Fixed conversion - Crank touches chainstay

[Brian Robinson]

I've just finished a year long project converting an old steel Pinarello to fixed. I took it out for a spin at the weekend and heard a light knocking sound . To my dismay the right crank is skimming the chainstay, particularly under load.

I've got a Miche Primato chainset with track bottom bracket. It didn't even occur to me that there wouldn't be enough clearance (Duh!) as there was only 1 choice for the Miche BB (107mm). However, looking on wiggle at other BBs there appears to be choice of width.

Can I just get a wider BB to resolve the problem? Or is that too simple? Anyone had similar problems?

Cheers.

Brian

[Rob Taylor]

You can adjust the Miche BB and adjust how far it sticks out each side by adjusting how far you screw in the cups on each side - this is the beauty of this BB - so you can get a perfect chain line.

chain line is something you might want to check if your crank is catching the chainstay as well - sounds like it might be out of the cranks are catching - what length cranks are they? and is the chain ring almost catching?
not sure about a different BB - but make sure you get one with a compatible taper

[Brian Robinson]

Thanks Rob.

I didn't realise there was flexibility with the BB, I didn't fit it myself due to the need for re-thread of BB. When I was riding (only went 100 yds) the chain did sound a bit odd which may tie in with the chain alignment issue you mention.

Brian