Did you know there were high traction tires available for the MPV-7100?
They are the same height but a little wider. If you have problems going up your slopes of spend too much time out in the timber slipping around these will give you a lot better traction!
Contact Raven America for pricing.
Now if we could just get the lawn tractor manufactures to switch to this size rim! 
Traction Tires for Raven MPV-7100
