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Discount 7.20€ Reward points: 7
AFAM Chain & Sprocket Kit reinforced 14x53 (size=420) Derbi Senda DRD after 2002 AFAM Chain & Sprocket Kit reinforced 14x53 (size=420) Derbi Senda DRD after 2002
Discount 0.50€
Spring for gear selector shaft Derbi
MotoForce Spring for gear selector shaft Derbi 3.90€3.40€
Reward points: 10
Gear Selector Shaft - original Derbi Euro 3 (D50B0) Gear Selector Shaft - original Derbi Euro 3 (D50B0) Gear Selector Shaft - original Derbi Euro 3 (D50B0)
Discount 12.10€ Reward points: 8
Malossi Primary Transmission 13/44 Yamaha Aerox / BW's
Malossi Malossi Primary Transmission 13/44 Yamaha Aerox / BW's 94.60€82.50€
Reward points: 1
Teknix Gear 10 teeth Peugeot 103 SPX / RCX
Discount 5.20€ Reward points: 4
Afam Rear Sprocket Sherco 50 Enduro / SM 56 teeth (428) Afam Rear Sprocket Sherco 50 Enduro / SM 56 teeth (428) Afam Rear Sprocket Sherco 50 Enduro / SM 56 teeth (428)
Discount 24.10€ Reward points: 17
Malossi MHR Power Transmission 26/40 without chain Yamaha T-Max 500cc before 2011
Reward points: 4
Afam Rear Sprocket Beta RR 02 / 05 51 teeth (420) Afam Rear Sprocket Beta RR 02 / 05 51 teeth (420) Afam Rear Sprocket Beta RR 02 / 05 51 teeth (420)
Discount 0.30€ Reward points: 1
Attaches rapide de chaîne Doppler 420
Discount 10.20€ Reward points: 10
Stage6 Primary Transmission 13/43 (3.31) Minarelli (13 teeth intermediate shaft) Stage6 Primary Transmission 13/43 (3.31) Minarelli (13 teeth intermediate shaft) Stage6 Primary Transmission 13/43 (3.31) Minarelli (13 teeth intermediate shaft)
Discount 1.20€ Reward points: 2
Gear Selector Shaft Derbi / Aprilia / Gilera Gear Selector Shaft Derbi / Aprilia / Gilera
Standard Parts Gear Selector Shaft Derbi / Aprilia / Gilera 28.80€27.60€
Reward points: 4
Chain Guard - original Derbi Senda DRD Pro / X-Treme
Reward points: 7
AFAM Chain Kit 14x53 Derbi SM Race / X-trem 2006 - 2010 AFAM Chain Kit 14x53 Derbi SM Race / X-trem 2006 - 2010
Discount 9.20€ Reward points: 10
Stage6 Primary Transmission 15/33 (2.20), Peugeot vertical Stage6 Primary Transmission 15/33 (2.20), Peugeot vertical Stage6 Primary Transmission 15/33 (2.20), Peugeot vertical
Discount 3.30€ Reward points: 9
Malossi Primary Transmission 13/35 Peugeot Speedfight
Malossi Malossi Primary Transmission 13/35 Peugeot Speedfight 108.90€105.60€
Reward points: 3
Chain Guide Derbi / Aprilia / Gilera blue
Standard Parts Chain Guide Derbi / Aprilia / Gilera blue 29.90€
Discount 14.70€ Reward points: 13
Stage6 Secondary Transmission, 14/41 (2,93), Minarelli Stage6 Secondary Transmission, 14/41 (2,93), Minarelli Stage6 Secondary Transmission, 14/41 (2,93), Minarelli
Stage6 Stage6 Secondary Transmission, 14/41 (2,93), Minarelli 150.20€135.50€
Discount 55.10€ Reward points: 9
Intermediate shaft Italjet Formula Intermediate shaft Italjet Formula
Italjet Intermediate shaft Italjet Formula 89.10€34.00€
Discount 6.50€ Reward points: 8
Doppler Primary Transmission 14-42 Yamaha Aerox / BW's
Doppler Doppler Primary Transmission 14-42 Yamaha Aerox / BW's 86.90€80.40€
Discount 0.90€ Reward points: 1
Attaches rapide de chaîne Doppler 428 Attaches rapide de chaîne Doppler 428 Attaches rapide de chaîne Doppler 428
Reward points: 1
Blue steel washer for intermediate shaft Minarelli, 14x29x1mm Blue steel washer for intermediate shaft Minarelli, 14x29x1mm Blue steel washer for intermediate shaft Minarelli, 14x29x1mm
Discount 25.20€ Reward points: 16
Malossi Primary Transmission 14/42 incl. additional bearing Yamaha Aerox
Discount 0.60€ Reward points: 7
Afam Chain Kit 12x50 428 Beta 50 RR Factory 2005 - 2013 Afam Chain Kit 12x50 428 Beta 50 RR Factory 2005 - 2013
Discount 0.10€ Reward points: 1
Chain Master Link 420 Stage6 Chain Master Link 420 Stage6 Chain Master Link 420 Stage6 Chain Master Link 420 Stage6
Stage6 Chain Master Link 420 Stage6 3.50€3.40€
Discount 2.30€ Reward points: 3
Front Sprocket Cover / Chain Guard Doppler alu neochrome Minarelli AM6 Front Sprocket Cover / Chain Guard Doppler alu neochrome Minarelli AM6
Discount 22.10€ Reward points: 10
Malossi Primary Transmission 15/42 Yamaha Aerox / BW's 100cc
Discount 10.00€ Reward points: 6
Chain Kit 14x53 (size=420) Derbi Senda SM / Cross after 2000
Front Sprocket 16 teeth Puch Maxi
Standard Parts Front Sprocket 16 teeth Puch Maxi 5.20€
Discount 17.90€ Reward points: 13
Stage6 Secondary Transmission 15/39 (2.60) Minarelli
Stage6 Stage6 Secondary Transmission 15/39 (2.60) Minarelli 150.20€132.30€
Discount 2.60€ Reward points: 2
Chain Guide Derbi / Aprilia / Gilera silver Chain Guide Derbi / Aprilia / Gilera silver Chain Guide Derbi / Aprilia / Gilera silver
Standard Parts Chain Guide Derbi / Aprilia / Gilera silver 24.80€22.20€
THE TRANSMISSION - TUNING VIA GEAR RATIO

The gearbox or transmission is a mechanical device that transfers motion from one part to another, with the possibility of changing speed and torque. On a scooter, there is the primary transmission (input shaft on torque drive + intermediate shaft) and the secondary transmission (intermediate shaft + output shaft on the wheel). Ttransmission ratio has a great influence on acceleration and final speed - a short transmission ratio brings... good acceleration, but is a bit weak on speed, which can be compensated by a longer gear ratio.

THE COMPLEX WORLD OF GEAR RATIOS

Maybe you just need to replace worn gear parts, or maybe you want to adjust the gear ratio after upgrading to a stronger cylinder. In both cases we recommend replacing both primary and secondary transmission at the same time.
For very powerful engines, we recommend selecting the gears in a way that the final drive ratio can adequately convert the power delivered by the engine. The use of a longer gear ratio may even worsen acceleration under certain circumstances, so you should always adapt the gearbox to the available speed. Longer does not always mean better, it is best to get some relevant information before installing a new transmission!
In our online shop we carry a large selection of individual gears and complete gearboxes for most scooters, mopeds and maxi scooters. Leading brands such as Stage6, Top Performances, Malossi, Polini and Doppler, we offer you real quality products at fair prices to improve the performance of your engine.