You are reading a single comment by @niggle and its replies.
Click here to read the full conversation.
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
@niggle
Building an old early 90s Specialized Hardrock up with a Sturmey 3 speed hub, have one of the budget Stronglight ST55 chain sets to fit. BB shell is 73mm wide. I first tried a 107mm UN55 BB but the chainring (38t) was touching the chainstay. I have just tried a 113mm UN55 and the chainring now has decent clearance, but the left crank just bottomed out on the left cup when tightened down. I looked for a 115mm UN55 for 73mm shell but can't find one, only 118mm which seems a bit of a jump and anyway not sure if it will actually give any more width on the left. The UN55s have an outer lip on the left cup but some other BB designs don't have this so wondered if e.g. a Tange 73/113mm I have seen for sensible cost might work and if so is it of similar quality? One good thing about the SA 3 speed hub is the wide range of chainlines that can be accommodated....
EDIT: SA chainline range 36-48mm. Chainline of ST55 with 113mm BB 44.5mm