(完整版)自行車鏈條線設(shè)計(jì)參數(shù)

1、All About Bicycle ChainlineChainlineThis refers to how straight the chain runs between the front and rear sprockets . Ideally, both sprockets should be in the same plane, so that there is no sideward motion or stress to the chain. This constitutes "perfect chainline".In the case of deraile

2、r geared bicycles, the chainline is not perfect in most gears. The worse the chainline, the worse the mechanical efficienty of the drive train."Correct" chainline for a derailer system is a matter of opinion, and depends on the intended use of the bicycle. There are two "simple"

3、answers to the question of what constitutes proper chainline:1. One view is that the middle of the cluster should line up with the middle chainring (or half-way between the two, in the case of a double.2. From the parts manufacturers' point of view, the chainline depends on the diameter of the s

4、eat tube where the front derailer mounts. For fatter seat tubes where the front derailer is farther to the right, derailer manufacturers want the chainline to be farther to the right also, because their main priority is shifting performance, and their front derailers have an optimal chainlinewith re

5、spect to the edge of the seat tube. This is particularly a concern in the case of bicycles withindexed front shifting.From the rider's point of view, chainline is partly dependent on how you are going to use your gears. For instance, consider a road triple vs a mountainbike triple:With a road tr

6、iple, you mostly use the two bigger rings, the granny is only occasionally used, and only with the larger rear sprockets. For a road triple, having the cranks close-in is good, because it increases the usability of the big ring.With a mountain bike, the small ring is used much more often, and must o

7、ften be used with fairly small sprockets to avoid having to shift the front under load. For mountain bikes, a more outboard chainwheel position is often preferable.Chainline Standards:ApplicationDimensionNotesRoad Double43.5Shimano spec, measured to the midpoint between the rings. with typical 5 mm

8、chainring spacing, this puts the inner at 41 mm, the outer at 46 mm.Road Triple45Shimano spec, measured to the middle ring.MTB Triple47.5-50 mmShimano spec, measured to the middle ring.47.5 preferred, but for frames with oversized seat tubes, the longer dimension may be needed, because the fat tube

9、places the derailer mechanism farther to the right.Track/CoasterBrakeTraditionalOne-SpeedMost internal gear hubs40.5-42 mmOlder bikes with 110 spacing would be on the smaller end of this rangeNewer bikes with 120 mm spacing normally use 42 mmSinglespeedMTB52 mmWider chainline need for chainstay clea

10、rance on MTBs.RohloffSpeedhub54 mm(58 mmThis is close to the chainline of the outer ring of a typical MTB triplew/13 tooth)Singlespeed MTB Alternate47.5 mmWhite Industries ENO hubs use this chainline, which lines up with the middle position of a typical MTB triple.It's also fairly close to the o

11、uter position of a typical "road" double.Chainline Measurement-FrontChainline is measured from the centerline of the frame to the center of the chain.You can measure the front chainline directly with a simple ruler. Simply hold the ruler against the seat tube or down tube and measure the d

12、istance to the middle of the chainring teeth. In the case of triple chainwheel sets, measure to the middle chainring. In the case of doubles, measure to the halfway point between the two rings.Chainline Adjustment-FrontIf you need to adjust the front chainline, there are several different options to

13、 accomplish it:? Change the Bottom BracketMost bottom brackets made since the mid-'90s are symmetrical, they stick out the same amount on each side. If you replace your present bottom bracket with one that is, say, 4 mm shorter, it will move the chainline 2 mm to the left, because it will be 2 m

14、m shorter on each side.If you go this route to a narrower chainline, makesure that there won't be a clearance problem between the frame and the crank or chainring.? Bottom Bracket SpacerIf you need to increase the chainline (move the chainring to the right) you can usually add a spacer washer be

15、tween the right-side bottom bracket mounting ring (or cup) and the bottom bracket shell of the frame. The usual spacer for this is a Sturmey-Archer sprocket spacer. These fit all threaded bottom brackets except Italian size. Sorry, I don't know of any source for a spacer that will fit an Italian

16、 (36 mm) bottom bracket.Chainring SpacersFor a single chainring, you can add spacers between the chainring and the crank spider.If your chainring is mounted on the outside of the spider, you can move it to the rigtht this way. If it's mounteed on the inside of the spider, you can move it to the

17、left as shown.This uses the same 10 mm I.D. spacers normally used on rear hub axles.Suitable spacers are available in 1,2, and 3 mm thickness. You may need to use longer "double" stack bolts , especially for the 3 mm size.? Phil Wood Bottom BracketsPhil Wood BBs are super quality, availabl

18、e in many different lengths, and they also feature the ability to adjust the chainline over a range of several millimeters.Phil Wood stuff is expensive, but it's the Very Best.Chainline Measurement-Rear (For bikes that do not use derailer gearing)To measure rear chainline:? Measure the frame spa

19、cing (or the over-lock-nut dimension of the hub , which should be the same.) (Example: 120 mm)? Divide the result in half. (Example: 60 mm)? Measure the distance from the inside of the rear fork end (or the outside of the axle locknut) to the middle of the sprocket. (Example: 18 mm)? Subtract the dr

20、opout-to-sprocket spacing (Example: 18 mm) from the half-over-lock-nut dimension (Example: 60 mm) to determine the actual rear chainline (Example: 42 mm)For fixed-gear or other single-speed hubs, see below for a chart of different hubs and sprockets. With this chart you can calculate the rear chainl

21、ine by simple addition.Fixed Sprockets and Single FreewheelsI have measured a selection of track sprockets, single freewheels and hubs with respect to chainline (units are millimeters.) The "Chainline" column is the distance from them mounting shoulder to the center line of the sprocket te

22、eth.To figure the actual chainline for a given combination, add the number from the "chainline" column of the sprocket or freewheel to the corrresponding "chainline" column of the hub chosen.Fixed (Track) SprocketsModel/TypeNominalChainlineMeasuredTotalThreadWidth(From Shoulder)w

23、idththicknessThicknessCampagnolo3/32”7.02.08.07.8Campagnolo1/8”6.53.08.07.2E.A.I.3/32"7.132.28.238.05E.A.I.1/8”6.733.028.248.05Miche QuickChange Splined3/32"5.85/5.151.97.727.3Miche QuickChange Splined1/8”5.85/5.153.07.727.3Phil Wood3/32"5.862.37.017.01Phil Wood1/8”6.053.027.567.06Shi

24、manoDura-Ace3/32"6.492.117.557.55ShimanoDura-Ace1/8"7.053.058.587.7Soma3/32"6.371.867.37.3Soma1/8”6.93.008.46.9Sugino Gigas1/8"7.03.08.57.5Sun Tour Superbe3/32"6.222.267.357.35Sun Tour Superbe1/8"6.933.058.467.5Surly New (2005)3/326.42.07.47.4Surly New (2005)1/8”5.937.4

25、7.4Surly Old3/325.282.056.316.31Surly Old1/8"5.072.76.426.42Single Speed FreewheelsModel/TypeNominal WidthChainline (From Shoulder)Measured widthACS3/32"7.962.16Shimano3/32"7.892.08Shimano1/8"8.673.0Tristar1/8"7.712.96WhiteIndustries3/32"8.732.17Single Speed and Fixed G

26、ear HubsModel/Ty peTrack/MTBOLD Spaci ngAdjustable ?*Chainli neCenter to ShoulderLeftSideRightSideDrillingsAmbrosio large flangeTrack120?36FixedFixed32Campagn olo small flangeTrack120Yes36PlainFixed28, 32, 362002Campagn olo C-Record Large flangeTrack120Yes35.9PlainFixed28, 32, 36Gold TecTrack120, 13

27、0, 135Yes39.5FixedFixed32, 36I.R.O.Track120No36.0Fixed/Fr ee32KogswellMTB135No45.3FixedFixed32MicheTrack120Yes36.3PlainFixed28, 32, 36On-One Full MontyMTB135No43.3PlainFree32, 36Phil Wood TrackTrack120, 126, 130No36.75PlainFixedFreeFixed28, 32, 36Phil Wood K.I.S.S.OffMTB135No45.35Plain/Fr eeFixed/Fr

28、 ee32, 36ShimanoDura-Ace7700Track120Yes35.3Fixed28, 32, 36ShimanoDura-Ace7700SmallTrack120Yes35.3Fixed28, 32,36FlangeShimano Dura-Ace7600 Large FlangeTrack120Yes35.4Fixed28, 32,36SovosTrack112Yes33.5FreeFixed36SpotMTB135No47.25PlainFree28, 32,36SurlyTrackTrack120Yes36.22FreeFixed32Surly 1 x1MTB135Ye

29、s46.5FreeFixed/Fr eeDrillin gsSuzueBasicTrack117-120Yes34.74FreeFixed28, 32,36Suzue Promax (cartridge )Track120Yes35.0FreeFixed28, 32, 36SuzuePromaxNJSTrack120Yes35.0FixedFixed28, 32, 36VanDessellMTB135No45.9FreeFixed32WhiteIndustriesENOTrack/MTB126, 130, 135No39.1FreeFixed28, 32,36Chainline Adustem

30、ent-RearThere are a number of options for adjusting rear chainline on bikes with a single rear sprocket:? Axle Re-Spacing/Re-DishingThis is the usual way to go for converting bikes from a multi-speed derailer setup to a single-speed fixed-gear or freewheel drive.The spacers are located just behind t

31、he outer locknuts, between the locknuts and the cones (or the bearing mounting nuts, if your hub uses cartridge bearings.) You will need cone wrenches and a general understanding of hub bearing adjustment to do this job.Assuming the rear hub's spacing already matches your frame's spacing , y

32、ou can take spacer washers from one side of the hub and movethem to the other side, thus shifting the entire hub from side to side. In the case of a hub originally meant for a multi-speed freewheel, there is usually a rather thick spacer on the right (freewheel) side of the hub. You can replace this

33、 with a stack of thinner spacer washers that add up to the same overall thickness, then distribute the washers from side to side as needed to get the chainline where you need it to be.Once you have done this, you'll need to re-dish the wheel by adjusting the spokes. This is a bit of trouble, but

34、, in the casee of multi-to-single-speed conversion, the re-dishing actually results in making the wheel muchstronger than it was.If you're using a flip-flop hub, re-spacing the axle will likely makethe flip-flop feature unsuable, unless you also use a double chainring in front.? Sprocket Dishing

35、Most internal-gear hubs have "dished" sprockets that can be installed either dished in, or out, providing a choice of two different chainlines.Fixed-gear sprockets are usually intended to be installed with the flange facing inward, so the teeth are outboard. However, in many cases, it is possible to flip a fixed-gear sprocket over if you need to move the rear chainline to the left.? Spacing WashersSturmey-Archer internal-gear hubs generally have two 1/16" (1.6 mm) spacer washers next to the s