Another BB question...
Hello... newbie here... I'm upgrading my vintage Vitus Cilo (1989) with a new-old-stock bottom bracket. Currently, it has a Specialized bb w/ Italian threading 36 x 24F, 70mm hub width, 110mm (I think) spindle length. I want to replace it with a Shimano UN10, 36 x 24T, 70mm hub, 115mm spindle to ease up on the chain angle when using high gear (39 chainring - 13t sprocket 7-speed and 130mm hub spacing from previous 126mm)... Firstly, is the threading 24F and 24T the same? Secondly, is 115mm spindle length too much. Thank you in advance...
The threading should be the same. Chainline - guessing here that you will kick your chainline out 3-4mm, just don't know the symmetry of the Specialized vs. Shimano to give you a precise answer.