Originally Posted by
SquidPuppet
Sit down for this one. Ready? The Shimano UN55 spindle (in the 110 size) is offset toward the NDS by about 3.5mms. Which positions the Drive Side spindle to LESS THAN where a symmetrical "104mm" BB would place it.
A symmetrical 110mm BB might actually work for you. MIGHT.
Code:
Bottom Bracket/Spec Actual NDS DS Symmetrical?
Sugino/Tange 68-103 103mm 17mm 18mm Y (+1mm on DS)
Shimano UN54 68-107 108 20 20 Y
Shimano UN54 68-110 111.5 23.5 20 N (+3.5mm on NDS)
Shimano UN54 68-113 114 23.5 22.5 Y (+1mm on NDS)
Shimano UN54 68-115 115.5 24 23.5 Y (+0.5mm on NDS)
Shimano UN54 68-118 118.5 25.5 25 Y (+0.5mm on NDS)
Shimano UN54 68-122 123 27 28 Y (+1mm on DS)
Shimano UN54 68-127 128 30 30 Y
Correction: The Shimano 110mm BB still places the DS crankarm a few mm farther out than a symmetrical 103/104 would, but not by much. I'd go straight for a 113mm on this bike and see how things look.
