[chrisguyw]

Silly question, do urethanes come in different wear rates?

Paul Gage urethanes do come in various shore ratings (which will affect wear) .........they are the only one (I believe) to offer various compounds within a specific tyre size.

The ratings within the the major suppliers of urethanes ....Yellowdog, Paul Gage, Ortmann, Dart, KK etc. are also somewhat different, with each having slightly different grip/wear characteristics. 

Other than the Paul Gage "XPG",.......you should be completely fine regarding wear rates for any urethanes, for most all proxies.

Cheers
Chris Walker