Bottom bracket - what size?

[steveslow]

Hi Guys

I need a new b/b for my '93 Eldridge Grade, with original LX chainset. Any idea what size I need?

Cheers.

 

[drystonepaul]

What's the M number on the cranks?
If it's M550 it'll be a 122.5mm BB

But it will more likely be one of these two:
If it's M560 it'll be a 113mm or 118mm BB
If it's an M563 with compact rings it'll be a 107 or 113mm BB

The shell width should be 68mm for a Marin.

 

[steveslow]

Thanks! Will have a look on the back of the cranks...