Self-build - help with choosing a chain set/BB needed

[drissa]

I'm making progress with a self-build project (on paper, at least), but I'm stuck with this element. I'm building a Nexus 8 wheel and putting it in an old Dawes frame. The only details I have to go on are the Nexus chain line (42.7mm I gather) and the fact that my frame has an English thread BB.

I know that Shimano have a chain set designed for the Nexus, but do I have other options? I assume a similar single chain set would work? But I'm not sure where to start with BB selection to ensure a good chain-line with the Nexus (especially given that this frame was never expecting this kind of thing). Is it just trial and error? Are there any standards I can work with? I'm reading lots and slowly teaching myself, but can't see much info on this area and would appreciate any pointers.

Thanks

 

[vernon]

Try Sheldon Brown's web site here: http://sheldonbrown.com/bbsize.html#chainline

 

[drissa]

Thanks Vernon, fellow SG admirer...

From what I can gather, it's all a bit hit and miss - grab a BB, try it out. I'll take my chances.

 

[jazzkat]

I beleive chainset makers will specify a bb length to give you a standard chain line (as per Vernons link)
There will always be a bit of leeway, but you can get shims/spacers to tweak the spacing a little.
Mixing and matching? sounds like a nightmare to me, but might be the way to get a real custom fit.
Good luck!

 

[simon.r]

I used a triple chainset with a Nexus hub. Mounted the chain ring in the middle position and shimmed it to get the right chainline.

 

[drissa]

Thanks folks.