in order to run a steel spur you need a hardened clutchbell.....the spur is not designed to fail at all..thats false information.....the slipper clutch is designed to absorb the big shocks to the drivetrain....not a melting spurgear. I run steel in both Tmaxxs and have never had an issue at all......always set your mesh correctly and make sure your slipper is adjusted properly and you will never have a problem with plastic...until a small pebble or something jams in between it and clutchbell and then the spurgear will break teeth or melt....thats the advantage of running steel.