Hi - running older Shimano 8 speed on the cross bike. looking to use an early 1990's Shimano 600 square taper crank on a UN-73 BB (all 68/English). On Sheldon's website, it lists the later Ultegra 8 crank and the 600 together and has 113 with 115 in parentheses as the widths. The way the info is set up, it left me a little confused as to which BB matches which crank, if either is acceptable, or if there is any difference at all, other than labeling, between the 600 and the later Ulterga 8 cranks. Or does 2 mm even matter ? Any guidance appreciated.
Hi - running older Shimano 8 speed on the cross bike. looking to use an early 1990's Shimano 600 square taper crank on a UN-73 BB (all 68/English). On Sheldon's website, it lists the later Ultegra 8 crank and the 600 together and has 113 with 115 in parentheses as the widths. The way the info is set up, it left me a little confused as to which BB matches which crank, if either is acceptable, or if there is any difference at all, other than labeling, between the 600 and the later Ulterga 8 cranks. Or does 2 mm even matter ? Any guidance appreciated.
Lou D'Amelio
IIRC, the 113mm refers to the loose ball BB, and the 115 refers to the cartridge bb. Shimano 600 came out before the cassette BBs were released.
Hi - running older Shimano 8 speed on the cross bike. looking to use an early 1990's Shimano 600 square taper crank on a UN-73 BB (all 68/English). On Sheldon's website, it lists the later Ultegra 8 crank and the 600 together and has 113 with 115 in parentheses as the widths. The way the info is set up, it left me a little confused as to which BB matches which crank, if either is acceptable, or if there is any difference at all, other than labeling, between the 600 and the later Ulterga 8 cranks. Or does 2 mm even matter ? Any guidance appreciated.
IRRC, it's a chainline issue. 113mm was from the 7SP (126mm OLD) era. 115mm is from the 8SP (130mm OLD) era. So, for you, 115mm is likely better, but no, 2mm isn't a big deal.
Hi - running older Shimano 8 speed on the cross bike. looking to use an early 1990's Shimano 600 square taper crank on a UN-73 BB (all 68/English). On Sheldon's website, it lists the later Ultegra 8 crank and the 600 together and has 113 with 115 in parentheses as the widths. The way the info is set up, it left me a little confused as to which BB matches which crank, if either is acceptable, or if there is any difference at all, other than labeling, between the 600 and the later Ulterga 8 cranks. Or does 2 mm even matter ? Any guidance appreciated.
Lou D'Amelio
113mm for english, 115mm for the far suprior Italian threading...BUT 115mm for english will be fine as well. For some cross bikes, with fat chainstays, you 'may' have a chainring clearance problem with 115mm..then use a 118 or 122mm.
