I got 22x10x9 rear tires(stock tires) on my 87' trx 250x. I want to put some holeshots on the rears because they are starting to get bald. Will 18x10x9 or 19x10x9 for MXR4's be good or the 20x11x9s for the XCR's fit on my rim? I ride trails, so I need some tires with tread.

 

The 20s should fit.

 

all those tires you said would fit on your stock rims fine...if you ride trails alot than dont get the 19" MXR4's and no way do you want to get the 18" razr...id go with either the holeshot XCR's or the holeshot HD's...those are both great tires for trail riding...