How to Determine What Spindle Length is needed for SS Bottom Bracket?
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How to Determine What Spindle Length is needed for SS Bottom Bracket?
I'm converting my Trek 520 to a single speed and want to replace the current triple crankset (which has an integrated bottom bracket) with a Sugino Messenger crankset and accompanying square taper bottom bracket. My question is how do I determine which spindle length I should be using? The BB on my Trek 520 looks to be wider than other road bikes I have seen. Prior to swapping to a different triple crankset, I used to have a BB with a 118.5 length spindle I believe -- but this would only be appropriate for a triple crank, correct? If anyone can help with how to measure/determine what spindle length I need for a square taper bottom bracket that would be used for a single speed on my Trek 520 it would be great. Or conversely if you just happen to know the length that would be great too!
Thanks in advance.
Jeff
Thanks in advance.
Jeff
#2
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You Have measurements to do Chain line, and the Q of the crank are 2 ( arms on same side rather than crank placed
measure how far apart they are with one BB on it , and see how much width the chainstays
are where the crank arm passes by..
and in this situation, you will need a lot of pictures of each step in the process for remote help here ..
Internet sellers wont be any help , they will ship you parts, But, you need a local bike shop ..
measure how far apart they are with one BB on it , and see how much width the chainstays
are where the crank arm passes by..
and in this situation, you will need a lot of pictures of each step in the process for remote help here ..
Internet sellers wont be any help , they will ship you parts, But, you need a local bike shop ..
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I've seen BBs at 103mm width being sold for SS/FG applications, so that could be a good legnth for you. 118mm was pretty common for double cranks in the 80's specially with French bikes with Stronglight or TA cranks, but 118mm must have been appropriate for non-French triples. 113mm was the typical legnths to accomodate double cranks like Shimano DA.
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The Sugino Messenger should have a recommended BB info with it.
Edit: quick Yahoo search came up with 103mm JIS all around, that is if you are using a 42mm chainline.
Are you using a proper 42mm hub/wheel in the rear?
Edit: quick Yahoo search came up with 103mm JIS all around, that is if you are using a 42mm chainline.
Are you using a proper 42mm hub/wheel in the rear?
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Last edited by Ex Pres; 09-15-10 at 01:48 PM.
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I don't know how much help it is, but I can tell you what I would do.
1. Trial fit your selected crankset with any bottom bracket that you happen to have on hand.
2. Install your rear wheel with the cog in place.
3. Now you can align a straight edge against your chainring and easily measure how far in or out your crank needs to go for perfect alignment.
1. Trial fit your selected crankset with any bottom bracket that you happen to have on hand.
2. Install your rear wheel with the cog in place.
3. Now you can align a straight edge against your chainring and easily measure how far in or out your crank needs to go for perfect alignment.
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As I understand it the Sugino XD cranks do have a 42mm chainline with a 103mm BB. I think they are cheaper too. They are 110BCD.
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