Looking at buying a second-hand fat bike. It is currently 1×10 but I would like 2×10. Would I need a fat bike specific front mech and chainset or would any fit?

what frame is it?

If it’s able to run a mech than it’ll run a ‘standard’ one. The trick is knowing which standard 😉

You’ll need a Fat Bike chainset as they run 100mm BB shells.

There is usually a frame-specific block or extender that moves the (standard) mech outwards so it lines up with the rings

As above, my Wazoo has a block that spaces the mech out from the seat tube. I’m not convinced the mech is entirely normal though as it does have slots to line up into the spacer block.

I’m not convinced the mech is entirely normal though as it does have slots to line up into the spacer block.

all direct mount mechs have this.

If it needs one with a special block to move the whole thing outboard, i have a mech and the block, unused, for sale… pm me