High precision spar gear that can be installed on touring cars of various companies. Excellent gear accuracy. Our spar gear is very good for the precision of the gear. In particular, the precision of the tooth thickness is important, and when the dimension is added to the positive (larger than the standard value) and pinion are interlocked with noise and greatly decreased driving efficiency. Our spar gear teeth thickness is an efficient negative eye that is extremely quiet and drive efficient. In addition, film gate molding has been adopted to achieve a high degree of roundness. Compatible with pin fasteners, screw fasteners, and deflation balls. There are slight protrusions on the mounting hole, so you can install the spar gear without rattling to any 0.1 inch (3 mm) pin type vehicle. (4 holes inside the 12 inner holes are optimized for 3mm pins. It can also be installed without any rattling to the Tamiya TRF417. This hole can hold 1/8 size deflation balls (12 total). It can also be used as a default gear for DD cars. The slight ridges also help prevent deflation.
(From Amazon.co.jp)