I have a Shimano UN-52 bottom bracket and was looking to replace it (starting to grind, ten years old). I ordered a new one and went for a UN-72, but for some reason seemed to have ordered the wrong spindle length.
Using Verniers I measured the two spindles:
New UN-52 spindle length = 107.95mm (I'm guessing it is a 107 mm, since that is a standard length)
Old UN-72 spindle length = 111.3mm
My question is, should I be after a 111 mm spindle? (Do they even make one?) I know they make a 113mm one. I measured carefully, but maybe I was off a bit? But two mm's....that is quite a bit to be off and I don't think I was.
I also checked out Sheldon's database here:
I have a 105 double crankset and the database says I'll need either a 113mm or 107mm. But, that is for an "SC". My cranks are stamped Shimano FC-1056.
I'm confused (and depressed I can't get out riding tomorrow.)
Anyone know what length spindle I need? I know I need a 68mm shell width. Do they make a Shimano UN model (such as 72) in a 68x113? Or a 68x111?