Derbi GPR 50 R >1997 Z-52 pitch 420 IGM

IGM quality crown gears.
The gear ratios in mopeds are very important to get the most out of the engine. A too long gear ratio can lead you not to use all the power of the engine, and with a too short one the same, normally you have to follow some guidelines to choose them.
In the case of the crown gear is totally different, if it has more teeth it means a shorter gear ratio (more RPM) on the other hand if it has less teeth it means longer (more top speed)

Valid for the following models:

Motorhispania
- 50 RX 05-09
Peugeot
- 50 XR6 02-06
Aprilia
- 50 RS 06-09
- 50 RS 10-13
- 50 RS4 12-16
- 50 RS4 Replica 12-16
- 50 SX 12-16
Derbi
- 50 GPR Racing 04-05
- 50 GPR Racing 06-13
- 50 GPR Nude 04-05
- 50 GPR Nude 06-13
- 50 Senda SM DRD Racing 11-16
- 50 Senda SM DRD Racing Limited 07
- 50 Senda SM DRD Evo 09-10
- 50 Senda SM DRD Evo Ltd. Ed. 10
Gilera
- 50 SMT 11-16