Tri-hub Wheel Diameter?

[Mills]

I have a '14 Viper and still use the tri-hub rear tensioning wheel assembly because I modified it to be able to service the bearings. I purchased two used tri-hub wheel assemblies at Hay Days last year to make a spare for myself and a buddy. I just noticed that one is a larger diameter than the other. What diameter is the wheel assembly for a '14 Viper and what year/model may have used the larger diameter wheel assembly? Is the larger one possibly from a Cat and not a Yamaha?

 

[twyztid]

LTX 137 models use 8" rear wheels. I think the RTX 129" models use smaller wheels (maybe 7.5"?). I am not sure about the XTX.

 

[DennyTuna]

LTX 137 models use 8" rear wheels. I think the RTX 129" models use smaller wheels (maybe 7.5"?)

Correct