TT2775 12.3mm Black Rotor for the GEN4 series motors.
This rotor is the standard size for SPEC-R Series motors:
21.5T GEN4 SPEC-R
17.5T GEN4 SPEC-R
13.5T GEN4 SPEC-R
10.5T GEN4 SPEC-R
6.5T GEN4 SPEC-R
Fits ALL GEN4 Modified, SPEC-R and Eliminator series motors.
