Thread: Having a hard time figuring out what bottom bracket I need
View Single Post
Old 05-10-20 | 03:06 PM
  #15  
ThermionicScott's Avatar
ThermionicScott
Senior Member
10 Anniversary
 
Joined: Aug 2011
Posts: 22,676
Likes: 2,643
From: CID

Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers), All-City Space Horse (hers)

I have a couple of bikes with that weird English-threaded 70mm bottom bracket shell. A 68mm cartridge bottom bracket can be used as long as the left-side cup doesn't have a lip/ledge on it. That lets the left-side cup keep threading into the shell until it can mate up with the cartridge unit. You'll have to plan on the crank sitting 1mm further to the right than if you had a 68mm shell.

Here's what it looks like from the left side when it's all back together:
ThermionicScott is offline  
Reply
1