Rear rotor questions yfz450 trx250r

[Harpo]

I have a couple of extra rear rotors laying around and I am unsure of exactly what they are off of. What is the difference or bolt pattern between a 04-05 yfz450, 06-08 yfz450, and a 92-01 Trx250R rear rotor?

[deathman53]

a 92-01 trx250r???I never knew such a thing was ever made. I can tell you, that 04-11 trx450r and 85-89 250r rotors will bolt-on, but the rotor diameter is not right.