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Transmission

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Bracket Bushings & Spacers Chain Chain accessories Chain guard Chain guide Chain kit Chain master link Chain roller Chain slider Chain tensioner Circlip Clutch accessories Clutch gear Clutch kit Clutch release lever Clutch springs CVT sliders Fairing Front sprocket Gearbox Gearbox accessories Gearbox bearing kit Gearshift lever Ignition lock Oil seal kit Piston pin bearing Pulley Pulley gear Chain rear sprocket Repair kit Spring Transmission Transmission accessories Transmission gear Washer Wheel axle Woodruff key Bearing ball Cable guide Fuel cap Gear selector shaft Overflow hose Pedal shaft Sprocket screws
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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Derbi
Swingarm Slider Derbi Senda / Gilera SMT
Article no.: OE-DE00H01803331

Swingarm Slider Derbi Senda / Gilera SMT

25,50 €
Currently not in stock
Doppler
Rear Sprocket 53 teeth - 428 Doppler aluminium CNC red Sherco Enduro 50
Article no.: CGN496462
2

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

64,50 €
Currently not in stock
Doppler
Rear Sprocket 53 teeth - 420 Doppler aluminium CNC red Aprilia SX 50
Article no.: CGN492590

Rear Sprocket 53 teeth - 420 Doppler aluminium CNC red Aprilia SX 50

55,50 €
Currently not in stock
Doppler
Rear Sprocket 53 teeth - 420 Doppler aluminium CNC gold Rieju MRT
Article no.: CGN491209

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

55,00 €
Currently not in stock
Standard Parts
Rear Sprocket 53 teeth 420 Derbi DRD Pro
Article no.: 34937

Rear Sprocket 53 teeth 420 Derbi DRD Pro

23,50 €
Currently not in stock
Standard Parts
Secondary Gears / Output Shaft long - GY6 50cc 139QMB
Article no.: BT16623

Secondary Gears / Output Shaft long - GY6 50cc 139QMB

14,00 €
Currently not in stock
Polini
Primary Gears Polini Piaggio Zip / Vespa ET2 after 2000
Article no.: P202.1392
1

Primary Gears Polini Piaggio Zip / Vespa ET2 after 2000

80,50 €
Currently not in stock
RRP
97,00 €
-17% Discount
GY6
Gear input shaft (clutch) - GY6 50cc 139QMB
Article no.: OE-GY6BT13868

Gear input shaft (clutch) - GY6 50cc 139QMB

12,50 €
Currently not in stock
Doppler
Chain Kit aluminium gold 13x53 - 420 Doppler Rieju MRT
Article no.: CGN491213
5

Chain Kit aluminium gold 13x53 - 420 Doppler Rieju MRT

99,00 €
Currently not in stock
Polini
Primary Gears Polini 15/38 2.53 / +22.9% Vespa ET2 98 / LX 50cc
Article no.: P202.1405

Primary Gears Polini 15/38 2.53 / +22.9% Vespa ET2 98 / LX 50cc

80,50 €
Currently not in stock
RRP
97,00 €
-17% Discount
Polini
Primary Gears Polini 14/39 Piaggio Zip LC after 2000
Article no.: P202.1407

Primary Gears Polini 14/39 Piaggio Zip LC after 2000

89,00 €
Currently not in stock
RRP
97,00 €
-8% Discount
Standard Parts
Rear Sprocket 54 teeth MBK 68 / 88 / 89 (d.110mm)
Article no.: CGN2963

Rear Sprocket 54 teeth MBK 68 / 88 / 89 (d.110mm)

15,50 €
Currently not in stock
Standard Parts
Rear Sprocket 48 teeth Peugeot 103 SP / MV (d.94mm)
Article no.: CGN2934

Rear Sprocket 48 teeth Peugeot 103 SP / MV (d.94mm)

18,00 €
Currently not in stock
Standard Parts
Rear Sprocket BTS 50 teeth Peugeot 103 SP / MVL (steel rims 94mm)
Article no.: CGN2942

Rear Sprocket BTS 50 teeth Peugeot 103 SP / MVL (steel rims 94mm)

17,00 €
Currently not in stock
Doppler
Secondary Gears 14-41 Doppler Minarelli
Article no.: CGN279301
2

Secondary Gears 14-41 Doppler Minarelli

63,50 €
Currently not in stock
69,50 €
-9% Discount
Standard Parts
Rear Sprocket 48 teeth - 420 Peugeot / Rieju
Article no.: CGN484142
1

Rear Sprocket 48 teeth - 420 Peugeot / Rieju

21,50 €
Currently not in stock
Standard Parts
Gear 11 teeth Peugeot 103 SPX / RCX
Article no.: CGN861

Gear 11 teeth Peugeot 103 SPX / RCX

6,70 €
Currently not in stock
Standard Parts
Pinion 13 teeth MBK 51
Article no.: CGN4261

Pinion 13 teeth MBK 51

9,60 €
Currently not in stock
Standard Parts
Rear Sprocket 52 teeth Peugeot 103 SP / MVL (steel rims)
Article no.: CGN2943

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

17,00 €
Currently not 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

66,00 €
Currently not in stock
AFAM
Chain Kit AFAM 11x60 Yamaha TZR after 2003
Article no.: CGN478546
2

Chain Kit AFAM 11x60 Yamaha TZR after 2003

58,50 €
Currently not in stock
Iris
Chain Iris reinforced 108 links size 415 gold
Article no.: CGN321025

Chain Iris reinforced 108 links size 415 gold

15,50 €
Currently not in stock
Polini
Kickstart Repair Kit Polini Piaggio
Article no.: P290.0136

Kickstart Repair Kit Polini Piaggio

34,50 €
Currently not in stock
RRP
39,00 €
-12% Discount
Top Performances
Gearbox Washers and Circlips AM6 (1st series)
Article no.: T9935030

Gearbox Washers and Circlips AM6 (1st series)

15,50 €
Currently not in stock
RRP
19,00 €
-18% Discount
Top Performances
Gear Selector Fork Set forged Top Performances AM6
Article no.: TAM00046

Gear Selector Fork Set forged Top Performances AM6

77,00 €
Currently not in stock
RRP
95,00 €
-19% Discount
Doppler
Chain Guide Doppler Derbi / Aprilia / Gilera purple
Article no.: CGN533906

Chain Guide Doppler Derbi / Aprilia / Gilera purple

38,00 €
Currently not in stock
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

55,50 €
Currently not in stock
Doppler
Rear Sprocket 53 teeth - 420 Doppler aluminium CNC purple Beta RR 50
Article no.: CGN533903

Rear Sprocket 53 teeth - 420 Doppler aluminium CNC purple Beta RR 50

50,50 €
Currently not in stock
Doppler
Chain Kit steel 13x53 - 428 Doppler Origin Beta RR
Article no.: CGN515037

Chain Kit steel 13x53 - 428 Doppler Origin Beta RR

69,50 €
Currently not in stock
Doppler
Rear Sprocket steel 53 teeth - 420 Doppler Origin Fantic XM / XE
Article no.: CGN534140

Rear Sprocket steel 53 teeth - 420 Doppler Origin Fantic XM / XE

30,50 €
Currently not in stock
Doppler
Rear Sprocket steel 53 teeth - 428 Doppler Origin Sherco 50
Article no.: CGN528468

Rear Sprocket steel 53 teeth - 428 Doppler Origin Sherco 50

30,50 €
Currently not in stock
Standard Parts
Rear Sprocket steel 53 teeth 420 CPI SM
Article no.: MF89.00373

Rear Sprocket steel 53 teeth 420 CPI SM

18,00 €
Currently not 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

9,50 €
Currently not in stock
9,70 €
-2% Discount
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

9,80 €
Currently not in stock
Standard Parts
Rear Sprocket 42 teeth Peugeot 101 / 102
Article no.: CGN534532

Rear Sprocket 42 teeth Peugeot 101 / 102

15,00 €
Currently not in stock
Standard Parts
Chain Tensioner Roll Derbi Senda
Article no.: MF89.00160

Chain Tensioner Roll Derbi Senda

13,00 €
Currently not in stock
Standard Parts
Swingarm Slider Rieju MRT
Article no.: MF89.00185

Swingarm Slider Rieju MRT

12,00 €
Currently not in stock
AFAM
Chain Kit Sherco SM-R Afam 11x60 - 428 (original gear ratio)
Article no.: AFAM205405

Chain Kit Sherco SM-R Afam 11x60 - 428 (original gear ratio)

93,00 €
Currently not in stock
AFAM
Chain Kit Aprilia RX 50 1995 - 1998 Afam 12x51 - 420 (original ratio)
Article no.: AFAM31762

Chain Kit Aprilia RX 50 1995 - 1998 Afam 12x51 - 420 (original ratio)

57,50 €
Currently not in stock
AFAM
Chain Kit Aprilia RS 50 2006 - 2011 Afam 11x53 - 420 (original gear ratio)
Article no.: AFAM4305

Chain Kit Aprilia RS 50 2006 - 2011 Afam 11x53 - 420 (original gear ratio)

59,50 €
Currently not in stock
AFAM
Rear Sprocket Sherco SM 50 Afam 56 teeth - 428
Article no.: AFAM205406

Rear Sprocket Sherco SM 50 Afam 56 teeth - 428

63,00 €
Currently not in stock
AFAM
Rear Sprocket steel Suzuki RMX / SMX Afam 50 teeth - 420
Article no.: AFAM160796

Rear Sprocket steel Suzuki RMX / SMX Afam 50 teeth - 420

26,00 €
Currently not in stock
AFAM
Rear Sprocket steel Sherco Enduro 50 Afam 53 teeth - 428
Article no.: AFAM201809

Rear Sprocket steel Sherco Enduro 50 Afam 53 teeth - 428

26,50 €
Currently not in stock
AFAM
Rear Sprocket steel Generic Trigger Afam 50 teeth - 420
Article no.: AFAM160795

Rear Sprocket steel Generic Trigger Afam 50 teeth - 420

24,50 €
Currently not in stock
AFAM
Rear Sprocket steel Derbi DRD Pro Afam 53 teeth - 420
Article no.: AFAM160792

Rear Sprocket steel Derbi DRD Pro Afam 53 teeth - 420

25,50 €
Currently not in stock
Rieju
Chain Tensioner Rieju MRT (x2)
Article no.: OE-RIE0000.640.5010

Chain Tensioner Rieju MRT (x2)

18,00 €
Currently not in stock
Voca Racing
Rear Sprocket Yamaha DT 50 LC Portugal 38 teeth - 420 Alu Neochrome
Article no.: VCR-SD450.YDT.38/TI

Rear Sprocket Yamaha DT 50 LC Portugal 38 teeth - 420 Alu Neochrome

42,00 €
Currently not in stock
Voca Racing
Rear Sprocket Sherco SM-R 50cc 50 teeth - 428 Alu Neochrome
Article no.: VCR-SD450.SHO.50/TI

Rear Sprocket Sherco SM-R 50cc 50 teeth - 428 Alu Neochrome

54,50 €
Currently not in stock
Voca Racing
Rear Sprocket Sherco SM-R 50cc 50 teeth - 428 Alu blue
Article no.: VCR-SD450.SHO.50/BL

Rear Sprocket Sherco SM-R 50cc 50 teeth - 428 Alu blue

54,00 €
Currently not in stock
Voca Racing
Rear Sprocket Sherco SM-R 50cc 50 teeth - 428 Alu black
Article no.: VCR-SD450.SHO.50/BK

Rear Sprocket Sherco SM-R 50cc 50 teeth - 428 Alu black

54,00 €
Currently not in stock
Voca Racing
Rear Sprocket Rieju MRT 50 teeth - 420 Voca Alu Neochrome
Article no.: VCR-SD450.MRT.50/TI

Rear Sprocket Rieju MRT 50 teeth - 420 Voca Alu Neochrome

51,50 €
Currently not in stock
Voca Racing
Rear Sprocket Rieju MRT 50 teeth - 420 Voca Alu blue
Article no.: VCR-SD450.MRT.50/BL

Rear Sprocket Rieju MRT 50 teeth - 420 Voca Alu blue

49,50 €
Currently not in stock
Voca Racing
Rear Sprocket Rieju MRT 48 teeth - 420 Voca Alu red
Article no.: VCR-SD450.MRT.48/RE

Rear Sprocket Rieju MRT 48 teeth - 420 Voca Alu red

47,00 €
Currently not in stock
Voca Racing
Rear Sprocket Rieju MRT 48 teeth - 420 Voca Alu Neochrome
Article no.: VCR-SD450.MRT.48/TI

Rear Sprocket Rieju MRT 48 teeth - 420 Voca Alu Neochrome

48,50 €
Currently not in stock
Voca Racing
Rear Sprocket Beta RR 50 teeth - 420 Voca Alu red
Article no.: VCR-SD450.BETA.50/RE

Rear Sprocket Beta RR 50 teeth - 420 Voca Alu red

49,00 €
Currently not in stock
Voca Racing
Rear Sprocket Beta RR 50 teeth - 420 Voca Alu black
Article no.: VCR-SD450.BETA.50/BK

Rear Sprocket Beta RR 50 teeth - 420 Voca Alu black

49,00 €
Currently not in stock
Voca Racing
Rear Sprocket Beta RR 50 teeth - 420 Voca Alu blue
Article no.: VCR-SD450.BETA.50/BL

Rear Sprocket Beta RR 50 teeth - 420 Voca Alu blue

50,00 €
Currently not in stock
Voca Racing
Rear Sprocket Beta RR 48 teeth - 420 Voca Alu red
Article no.: VCR-SD450.BETA.48/RE

Rear Sprocket Beta RR 48 teeth - 420 Voca Alu red

41,50 €
Currently not in stock
Voca Racing
Rear Sprocket Beta RR 48 teeth - 420 Voca Alu Neochrome
Article no.: VCR-SD450.BETA.48/TI

Rear Sprocket Beta RR 48 teeth - 420 Voca Alu Neochrome

45,00 €
Currently not in stock
Voca Racing
Rear Sprocket Beta RR 48 teeth - 420 Voca Alu blue
Article no.: VCR-SD450.BETA.48/BL

Rear Sprocket Beta RR 48 teeth - 420 Voca Alu blue

42,50 €
Currently not in stock
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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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