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@danDNA
Hi
I have jst stripped down the Martrac track bike i bought off ebay last week for a respray and have found that I need a new bottom bracket for it and need some advice.
The current bottom bracket is an unbranded, loose bearing job in pretty bad condition.
It is english thread, 117mm spindle and fits a 68m shell.
What i need help with is working out if the cranks are ISO or JIS taper - I am assuming they are ISO as they are made by Stronglight. They are an old style with a single fixed chainring that is not removable. Is this a good assumption to make? Have Stronglight ever made cranks with JIS thread?
Assuming ISO is the way to go can anyone advice on who makes an ISO taper 117mm engligh thread BB? I have been all over google and can find nothing in 117mm width at all. Stronglight do the JP400 BB but I think that may be a JIS thread and I cant even find that in 117mm.
Any advice would be appreciated as I don't really want to have to buy a new crankset just because I cant get a BB for the one I have!
Cheers.