what size sand tires?

[Big Red Menace]

My son rides a stock 250 rappy, and I'm taking him on his first dune trip with the guys. What size rear paddles are people running on these? Because of the amount of power and the fact that the stock tires are 19's I'm tempted to put 18's on instead of the 20's that I run.

[Big Red Menace]

I know people are riding these in the sand dunes. What combo's are working good?

[mxkids]

you better put smaller than an 18 the stock 250 only has 17 hp with an 8500 rev limit

[Big Red Menace]

I doubt that there's smaller than 18" rears out there. Even if there is, as soon as it spun a little it would be hung up.
There's got to be someone out there with some real world experience.