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OK, is that good news or bad news? :) Sorry I know nothing of Shimano and JIS
Its surely not going to be as easy as letting me use a Shimano BBUN55 is it, that would be great but seems too easy and simple. If yes from what I can see they come in axle lengths of 107mm, 110, 113, 115, 118 so maybe one of those?.
Edit, hmm all the Shimano BB's I see are BSA threaded but the frame I want to fit this Starfish to is a late 80's Italian bike with Italian threaded BB and a 68 shell width, so I seem like I'm trying to cross streams again, is there any Italian threaded square taper JIS BB's with a 68 shell width?
@MCamb I did wonder about that, maybe a new one will be too fat but a more used chainring will be worn to fit :)....thanks, to be honest I can fiddle with chains, its the BB I'm more worried about at this point.
user75204-
any Italian threaded square taper JIS BB's with a 68 shell width?
Sounds like someone has been overzealous with the facer.
As @LWaB suggests, full size Italian bb with a spacer. Shimano unXX should be available in Italian threading.
As for the chainrings, I can't see why there would be a limit on the tooth count of the smaller ring. It looks like they use a threaded insert and a spacer between the inner and outer rings, but you should have all that present on your current set up.
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I have an Italian UN 72 107mm if you wanna give it a go.
It is brand new before it fitted for a test on a frame.
Did not clear a double OLMO from the 80s with Shimano 600 which was run single speed.
113mm made it work with the ring on the outer so I guess you'll need a 115.
Stronglight makes JIS Italian BB still so shop around for it, would have offered one but I'm leaving mech life at the end of the week.
M_V
coventry_eagle
I thought Mavic BBs were JIS.