Any way to get a 10speed Mtb wheelto fit a junior road frame

mattrixdesign2 Posts: 644
edited June 2015 in Workshop
Building my lad a bike up. Road frame, using some existing road parts. The road frame is for 26in wheels, I have a pair of XT-alex 10sp mtb wheels. The front fits perfectly, rear has the wrong spacing (too wide). Can the internal part of the hub be swapped, spacers removed etc? The cassette with be 8speed Claris.

Whilst on the road bike mtb parts subject. Will a 8speed Claris shifter be compatible with a 10sp Xt mech on an 8sp casette?