Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)
View Poll Results: which bottom bracket should I run with this setup?
110mm as recommended on the Orign 8 website for a 45mm chainline
3
37.50%
103mm and explain why?
0
0%
107mm and explain why?
3
37.50%
other
2
25.00%
Voters: 8. You may not vote on this poll

Crank and chainline question

Old 05-02-11, 09:57 PM
  #1  
CBRaceRR
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Crank and chainline question

First of all, I have been riding fixed gear for a little over a year now. I decided I want to build another bike and I have a quick question for those of you who know more about this than me... Also, I apologize if this question has been discussed elsewhere.

I recently bought an Origin 8 Trackstar Crankset (got it for a steal at a local bike shop sale, so spare me the "origin 8 sucks" comments)

It claims on their website to use a bottom bracket with 110.5mm spindle length for a 45mm chainline.

My question is don't most fixed gear bikes use a 42mm chainline? So when I attach the sprocket to the rear wheel isn't the chainline going to be slightly off? I know I could probably use spacers, etc. but I want a straight chainline without messing around with all that.

Is anyone else out there running this set-up? Should I buy the 110mm bottom bracket like the website says and just see what happens? Or should I run a different, more common BB size like 103 or 107? Sorry if this sounds stupid I just don't know much about chainline.

Also, I have read Sheldon Brown's article on chainline and it didn't help answer my BB question without buying one of the sizes and testing it out. I am hesitant to go this route, since once I mount the BB to the bike I likely won't be able to take it back and will have wasted my hard earned $$

Thanks in advance
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Old 05-02-11, 10:00 PM
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Pretty sure a 110mm spindle produces close to a 42mm chainline with the chainring on the inside. Using a 107 will most likely allow you to leave it on the outside.

Also - a chainline off by a few mm isn't something you'd even notice.
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Old 05-02-11, 10:15 PM
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I would like to leave the chainring on the outside since it looks better cosmetically, so I guess your vote is 107

I agree, a few mm would be hard to notice, I just want to get it right before ordering all the parts
Originally Posted by Scrodzilla View Post
Pretty sure a 110mm spindle produces close to a 42mm chainline with the chainring on the inside. Using a 107 will most likely allow you to leave it on the outside.

Also - a chainline off by a few mm isn't something you'd even notice.
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Old 05-02-11, 10:26 PM
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I voted Campy.
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Old 05-03-11, 12:01 AM
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are you referring to the 68x111? That doesn't necessarily solve my chainline concern
Originally Posted by rustybrown View Post
I voted Campy.
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Old 05-03-11, 12:19 AM
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Originally Posted by CBRaceRR View Post
are you referring to the 68x111? That doesn't necessarily solve my chainline concern
Not at all.

What's your chainline? Deduce from there.

Rear wheel mounted, measure cog distance from middle of hub.

Use mock up spare BB to attach crank.

Flat edge from cog to crank. Take measurement from edge to middle of BB shell.

+/- difference.

Last edited by rustybrown; 05-03-11 at 12:31 AM. Reason: for simple over-complication.
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Old 05-03-11, 11:41 AM
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I'm still in the process of buying all the parts, so I don't have the frame yet.
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Old 05-03-11, 02:20 PM
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That is your problem right there. You are supposed to have a big pile of wheels and bottom brackets that you can mix and match. Throw in a few pairs of cranks and you will get something to fit.
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Old 05-05-11, 12:18 AM
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so no one else has an origin 8 trackstar crank and can offer some insight?

I want to do it right so I can avoid the headache and hassle of buying/returning parts multiple times. I'm leaning towards the 107mm BB...
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Old 05-05-11, 05:36 AM
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Honestly, if Origin 8 is saying it calls for a 110, use a 110. If it doesn't work, take it up with them.
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Old 05-05-11, 05:48 AM
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Originally Posted by CBRaceRR View Post
I'm still in the process of buying all the parts, so I don't have the frame yet.
wait wait wait wait, you are buying all the parts before you even have a frame?
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Old 05-05-11, 05:57 AM
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Perfect.

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Old 05-09-11, 01:49 PM
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Originally Posted by vw addict View Post
wait wait wait wait, you are buying all the parts before you even have a frame?
Yes, I'm buying the parts because my local bike shop had a huge sale. I'm getting the frame for my birthday in a few weeks (IRO Mark V Pro)
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