Can anybody tell me were i can buy a rear 700c wheel with a 135mm rear hub please?thank you

I thought that was standard now.

are they? i would like to put a pair of 700c wheels into an mtb frame a run cyclocross tyers with them got to be disk?

Most 29er rear wheels are 700c / 135mm

29er wheels = 700c

no its got to replace a 26inch mtb wheel

no its got to replace a 26inch mtb wheel

As above, 29er wheel (same/similar diameter as road 700c)
Alternatively, go for a hope road hoop and spec a longer axle, or go for a cheapy commuter bike wheel.

As above – 29er wheels are 700c and will replace 26″ mtb wheels but you will have to use a thinner tyre (probably)

I have 29er wheels on my lavadome with 40mm tyres on it and discs and no problems.

Cotic do one that may be a little less beefy than a 29er wheel

APF

beaten too it by dog slow ‘puter updating

ok if i buy a 29er rear wheel then will it just drop right in no fuss,i need to run a 700c cyclocross tyer?

drop right in no fuss

Prob need to recenter brake caliper

running disks

You’ll probably need to recenter the brake caliper.

Proper handbuilt set, any MTB hub should go onto any road rim, number of holes permiting.

over on road cc there was (about 3 weeks ago?) a review of a kinesis wheel set for cx with 135mm rear – cos the pro6 disk is 135mm rear

potential problem with a lot of off the shelf 29er wheels is that rims aren’t designed to take narrower tyres – but i’m sure people do

It will fit assuming your 26″ MTB has room for it. Check with a measuring stick.
Typical issue arising from some dimwit giving a new name to an old standard.