Joined: Feb 2006
Posts: 571
Likes: 0
From: Canberra, Australia
Bikes: Salsa mtb * 3, Intense mtb * 1, Abeni SS rd * 1, Salsa road/touring * 2, Trek Damn one * 1, Vintage/projects * many
The Shimano outboard BBs all have the same dimensions, unless you get an MTB cupset instead. They have a 90mm external width when installed on a 68mm shell. I don't think there's much difference between the 105 and Ultegra bearings.
- Joel