Spur Gear:

Transmission:

FDR:

Your pinion should be: 51

Common Transmission Ratios
Cyclone S	2.4375
Cyclone TC	2.16
Associated TC3	2.5
Corally C4	1.88
Xray T1	2.125
HPI RS4	2.13
Losi XXX-S	1.83
Want another car here, email me at jceci @ sixfoottiger . com (without the spaces)

• Find Pinion for FDR
• Calculate FDR