Some French 650b bikes especially tandems had lugged BBs with widely angled ports so that curved chainstays could be used to bring a big tyre and mudguard in tight and allow short chainstays with no dimples. I've seen a pic somewhere (Bicycle Quarterly probably) which shows a rear triangle without the wheel it's pretty cool.
Some French 650b bikes especially tandems had lugged BBs with widely angled ports so that curved chainstays could be used to bring a big tyre and mudguard in tight and allow short chainstays with no dimples. I've seen a pic somewhere (Bicycle Quarterly probably) which shows a rear triangle without the wheel it's pretty cool.