Daft Q- fit XT cranks onto a track frame?

[Hugo Stiglitz]

XT Hollow tech 2 onto a English threaded track frame?

Basically cosmetically worn cranks....single ring to make a rat commuter?

[lufbramatt]

Shimano mountain bike crank spindles are a couple of mm longer than the road spindles (that's why shimano bottom brackets are engraved with "road" or "mountain"), something to do with having to accommodate a chain device or BB mount front mech behind the drive side bottom bracket cup.

Guess it would need either a MTB bottom bracket or some combination of spacers to get the chainline and bearing preload correct.

[wpa1975]

You will need an MTB bottom bracket plus mount the chainring on the inside of the spider to get the chainline correct.

[gazza285]

Stick some spacers in the BB, road/track bikes are 68mm wide, threaded MTB ones are 73mm.

[irc]

Think you need one of these.

https://www.merlincycles.com/shimano-bb52-deore-ho...

I think it comes with 3 x 2.5mm spacers. On a 68mm shell it is 2 on drive side and 1 on NDS.

Though I have fitted cranks with only 1 on drive side and 2 on NDS when I wanted the chain line 2.5mm further left.