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What is the largest rear wheel size you can fit on a 94' 200? I do alot of street riding and am getting close to needing new tires. and i want a fatter rear wheel.

You might be better off going to a dual purpose tire like a pirelli scorpion or Kenda Big Block or conti twinduro. Sounds like you put more road miles on than dirt and knobs don't like pavement. I have seen guys running 120/100-18 knobbies, supermoto I have seen 160's (albeit in a 17"). maybe a bigblock in 140/80-18. Not sure why a fatter wheel is the desire since you're not likely knee dragging your KDX, and if you are you're on the wrong bike lol.

When I bought my 220 she came with an IRC 140/80. The bike looks mean but as a fact the 120 tire perform way better in the trails because the bike get on the pipe faster.

If you're going with 17s then here's some good dual sport tires you might consider.

Front: http://www.ebay.com/itm/120-70HR17-Avon ... 76&vxp=mtr
Rear: http://www.ebay.com/itm/331064606649?ss ... 1438.l2649
Or a cheaper harder compound alternative for the rear: http://www.ebay.com/itm/190882974090?ss ... 1438.l2649

These will be my next set for my SMR here in the next couple months and I'll probably go with the shinko rear.

Those Shinko 705's are the cats azz! I'm a KLR 650 guy and I know plenty of KLR guys and gals that use those tires. They do great on pavment and on gravel too!

The Kenda K270 is a really good dual sport tire also and comes in plenty of sizes too.

Yeah that's what I've heard and good for 10k+ miles on a light bike like these. If they had a 120/70-17 I might consider getting one for the front as well but I like the idea of having a little bit stickier distanzia in the front so I guess I'm OK with paying more for it.