I have an older bike Giant OCR, that has Ultegra crank FC-6500 and the BB-6500. So, I thought it would probably be a good idea to replace the bottom bracket, but when I look to replace it, it appears that the BB-6500 are almost non existent.
Does anyone know of a way to see what bottom brackets would fit the cranks and the bike I have?
If anyone knows of a good source to get these that aren't outrageous cost, it would be appreciated. (I saw one on fleabay, so hopefully, that one works out. Says new never installed. but would prefer a new from a store.)
'''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Octalink road bottom brackets (V1 that fit 105, Ultegra and Dura Ace cranks) only came in 109.5 and 118.5 spindle lengths and in English threading requiring a 68 mm bottom bracket shell width and Italian threading that requires a 70 mm bottom bracket width. Your Giant is English threaded with nearly 100% certainly.
A 73 mm bottom bracket shell is an MTB width. It uses English threads but a wider shell and is not used on road bikes.