J
James Thomson
Guest
I have a pair of Stronglight 49D cranks that I'd like to use with a single
3mm (1/8") TA chainring to drive a Fichtel & Sachs Torpedo hub (~40mm
chainline) and I'm looking for a suitable bottom bracket.
The cranks were bought in different places at different times. The left
(stamped F and 9 near the taper) was originally French threaded (I've
retapped it to BSC), and the right (A and 4) British. It seems that the
tapers are slightly different: the right crank comes close to bottoming on a
Campag axle and seems a good fit on a Shimano UN71, while the left crank
seems happier with the Campag taper. The right taper doesn't look worn.
This needs to fit an old French "porteur" bike, with French threaded bottom
bracket shell.
I don't currently own a Stronglight crank extractor, so I'd like to get this
right first time if possible.
Can anyone tell me what the original Stronglight spec would have been for a
bottom bracket for track or hub gear use?
Can anyone make a stab at a reasonable modern alternative for a French
threaded frame? I have some Spidel cups that will work with 30mm cartridge
bearings or a UN72.
Thanks,
James Thomson
3mm (1/8") TA chainring to drive a Fichtel & Sachs Torpedo hub (~40mm
chainline) and I'm looking for a suitable bottom bracket.
The cranks were bought in different places at different times. The left
(stamped F and 9 near the taper) was originally French threaded (I've
retapped it to BSC), and the right (A and 4) British. It seems that the
tapers are slightly different: the right crank comes close to bottoming on a
Campag axle and seems a good fit on a Shimano UN71, while the left crank
seems happier with the Campag taper. The right taper doesn't look worn.
This needs to fit an old French "porteur" bike, with French threaded bottom
bracket shell.
I don't currently own a Stronglight crank extractor, so I'd like to get this
right first time if possible.
Can anyone tell me what the original Stronglight spec would have been for a
bottom bracket for track or hub gear use?
Can anyone make a stab at a reasonable modern alternative for a French
threaded frame? I have some Spidel cups that will work with 30mm cartridge
bearings or a UN72.
Thanks,
James Thomson