kbajaj
Well-Known Member
So I started a an old road bike restoration project while this crazy snow/ice is keeping me away from the trails.
The frame is an old (likely late 80s early 90s) Specialized Allez - carbon fiber tubes with aluminum lugs. Its got Shimano 105 rim brakes, Campagnolo Athena rear hub and Campagnolo 8 speed cassette paired to a Shimano RX100 RD. The rear Brifter is 7 speed and front is 3 speed. The crankset is a 3 piece square taper Propulsion 8 with pedals stuck in it (probably corrosion welded) with front derailleur being Shimano Deore XT. So a lot of mix and match going on here but this all worked together nicely before I decided to take it all apart to paint the frame.
When I took the BB out, some rubber seals fell out crumbled and a couple of ball bearings also fell out so pretty sure I can't reuse it. I can't figure out the type of replacement BB to order.
Here's what I know:
The BB (photo 1) says Shimano BC 1.37 on it
The shell width I measured is about 68.4 mm (one side of the BB rings has 70 etched on it - is this shell width?)
The shell dia. I measured is 34 mm
BB is threaded (photo 2 of the shell)
There is a rubbery sleeve inside the shell - not sure if this is a part of the frame and is supposed to stay but it is stuck. Do I rip it out?
From internet research, this could be a BSA threaded.
Can you experts guide me on what BB to order as a replacement to use with the same spindle and crankset? and if I decide to get a new crankset - is there an alternate option for BB and crankset?
The frame is an old (likely late 80s early 90s) Specialized Allez - carbon fiber tubes with aluminum lugs. Its got Shimano 105 rim brakes, Campagnolo Athena rear hub and Campagnolo 8 speed cassette paired to a Shimano RX100 RD. The rear Brifter is 7 speed and front is 3 speed. The crankset is a 3 piece square taper Propulsion 8 with pedals stuck in it (probably corrosion welded) with front derailleur being Shimano Deore XT. So a lot of mix and match going on here but this all worked together nicely before I decided to take it all apart to paint the frame.
When I took the BB out, some rubber seals fell out crumbled and a couple of ball bearings also fell out so pretty sure I can't reuse it. I can't figure out the type of replacement BB to order.
Here's what I know:
The BB (photo 1) says Shimano BC 1.37 on it
The shell width I measured is about 68.4 mm (one side of the BB rings has 70 etched on it - is this shell width?)
The shell dia. I measured is 34 mm
BB is threaded (photo 2 of the shell)
There is a rubbery sleeve inside the shell - not sure if this is a part of the frame and is supposed to stay but it is stuck. Do I rip it out?
From internet research, this could be a BSA threaded.
Can you experts guide me on what BB to order as a replacement to use with the same spindle and crankset? and if I decide to get a new crankset - is there an alternate option for BB and crankset?