new bottom backet
Hi! I have a Surly LHT. In the specs, all it say is that the BB is Shimano BSA. It is a Sora group on the bike.
I want to use an Orange Velo triple on the bike, but it tells me to pick a spindle length, while suggesting 124mm is appropriate fo most bikes.
What do I measure, and how, to determine the spindle length I need?