【Compatible with】3.175mm(1/8 inch) Shaft Size Motors,make sure your RC motor shaft have the same diameter.
【Durable】 The RC upgrades pinion gear set are made of quality hardened steel, Durable metal construction for long-lasting performance.
【Instruction】48P is the pitch of each tooth on the pinion gear and the 26T 27T 28T 29T 30T is the number of teeth on the pinion gear. You have to make sure your spur gear and pinion gear have the same pitch, or the teeth won't mesh.
【Gear Combo Set】48p 26T 27T 28T 29T 30T pinion gear, Comes with set screws for each pinion gear, the pinion gear combo set also included a screwdriver, easy to install.
【NOTE】 Firstly, you can begin with the minimum tooth. Then, upgrade to a bigger tooth, and check the ESC & motor temperatures regularly throughout the run. At last, you can control faster speed while avoiding potential risks such as ESC/motor damage or malfunction caused by overheat.