Advice on BB Spec for 1992 Stumpjumper Comp

[Repacker]

I'm building up a 1992 Stumpjumper Comp, the Pink one, and was hoping someone might be kind enough to give me a steer on the BB spec before I have to study first principles at sheldonbrown.com.

I have an original 3*7 Shimano XT M730 crankset, with 46/36/24 110/74 bcd chainrings.

The frame BB Shell measures 73mm. Since I was advised that the previous BB extracted from this frame before I owned it was 68*122.5, I wanted to double check with anyone here who might know or advise what I should really go for.

Presumably (obviously?) I should be using a 73mm BB, but the prior info on the 68mm BB makes me question the 122.5 width advised too.

Any input or advice much appreciated.

Regards,

Andrew

 

[firedfromthecircus]

As is often the case, Sheldon is your friend!

https://www.sheldonbrown.com/bbsize.html

 

[Repacker]

Thanks!

For any future reference that shows the following for this combo -

Deore XT M730

Triple

122.5

Square

110/74

1990-1993

 

[Cactus459]

Presumably (obviously?) I should be using a 73mm BB, but the prior info on the 68mm BB makes me question the 122.5 width advised too.

I have the 92' yellow standard Stumpjumper and measured it at 73x118 (UN51)
The drive train is full DX 3x7.