Originally Posted by
dddd
I've replaced many 740x bottom brackets with various UN-series 107, 110 and 113mm cartridges, and it was always a beneficient move.
The shortest 740x road double spindles were 112mm, at a time when 600/Ultegra bb's were 113mm for 68mm bb shells.
Earlier 7xx(?) Dura-Ace bb's from the AX era had 109mm bb spindles iir, different animal.
My current Centurion carbon rig uses a RaceFace JIS 113mm symmetrical cartridge with 7402 crankarms, and all is well despite the fact this bike's chainstays have no clearance crimps at all.
Thanks for the info. I'm thinking a 113mm will work for my bike. It has fatter chain stays (Aluminum) but has clearance dimples. Nice lugged carbon bike by the way!