I’m gathering information for a custom 650B Low Trail with 650Bx42 tires and fenders.
Are Bottom Brackets and Fork Crowns readily obtainable for 650B x 42 mm wide tires?
Do the BB have the correct angles for the chain stay clearance or is a special bending of the stays required to achieve tire clearance?
#1 A 2009 video with Boulder Bicycles Mike Kone mentions typical BB do not have the correct chain stay angle for good tire clearances with 650Bx42 tires. Kone mentions they build their own BBs. May be the supply situation has changed since then.
#2 Same 2009 video mentions fork crowns are not wide enough for 42 mm tires and fenders. Again, may be the supply situation has changed.