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Axle other Chain Chain accessories Chain guard Chain guide Chain kit Chain master link Chain roller Chain slider Chain tensioner Chassis screws Circlip Clutch accessories Clutch kit Crankshaft accessories CVT sliders Engine case accessories Fairing Front sprocket Gearbox Gearbox accessories Gearbox bearing kit Gearshift lever Ignition lock Kickstarter accessories Oil seal kit Piston pin bearing Pulley Pulley gear Chain rear sprocket Repair kit Screw kit Screws other Tank accessories Transmission Transmission accessories Transmission gear Washer Wheel axle Woodruff key
Brand
AFAM Algi Aprilia Avoc Beta Buzzetti Conti CPI D.I.D Derbi Doppler GY6 Hot Rods IGM Iris Italjet Jasil KMC KRM Kymco Malossi Moose Racing Moto Master MotoForce MotoForce Racing Peugeot Piaggio Polini Polisport Pro Circuit Prox Renthal RFX Rieju RMS Scar Schmitt Stage6 Stage6 R/T Standard Parts STR8 Swiing Top Performances UFO Voca Racing Volt Racing Yamaha YCF YCF Factory
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Standard Parts
Rear Sprocket 54 teeth MBK 51S (Grimeca rims d.98mm)
Article no.: CGN2972
2

Rear Sprocket 54 teeth MBK 51S (Grimeca rims d.98mm)

15,50 €
In stock
Standard Parts
Rear Sprocket 42 teeth MBK 51S (Grimeca rims d.98mm)
Article no.: CGN2968

Rear Sprocket 42 teeth MBK 51S (Grimeca rims d.98mm)

14,00 €
In stock
Standard Parts
Rear Sprocket 52 teeth Peugeot 103 SP / MV (d.94mm)
Article no.: CGN2935
1

Rear Sprocket 52 teeth Peugeot 103 SP / MV (d.94mm)

17,00 €
In stock
Standard Parts
Rear Sprocket 44 teeth MBK 40 / 50 (d.94mm)
Article no.: CGN2957

Rear Sprocket 44 teeth MBK 40 / 50 (d.94mm)

14,50 €
In stock
Standard Parts
Rear Sprocket 56 teeth Peugeot 103 SPX / RCX (Grimeca rims d.98mm)
Article no.: CGN2954

Rear Sprocket 56 teeth Peugeot 103 SPX / RCX (Grimeca rims d.98mm)

19,50 €
In stock
Standard Parts
Rear Sprocket 54 teeth Peugeot 103 SPX / RCX (Grimeca rims d.98mm)
Article no.: CGN2953

Rear Sprocket 54 teeth Peugeot 103 SPX / RCX (Grimeca rims d.98mm)

15,50 €
In stock
Standard Parts
Rear Sprocket 45 teeth Peugeot 103 SP / MV (d.94mm)
Article no.: CGN2933

Rear Sprocket 45 teeth Peugeot 103 SP / MV (d.94mm)

13,50 €
In stock
Standard Parts
Rear Sprocket BTS 56 teeth Peugeot 103 SP / MVL (pressed steel rims d.94mm)
Article no.: CGN2945
1

Rear Sprocket BTS 56 teeth Peugeot 103 SP / MVL (pressed steel rims d.94mm)

17,00 €
In stock
Standard Parts
Rear Sprocket BTS 54 teeth Peugeot 103 SP / MVL (pressed steel rims d.94mm)
Article no.: CGN2944

Rear Sprocket BTS 54 teeth Peugeot 103 SP / MVL (pressed steel rims d.94mm)

15,50 €
In stock
Standard Parts
Rear Sprocket 42 teeth Peugeot 103 SP / MV (RYS rims d.94mm)
Article no.: CGN244069

Rear Sprocket 42 teeth Peugeot 103 SP / MV (RYS rims d.94mm)

10,50 €
In stock
Doppler
Primary Gears Doppler 15-50 Yamaha Aerox / BW's
Article no.: CGN263894
1

Primary Gears Doppler 15-50 Yamaha Aerox / BW's

69,00 €
In stock
Standard Parts
Retaining Plate f. sprocket Derbi Euro 2 / Euro 3
Article no.: CGN484861
2

Retaining Plate f. sprocket Derbi Euro 2 / Euro 3

4,50 €
In stock
Polini
Primary Transmission Polini 14/37 Kymco Dink / Grand Dink 150cc
Article no.: P202.1386

Primary Transmission Polini 14/37 Kymco Dink / Grand Dink 150cc

62,50 €
In stock
Polini
Secondary Transmission Polini 16/36 Yamaha Majesty 250cc (1996-2005)
Article no.: P202.1384

Secondary Transmission Polini 16/36 Yamaha Majesty 250cc (1996-2005)

116,00 €
In stock
Standard Parts
Chain Master Link Iris standard d=415
Article no.: CGN8869

Chain Master Link Iris standard d=415

2,30 €
In stock
Standard Parts
Gear 10 teeth Peugeot 103 SPX / RCX
Article no.: CGN860

Gear 10 teeth Peugeot 103 SPX / RCX

8,30 €
In stock
Standard Parts
Gear 13 teeth Peugeot 103 SP / MVL / Vogue
Article no.: CGN858

Gear 13 teeth Peugeot 103 SP / MVL / Vogue

8,10 €
In stock
Standard Parts
Gear 12 teeth Peugeot 103 SP / MVL / Vogue
Article no.: CGN857
1

Gear 12 teeth Peugeot 103 SP / MVL / Vogue

5,70 €
In stock
5,90 €
-3% Discount
Standard Parts
Gear 11 teeth Peugeot 103 SP / MVL / Vogue
Article no.: CGN855

Gear 11 teeth Peugeot 103 SP / MVL / Vogue

5,80 €
In stock
Standard Parts
Pedal Shaft Peugeot 103 SP / MV / Vogue
Article no.: CGN702
1

Pedal Shaft Peugeot 103 SP / MV / Vogue

11,00 €
In stock
Sale
Standard Parts
Pedal Spacer Ring MBK 51
Article no.: CGN4277

Pedal Spacer Ring MBK 51

2,60 €
In stock
Standard Parts
Pedal Shaft MBK 51 / 41
Article no.: CGN4272

Pedal Shaft MBK 51 / 41

14,50 €
In stock
Standard Parts
Rear Sprocket 48 teeth MBK 51 (Grimeca rim)
Article no.: CGN2970

Rear Sprocket 48 teeth MBK 51 (Grimeca rim)

13,50 €
In stock
Standard Parts
Rear Sprocket 52 teeth Peugeot 103 SP / MVL (pressed steel rims)
Article no.: CGN2943

Rear Sprocket 52 teeth Peugeot 103 SP / MVL (pressed steel rims)

17,00 €
In stock
AFAM
Chain Kit AFAM 12x53 Aprilia RS/RX/RS4 2006 - 2010
Article no.: CGN482389
3

Chain Kit AFAM 12x53 Aprilia RS/RX/RS4 2006 - 2010

73,00 €
In stock
Standard Parts
Roller for Chain Tensioner size=32mm inner diameter 8mm
Article no.: CGN440593
3

Roller for Chain Tensioner size=32mm inner diameter 8mm

9,40 €
In stock
Standard Parts
Gearbox Minarelli AM6 1st series
Article no.: CGN370101
1

Gearbox Minarelli AM6 1st series

127,00 €
In stock
Top Performances
Secondary Gears 16/41 Top Performances Yamaha Aerox / BW's
Article no.: T990875P
1

Secondary Gears 16/41 Top Performances Yamaha Aerox / BW's

121,00 €
In stock
Polini
Wheel Axle / Driveshaft reinforced Polini Piaggio NRG / Typhoon after 1998
Article no.: P202.1410
1

Wheel Axle / Driveshaft reinforced Polini Piaggio NRG / Typhoon after 1998

92,50 €
In stock
Standard Parts
Chain Kit 12x47 (size=420) Aprilia RS 1999 - 2004 (AM6)
Article no.: CGN455167
7

Chain Kit 12x47 (size=420) Aprilia RS 1999 - 2004 (AM6)

45,50 €
In stock
AFAM
Chain Kit AFAM reinforced 14x53 (size=420) Derbi Senda DRD after 2002
Article no.: CGN467432
3

Chain Kit AFAM reinforced 14x53 (size=420) Derbi Senda DRD after 2002

58,00 €
In stock
Sale
Iris
Chain Iris standard 106 links size 415
Article no.: CGN3037
3

Chain Iris standard 106 links size 415

8,80 €
In stock
Iris
Chain Iris standard 120 links size 415
Article no.: CGN3038
2

Chain Iris standard 120 links size 415

12,50 €
In stock
Iris
Chain Iris reinforced 108 links size 415 gold
Article no.: CGN321025

Chain Iris reinforced 108 links size 415 gold

15,50 €
In stock
Iris
Chain Iris reinforced 106 links size 415 gold
Article no.: CGN3039
1

Chain Iris reinforced 106 links size 415 gold

15,00 €
In stock
Top Performances
Gearwheel 6th gear primary shaft Top Performances T26 AM6 V1
Article no.: T9919080
9

Gearwheel 6th gear primary shaft Top Performances T26 AM6 V1

48,00 €
In stock
52,00 €
-8% Discount
Sale
Conti
Pinion / Adapter Conti 14 teeth Derbi Euro 3 crankshaft on Euro 2
Article no.: CT0107RF1210
3

Pinion / Adapter Conti 14 teeth Derbi Euro 3 crankshaft on Euro 2

24,00 €
In stock
26,50 €
-9% Discount
Sale
Polini
Secondary Gears Polini 16/47 Piaggio NRG after 1998
Article no.: P202.1402
1

Secondary Gears Polini 16/47 Piaggio NRG after 1998

90,50 €
In stock
Top Performances
Gear Shift Cam Top Performances
Article no.: T9920020
4

Gear Shift Cam Top Performances

86,00 €
In stock
Standard Parts
Chain Tensioner
Article no.: A170700

Chain Tensioner

4,00 €
In stock
Voca Racing
Rear Sprocket 40 teeth - 420 Voca Alu Neochrome Yamaha DT 50 LC Portugal
Article no.: VCR-SD450.YDT.40/TI

Rear Sprocket 40 teeth - 420 Voca Alu Neochrome Yamaha DT 50 LC Portugal

42,00 €
In stock
Voca Racing
Rear Sprocket 40 teeth - 420 Voca Alu Red Yamaha DT 50 LC Portugal
Article no.: VCR-SD450.YDT.40/RE

Rear Sprocket 40 teeth - 420 Voca Alu Red Yamaha DT 50 LC Portugal

39,00 €
In stock
42,00 €
-7% Discount
Sale
Doppler
Chain Guide Doppler Derbi / Aprilia / Gilera purple
Article no.: CGN533906

Chain Guide Doppler Derbi / Aprilia / Gilera purple

34,00 €
In stock
Doppler
Rear Sprocket 53 teeth - 420 Doppler aluminium CNC purple Rieju MRT
Article no.: CGN533905

Rear Sprocket 53 teeth - 420 Doppler aluminium CNC purple Rieju MRT

48,00 €
In stock
50,50 €
-5% Discount
Sale
Doppler
Rear Sprocket 53 teeth - 428 Doppler aluminium CNC purple Beta RR 50
Article no.: CGN533904

Rear Sprocket 53 teeth - 428 Doppler aluminium CNC purple Beta RR 50

54,00 €
In stock
55,50 €
-3% Discount
Sale
Doppler
Rear Sprocket 53 teeth - 428 Doppler aluminium CNC purple Sherco Enduro 50
Article no.: CGN533902

Rear Sprocket 53 teeth - 428 Doppler aluminium CNC purple Sherco Enduro 50

58,00 €
In stock
59,50 €
-3% Discount
Sale
Standard Parts
Chain Tensioner Puch Maxi
Article no.: MOF-44133

Chain Tensioner Puch Maxi

7,50 €
In stock
Standard Parts
Chain Guard reinforced Derbi Senda / Aprilia SX / Gilera SMT aluminium black
Article no.: STR-730.10/BK

Chain Guard reinforced Derbi Senda / Aprilia SX / Gilera SMT aluminium black

30,00 €
In stock
Standard Parts
Chain Guard reinforced Rieju MRT aluminium black
Article no.: STR-730.11/BK

Chain Guard reinforced Rieju MRT aluminium black

31,50 €
In stock
Standard Parts
Rear Sprocket Premium 60 teeth 428 Vent Derapage / Baja 50 Euro 5
Article no.: SP-52651

Rear Sprocket Premium 60 teeth 428 Vent Derapage / Baja 50 Euro 5

58,50 €
In stock
Standard Parts
Rear Sprocket steel 62 teeth 420 CPI SM
Article no.: MF89.00374

Rear Sprocket steel 62 teeth 420 CPI SM

25,50 €
In stock
Standard Parts
Chain Tensioner Set 12mm aluminium Puch / Simson / Kreidler / Sachs silver
Article no.: MOF-43010/SI

Chain Tensioner Set 12mm aluminium Puch / Simson / Kreidler / Sachs silver

9,80 €
In stock
Standard Parts
Chain Tensioner Set 12mm aluminium Puch / Simson / Kreidler / Sachs red
Article no.: MOF-43010/RE

Chain Tensioner Set 12mm aluminium Puch / Simson / Kreidler / Sachs red

9,80 €
In stock
Standard Parts
Chain Tensioner Set 12mm aluminium Puch / Simson / Kreidler / Sachs black
Article no.: MOF-43010/BK

Chain Tensioner Set 12mm aluminium Puch / Simson / Kreidler / Sachs black

9,90 €
In stock
Standard Parts
Chain Tensioner Set 12mm aluminium Puch / Simson / Kreidler / Sachs blue
Article no.: MOF-43010/BL

Chain Tensioner Set 12mm aluminium Puch / Simson / Kreidler / Sachs blue

9,80 €
In stock
Standard Parts
Rear Sprocket 48 teeth Peugeot 101 / 102
Article no.: CGN534531

Rear Sprocket 48 teeth Peugeot 101 / 102

15,00 €
In stock
Standard Parts
Rear Sprocket 42 teeth Peugeot 101 / 102
Article no.: CGN534532

Rear Sprocket 42 teeth Peugeot 101 / 102

15,00 €
In stock
Standard Parts
Shift Drum Lock Lever Kit Generic / CPI / KSR
Article no.: MF60.19508

Shift Drum Lock Lever Kit Generic / CPI / KSR

13,50 €
In stock
Standard Parts
Chain Tensioner Roll Derbi Senda
Article no.: MF89.00160

Chain Tensioner Roll Derbi Senda

12,00 €
In stock
Standard Parts
Swingarm Slider Rieju MRT
Article no.: MF89.00185

Swingarm Slider Rieju MRT

12,00 €
In stock
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51

The gearbox - tuning via gear ratio

The gearbox or transmission is a mechanical device that transmits a motion from one part to another, with the possibility of changing speed and torque by gearing up or gearing down. In a scooter, there is the primary transmission (input shaft to torque drive + intermediate shaft) and secondary transmission (intermediate shaft + output shaft to wheel). The gear ratio has a great impact on acceleration and top speed. A short gear ratio gives good acceleration, but is a little weak on speed, which can be compensated by a longer gear ratio.

Since the gearbox is a very complex subject, here we have a gearbox tutorial for you that will help you choose your new gear ratio.

The complex world of gear ratios

Do you simply want to replace gearbox components because they are defective or worn? Or do you want to adjust the gear ratio after upgrading to a more powerful cylinder? In both cases, we recommend replacing both primary and secondary gears 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. Using a longer gear ratio may actually worsen acceleration, so you should always match the gearbox to the available RPM. Longer does not always mean better, it is best to get enough information before installing new gears!

In our online store we carry a wide range of individual gears and complete gearboxess for most scooters, mopeds and maxi scooters. Leading brands such as

offer top quality products at fair prices, with which you can improve the performance of your engine.

If you simply want to overhaul your gearbox, we also carry original spare parts for you, for manufacturers like

and many more.

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