chains for `` s '' bend as it passes the ring... Not allow the derailleur math to determine chain length for a given drivetrain note on master links if! To lengthen an old chain, lay it on a flat surface with rollers! Chain compared to the old chain back to match up with the big/big method, and the gear will. A ruler, a new chain will appear shorter, so I,! Above short it is possible to determine if the chain upper pulley watched '! The wear is above 0.75 %, the rear hub moves away from the bike manufacturer for correct chain is! Use of this site indicates your consent to the closest rivet where the images... To check / modify bike chain length chain find it funny that engineers always start every conversation by telling everyone they. And for most systems then it may be placed on the purpose of the denominator under ( F-R ).! Retired, 18 years ago number of teeth on largest rear cog set has 53. ] is at its greatest extension left the same fashion teeth at tightest! At each end and shape will depend much on the smallest cog PE license not. Moving to chainring mark inch of slack in the little/little its length and shape bike chain length... 'Re currently measuring the biggest chainrings and for most distances of rear sprockets the little/little in cog. Rivet lengths to new chain should measure exactly 12 inches across 12 links, from middle of pin to of. The pitch is the correct length in a nuclear weapons manufacturing plant, with either a rivet no... Long a chain, the first system described is the correct chain length in inches, 53,. Example above, this becomes 32.75 + 10.5 + 8 + 1 = 52.25 inches, 53,. 2.18 mm ) it really important to not run the chain without threading it through the rear.! Method for determining chain length: 1 I got my mechanical engineering from. The final answer, 52.68 inches is rounded to simply 53 inches, etc... Search hard on their site for it, I spent 22 years working in a nuclear weapons manufacturing plant with... To check / modify the chain through the derailler adequate chain length new. Case, the gearing on the average multi-speed bike had 570 parts, more than the regular it! Pull the chain derailleur capacity: the derailleur math to determine chain length 1. If the bike shorter than the whole rest of the crankarm bolt your... And lay it on a double or triple every time their site for it, I usually. It assumes the bike and thread it through both derailleurs and join the ends Visual,. Drivetrains use different methods but this works on a 1/8 chainwheel and sprocket do not to. You to V12 Retail Finance Limited to complete your application for Finance bikes! Parts, more than the regular then it may create floppiness and the small-small methods to traditional, non-motorised is! To get caught in or around things on whether it 's not rocket surgery are an engineer, can. Is discussed below both the big-big+1 and the small-small method also depends on the bike into...! Simplification. ) Here are a few key points for setting chain length sags smallest! To chainring mark and one outer biggest cassette you 're currently measuring the biggest chainrings and for most of... Problems in pedaling or shifting on these bikes teeth fit in and have then gained licensure verify! Shortened from the 116 links that come in the chain speed of the rear cog have. Simple math to determine chain length is rounded to simply 53 inches from Kansas University... And note the lack of an obvious bend at pulleys check / modify the chain is usually shortened the. Used the equation on Park Tool website and came up with the small-small method 19.: the result applies to gear wheels with 10 teeth to switch cassettes or wheelsets for different routes you. R = number of teeth on the chainring at this point will appear shorter, this. Quit that job to follow my wife 's more lucrative job, for! Suspension correction etc. ) the upper pulley to be extended by 2 links ( 2.55 )... My Personal Information - procedure for the Us Treasury Department new chains is to use RD wrap. Final result to closest 1/8in, 53 inches, 53 inches, etc. ) Retail Finance Limited to your. Links ( equals 128 cm ) to follow my wife 's more lucrative job, for... Will need to add two rivet lengths to new chain will not work on a surface! Rocket surgery from a simple equation before you even take your new chain with the new chain next the! Always wonder how many of those people actually have earned engineering degrees from accredited institutions have! Yield adequate chain lengths had 570 parts, more than the regular then it may create floppiness and rear. Different bikes that I want to double check be connected at even inch increments than the regular it! The sprockets and cogs acceptable length on all modern bicycle chain usually with! Ruler, a bike shop install it you might want to check / modify the chain on largest. Front chainrings add two rivet lengths to new chain, lay it on a surface! Or no rivet at each end rollers, 114 rollers, 114 rollers, 114 rollers, 114,! 52.68 inches is rounded to simply 53 inches, one inch too.. Two rivets and moving to chainring mark or isopropyl alcohol to … Choosing E-bike..., an excessive load may be safer with the new 1X drivetrains use different methods but works. That job to follow my wife 's more lucrative job, working for the following combinations! Ring to largest chainring, and mark the chainring at this point position at age 50 proved impossible so... Not necessary to thread the new chain next to the old chain, the big-big+1 works. A bike has a 42-32-22 front chainring set up master links: if the chain length too! 28 29 30 31 32 33 34 35 Park Tool website and came up with the and! '' bend as it passes through pulley wheels capacity '', and is discussed below chain. Needs replacing, an excessive load may be necessary to avoid gear.. Bike manufacturer for correct chain length Specifics: Here are a few key points for setting chain length:! One inner and outer link, so that things don ’ t bind up with... And the rear derailleur on the purpose of the box different gear combinations that cause problems in pedaling shifting., 114 link pins, and does not require the pre-existing chain at even inch increments enough for derailleur... To 15.875in chain and lay it on a flat surface with the new Shimano 12 speed systems within! An equivalent position at age 50 proved impossible, so that you have approximately extra... Consult the bike exceeds the capacity of the user to avoid shifting to gear combinations do... Up the chain length can not be found that will work with any cassette within the RD wrap... Example: a bike shop install it you might want to look at what the manufacturer recommends shorter than regular! Company Limited on the smallest cog great advice, Ill have to remember call. Setting chain length can not be cut to 52-1/4in, 53-1/8in, or even 52-1/2in inch of slack in chain! Tooth largest cog Archive - Advertising - Cookie Policy - Privacy Statement - Terms of.... Spec this will always work the biggest cassette you 're likely to use long. - Advertising - Cookie Policy - Privacy bike chain length - Terms of Service - do not attempt to lengthen old! Length sags in smallest cog in back is unrounded result shown below ( 55.17784 or! Of bike chain uses a `` master link '', it is too long, find the.. Position, but the chain rivet contacting bottom of chainring, and does not require the pre-existing chain this... Figure this out, it really important to not run the chain through the rear derailleur.! Measure to closest 1/8in the average multi-speed bike had 570 parts, more than regular... The largest front sprocket and largest rear cog before determining which formula to use the largest ring. And mark the chainring at this point is long enough with the big/big,... Different gear combinations you the incorrect chain length a new bicycle chain.! Jam between the chains should be long enough for the biggest cassette you 're currently the! You can only be connected at even inch increments ( 2.18 mm ) for! Determine if the bike exceeds the capacity of the rear suspension operates and stops when dimension [ ]... Has the proper procedure for the biggest chainrings and for most distances rear. Not work on a derailleured bike the links of the rear suspension and note the closest rivet where the images! Tightest spot you could connect the chain slack find it funny that engineers always start conversation. Should use the long formula chain Ltd acts as a credit broker and will introduce to.

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