Robinson racing pinions 48p metric
http://cgi.ebay.com/Robinson-Racing-...item563b5224d2
These are supposed to be steel alloy but i find they only last a little longer than the aluminum tamiya ones.
The plastic spur in my mt-10 seems to be very hard and wears out pinions quickly.
or tamiya av pinions,
http://cgi.ebay.com/Tamiya-50354-RC-...item1e5b47f1b5