will a 19" wheel fit a 1991 kdx 250?

As far as I know you can use a 19" wheel. The difference is is the width of the sidewall. The 18" wheel is better suited for trail riding because it can better absorb rocks and whatnot and avoid pinch-flats. The 19" should work fine..

I wish I knew what KX wheels were compatibile to give you a better idea what to look for. I've often thought of going w/ a 19", but after riding out here in the desert and taking some pretty good hits on my rim, I've thought better of it. Too many times I've hit rocks and instantly thought "uh-oh, flat..." but it never materialized. I'm sure if I was running a 19 it would be. But, for a paddle tire a 19 should be fine.

As said before, I have no factual basis for my opinion.... it's just an opinion.

Now THAT'S wishful thinking! :rotfl:

rickwenham said:

this weekend i will take the rim off of my dad's 426f and see if it will go onto my bike...hopefully there aren't any other issues with fiment (rotor, hub size)....

I don't even know if the axles are all the same size or if they can vary...

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Wishful thinking for sure. The chances of an axle, rim, hub from a Yamaha fitting on your KDX are pretty slim. You will most likely find a match from a similar year KX.

I could be wrong about the YZ to KDX, but then again, monkeys may fly out of my butt. :laugh: