HPI Racing 87064 Differential Ring 13.8x21mm D-Cut (4pcs) Cup Racer 1M

HPI Racing 87064 Differential Ring 13.8x21mm D-Cut (4pcs) Cup Racer 1M

This is a genuine HPI Racing pack of D-cut differential rings in 13.8x21mm size, supplied as a set of 4 for the Cup Racer 1M. Diff rings are core components of the differential, and their surface condition directly affects diff smoothness.

Fresh rings during a rebuild restore silky, consistent differential action. Each ring matches the factory originals exactly.

• Genuine HPI Racing replacement part #87064
• Differential rings, 13.8x21mm, D-cut
• Pack of 4
• Fits the HPI Cup Racer 1M
• Restores smooth differential action