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New Bottom Bracket

Old 05-21-20, 12:58 PM
  #1  
BenGeldreich
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New Bottom Bracket

Hey everyone!

Excuse any ignorance in this posts. I'm trying to sort out how narrow of a BB I can or should install for my bike rebuild. I'm unclear how to sort out chain line and Q factor without actually installing a bottom bracket, crank, cassette, chain and dialling in the shifters. I've read a few articles on both Q-factor and chain line so I do understand the principals behind them, however without installing everything in my new setup I'm unclear how to determine what would be optimal.

That said I did temporarily install my old 110 BB to see if the new VO crank arms would clear my chain stays. There is plenty of room and seeing that and reading an article in BQ about filing down the crank arm ends to make more room to get a narrower Q-factor, made me think that maybe a 107 would be a better BB for my new setup. Are there any other areas besides the crank arms and chain stays that I need to look at for clearance or something else to consider before installing a narrower BB, like toe overlap?

My old setup: Worked Fine!
  • 8 speed,
  • Compact crank (50/34),
  • 11-32 cassette,
  • STI shifters,
  • 8 speed chain,
  • 8 speed front derailleur,
  • 8 speed medium cage rear derailleur,
  • and a 110 BB.

My new setup:
  • 10 speed,
  • Velo Orange 50.4 crank (46/30),
  • 11-34 10 speed Shimano cassette,
  • RIV down tube friction shifters,
  • Deore XT RD-M739 rear derailleur 8 speed long cage (I have a few other options here),
  • not 100% sure what FD to get yet,
  • and leaning towards an IRD Defiant bottom bracket.

Thanks Everyone! Enjoy the day!
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Old 05-21-20, 01:36 PM
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Bill Kapaun
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Rings
Recommended is 118mm-
https://velo-orange.com/products/gra...-crankset-mkii
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Old 05-21-20, 01:47 PM
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Originally Posted by Bill Kapaun View Post
Hard to beat a manufacturer's recommendation/specification. Time for another BB!
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Old 05-21-20, 02:03 PM
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Hard to beat shimano. https://www.performancebike.com/shim...n55b18/p308340

You can try the current BB and if you are happy with keep it. I have never been afraid to mix and match.
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Old 05-21-20, 03:08 PM
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You might look into the Shimano FD-CX70 it should work well with that crankset.
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Old 05-21-20, 04:50 PM
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Originally Posted by davidad View Post
Hard to beat shimano. https://www.performancebike.com/shim...n55b18/p308340
You can try the current BB and if you are happy with keep it. I have never been afraid to mix and match.
I know that VO recommends 118, however before I purchased it I did talk to someone at VO who did say to give it a try with a 110, it may work. I think I'll play around with my current 110 and see how it performs once everything is set up. That should give me enough info on what to change and or what size of BB to order.

Originally Posted by dsbrantjr View Post
You might look into the Shimano FD-CX70 it should work well with that crankset.
Thanks a lot for the front derailleur recommendation. I haven't done a lot of research into what front derailleurs would work best with my setup yet, so this is a great starting point. Appreciate it.
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Old 05-21-20, 06:41 PM
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If the rings don't rub the chain stay, your FDER still "might" not travel in far enough.
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Old 05-21-20, 09:12 PM
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Originally Posted by Bill Kapaun View Post
If the rings don't rub the chain stay, your FDER still "might" not travel in far enough.
Thanks Bill! The rings don't rub the chain stay and neither do the crank arms so I'm ok there. But I do agree, I think my problem may come with the FDER and like you said, finding one that travels our far enough. My thought right now is to use a triple FDER with the hopes that it will have enough travel. I've chosen to use friction shifters as I imagine that will also help when mixing and matching parts.
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Old 05-21-20, 10:07 PM
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Going to a shorter spindle moves the rings IN.
The FDER has to be able to travel far enough IN.
Sometimes backing the L screw all the way out isn't enough because the cage physically won't move far enough.
Since you have the 110mm BB, test with that to see if it'll go in another 3?mm further.
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Old 05-22-20, 10:41 AM
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Originally Posted by Bill Kapaun View Post
Going to a shorter spindle moves the rings IN.
The FDER has to be able to travel far enough IN.
Sometimes backing the L screw all the way out isn't enough because the cage physically won't move far enough.
Since you have the 110mm BB, test with that to see if it'll go in another 3?mm further.
Thanks Bill! That's exactly the guidance I needed. I'll set it up and see what kind of movement my current FD gives me.
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