A: This would fit but is slightly narrower than the recommended rear tire size for the TRX90. That model is supposed to use a 19x8x8 sized rear tire. The tires available in the stock sizing are very limited though unfortunately. What a lot of people will do with this model is run an 18x9.5x8 tire. You don't want to go to a larger size tire such as a 20" as it will rob too much power. If you would like to give us a call, we can help with the different sizing and options available to get you taken care of.