1x10 chainline

Discuss light weight issues concerning mountain bikes & parts.

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HillRPete
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by HillRPete

Sorry for reposting this from the road forum, didn't get an answer there, this is probably the more appropriate place for 1x10 setups.

I'm building an 1x10 bike for the dark season. Can anyone help me out with the chainline? I found a Truvativ Isoflow Singlespeed crankset, it comes with power spline BB, either of 108/113/118mm axle. Which one would give me the right chainline? BB is standard 68mm english threaded, rear dropout spacing is 130mm (cyclocross frame).

Many thanks.

Edit: crohnsy is right, power spline BB
Last edited by HillRPete on Thu Sep 13, 2012 9:08 am, edited 1 time in total.

crohnsy
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by crohnsy

Depends on the cranks offset but either 108 or 113. Also your cranks are not likely gxp. They are power spline iirc.

You'll need a power spline BB for them.

by Weenie


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yourdaguy
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by yourdaguy

The 3 widths are made to line up with the rear spacing. 108 is generally or standard road spacing of 130. 113 is generally used with MtB spacing of 135 and the widest is for tandems that have 145-165 rear spacing. That said, with some setups it might work better with one size different. Measure from the center of your frame to the center of the rear cassette (between cogs 5 and 6). That is the chainline you want. The specs for the chainline of the crank should be on TruVative's site.
For certain parts stiffer is more important than lighter.

TuscanySwe
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by TuscanySwe

Depends on what hub you are using it with, no?

108 would put that crank at 46chainline and 113 at 48.5
so 108 would be equal to a standard double road cranks outer chainring.

all according to this thread:
http://forums.mtbr.com/drivetrain-shift ... 92660.html

An eno hub is set for 47.5 if thats what you are using. Believe its like 43 if using the fixed side / version.
If you are using a cassette hub with cog and spacer you can move it to where the chainline is straight no matter what axle lenght you have upfront (more or less).

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2002maniac
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by 2002maniac

TuscanySwe wrote:Depends on what hub you are using it with, no?


Not really, hub type would really only be relevant for a single speed.

TuscanySwe
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by TuscanySwe

2002maniac wrote:
TuscanySwe wrote:Depends on what hub you are using it with, no?


Not really, hub type would really only be relevant for a single speed.


How is that different from what i said ?
Edit: I guess its kinda out of the question since title says 1x"10"

HillRPete
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by HillRPete

For the record, I went with a Truvativ Stylo with GXP BB, and the chainline is way off on the low gears. Need to look into chainring spacers, as it seems ...

by Weenie


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