(完整版)自行车链条线设计参数.doc

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(完整版)自行车链条线设计参数
This refers to 13
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 often 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:
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w/13
tooth) Singlespeed
MTB Alternate mm
White 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 outer position of a typical "road"
double.
Chainline Measurement-Front
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Chainline 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 distance 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-Front
If you need to adjust the front chainline, there are several different options to accomplish it:
?Change the Bottom Bracket
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Most 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 mm shorter
on each side.
If you go this route