TOP RACING COMPETITION gearbox for mécaboite driving DERBI euro 1, 2, 3 & 4

Ideal on a well-equipped machine with a large powerful kit and the rest of the configuration, the TOP RACING gearbox allows less loss of performance by making better use of the power speeds! It avoids power dips when shifting a gear!

No more too short gear in 6th or first gear! It is perfectly suited to torquey engines as well as to powerful engines at high speeds! Top manufacturing quality! Carved in the best materials with the best machines and workers in portugal. Comes pre-assembled!

Remember that the price is certainly low, but that TOP RACING alias JASIL, is also the manufacturer of many major brands of gearboxes! Avoiding middlemen saves you money.

Gearbox ratio :

1st: 13x32 38.61%

2nd: 14x26 51.35%

3rd: 18x27 63.33%

4th: 20x25 76.00%

5th: 24x26 87.96%

6th: 23x22 100%

Mounts on all DERBI euro 2 and euro 3 and 4 engines, example :

APRILIA: RS 50 dal 2006 -> (DERBI D50B) - RS4 50 (DERBI D50B)
BULTACO: ASTRO 50 - LOBITO 50
DERBI: GPR 50 - GPR 50 Nude - GPR 50 RACING - GPR 50 racing dal 2006-> (DERBI D50B) - SENDA 50 DRD dal 2006-> (DERBI D50B) - SENDA 50 DRD R - SENDA 50 DRD SM - SENDA 50 EXTREME - SENDA 50 EXTREME SM - SENDA 50 R
GILERA: GSM 50 - H @ K - ZULU (2001) - RCR 50 - RCR 50 - SMT dal 2006-> (DERBI D50B) - SMT 50
VALENTI RACING: RME-SM (DERBI D50B)