Will they fit?

http://www.bikebandit.com/michelin-t63-motorcycle-tire

I have searched and can't find if anyone has tried this tire on the X?

My dad and brother use them on their KLX250's and love them great for on and off road without compromising much performance in either category... but they have dirt wheels.

I'm using Shinko 244's but they suck for anything that's even just slightly wet when off road. My front tire still has plenty of tread so i was thinking about just replacing the back with this Michelin t63.

What do you y'all think?

I don't have any experience with these on a WR but when looking for tires for my DR650 everyone I knew said go with the Conti. TKC80 over the Michelin T63 and that was based on their experience with the T63 and the TKC's.  I do not know this for a fact, but they indicated that they were not Michelin quality.  The TKC's were awesome offroad and decent on the road.  The problem was I got less then 2K miles on the rear.  Hopefully some other riders can give you some first hand experience.  If it was my WR250X, I would try and keep the same front and rear tire brand and model tire.

That TKC80 looks like a nice tire but its double the price :(

yes I know you are right about cost but I personally feel that tires and helmets are so important. I can't really afford the more expensive tires but usually end up with them.

The Michelin T63 rear and Pirelli MT21 front make an awsesome combination.