Any body actually have experience of putting a 29 inch fork and front wheel on a 26 inch mtb

which fork, what length is it?

Don’t do it.
Run a big wheel in a 26in fork, by all means, but not a 29in fork and wheel in a 26in bike.

‘cough’so what about that 456 with a 29er Reba/wheel in the dirt test then?!

have done it to an old (2003)hummer using a rigid carbon 26″ fork and it works for me a a lightweight ss.

I banged a 29er wheel in the front end of my Genesis io (rigid fork adjusted for 80mm travel fork) slackens the HA by a degree ish but works well for me and my style.

I posted an identical thread a few days ago.

http://www.singletrackworld.com/forum/topic/diy-96er

Works well on a short (~445mm) rigid fork for some frames with relatively steep head angles, if you want a suspension fork forgetaboutit.

Do it!

Works brilliantly on my Wanga.