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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 Needle bearing Oil seal kit 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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Jasil
Gearbox complete Top Racing AM6
Article no.: JA6250004

Gearbox complete Top Racing AM6

357,00 €
Currently not in stock
Standard Parts
Chain Roller 10mm - black Pit Bike / Dirt Bike
Article no.: MB7511

Chain Roller 10mm - black Pit Bike / Dirt Bike

5,60 €
Currently not in stock
Standard Parts
Front Sprocket Retainer d.17mm Pit Bike
Article no.: MB2511

Front Sprocket Retainer d.17mm Pit Bike

2,70 €
Currently not in stock
Standard Parts
Chain Guide PTFE spacing 33mm black Pit Bike / Dirt Bike
Article no.: MB2477

Chain Guide PTFE spacing 33mm black Pit Bike / Dirt Bike

13,00 €
Currently not in stock
Doppler
Chain Master Link Doppler 420 yellow
Article no.: CGN504532

Chain Master Link Doppler 420 yellow

3,00 €
Currently not in stock
3,20 €
-6% Discount
Doppler
Rear Sprocket 53 teeth - 420 Doppler aluminium CNC black Aprilia SX 50
Article no.: CGN500922

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

46,00 €
Currently not in stock
Doppler
Chain reinforced 134 links D.420 Doppler chrome
Article no.: CGN501121

Chain reinforced 134 links D.420 Doppler chrome

25,00 €
Currently not in stock
30,50 €
-18% Discount
Doppler
Chain Tensioner Doppler Alu black Rieju MRT
Article no.: CGN500945

Chain Tensioner Doppler Alu black Rieju MRT

21,00 €
Currently not in stock
Doppler
Chain Tensioner Doppler Alu red Beta
Article no.: CGN500942

Chain Tensioner Doppler Alu red Beta

21,00 €
Currently not in stock
25,50 €
-18% Discount
Standard Parts
Rear Sprocket steel 60 teeth - 420 Rieju MRT
Article no.: MF89.00327

Rear Sprocket steel 60 teeth - 420 Rieju MRT

29,00 €
Currently not in stock
Str8
Front Sprocket 420 orange Minarelli AM6
Article no.: STR-71ORANGEAM6

Front Sprocket 420 orange Minarelli AM6

from 9,00 €
Currently not in stock
10,00 €
-10% Discount
Standard Parts
Front Sprocket 12 teeth 420 Derbi Euro2 before 1999
Article no.: L-SA5521

Front Sprocket 12 teeth 420 Derbi Euro2 before 1999

8,00 €
Currently not in stock
Standard Parts
Front Sprocket 13 teeth 420 Derbi Euro2 before 1999
Article no.: L-SA3692

Front Sprocket 13 teeth 420 Derbi Euro2 before 1999

8,40 €
Currently not in stock
Derbi
Chain Guard Derbi Senda DRD Pro / X-Treme
Article no.: OE-DE00H01508181

Chain Guard Derbi Senda DRD Pro / X-Treme

38,50 €
Currently not in stock
Derbi
Swingarm Slider Derbi Senda / Gilera SMT
Article no.: OE-DE00H01803331

Swingarm Slider Derbi Senda / Gilera SMT

25,50 €
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
Rieju
Chain Tensioner OEM quality Rieju 50
Article no.: EKP-126742

Chain Tensioner OEM quality Rieju 50

13,50 €
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

89,00 €
Currently not in stock
99,00 €
-10% Discount
Derbi
Gear Selector Shaft Derbi Euro 3 (D50B0)
Article no.: OE-DE847236

Gear Selector Shaft Derbi Euro 3 (D50B0)

103,00 €
Currently not in stock
Derbi
Lever for gear selector shaft Derbi Euro 3 (D50B0)
Article no.: OE-DE847068
1

Lever for gear selector shaft Derbi Euro 3 (D50B0)

15,50 €
Currently not in stock
Standard Parts
Rear Sprocket 45 teeth Peugeot 103 SPX / RCX (Grimeca 98mm)
Article no.: CGN2949

Rear Sprocket 45 teeth Peugeot 103 SPX / RCX (Grimeca 98mm)

13,50 €
Currently not in stock
Doppler
Secondary Gears 14-41 Doppler Minarelli
Article no.: CGN279301
2

Secondary Gears 14-41 Doppler Minarelli

71,00 €
Currently not in stock
RRP
79,00 €
-10% Discount
Standard Parts
Gear 13 teeth Peugeot 103 SP / MVL / Vogue
Article no.: CGN858

Gear 13 teeth Peugeot 103 SP / MVL / Vogue

9,00 €
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
AFAM
Chain Kit AFAM reinforced 14x53 - 420 Derbi Senda DRD after 2002
Article no.: CGN467432
3

Chain Kit AFAM reinforced 14x53 - 420 Derbi Senda DRD after 2002

58,50 €
Currently not in stock
Standard Parts
Chain Guard Derbi Senda aluminum black
Article no.: SP-214473

Chain Guard Derbi Senda aluminum black

22,50 €
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 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

30,00 €
Currently not in stock
30,50 €
-2% Discount
Doppler
Rear Sprocket steel 53 teeth - 428 Doppler Origin Sherco 50
Article no.: CGN528468

Rear Sprocket steel 53 teeth - 428 Doppler Origin Sherco 50

30,00 €
Currently not in stock
30,50 €
-2% Discount
Standard Parts
Rear Sprocket steel 62 teeth 420 CPI SM
Article no.: MF89.00374

Rear Sprocket steel 62 teeth 420 CPI SM

27,00 €
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
Swingarm Slider Rieju MRT
Article no.: MF89.00185

Swingarm Slider Rieju MRT

12,00 €
Currently not in stock
AFAM
Chain Kit Sherco SE-R 50 Afam 12x56 - 428 (original ratio)
Article no.: AFAM150806

Chain Kit Sherco SE-R 50 Afam 12x56 - 428 (original ratio)

61,00 €
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
Voca Racing
Rear Sprocket Sherco SM-R 50cc 53 teeth - 428 Alu red
Article no.: VCR-SD450.SHO.53/RE

Rear Sprocket Sherco SM-R 50cc 53 teeth - 428 Alu red

55,50 €
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 Rieju MRT 50 teeth - 420 Voca Alu black
Article no.: VCR-SD450.MRT.50/BK

Rear Sprocket Rieju MRT 50 teeth - 420 Voca Alu black

49,00 €
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 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 black
Article no.: VCR-SD450.BETA.48/BK

Rear Sprocket Beta RR 48 teeth - 420 Voca Alu black

45,00 €
Currently not in stock
Voca Racing
Rear Sprocket Aprilia SX 50cc 48 teeth - 420 Voca Alu blue
Article no.: VCR-SD450.SDA.48/BL

Rear Sprocket Aprilia SX 50cc 48 teeth - 420 Voca Alu blue

51,00 €
Currently not in stock
UFO
Swingarm Slider Yamaha YZ 85 2002-2018 black UFO
Article no.: UF-YA03894#001

Swingarm Slider Yamaha YZ 85 2002-2018 black UFO

20,00 €
Currently not in stock
Doppler
Chain Kit Doppler 13x53 - 428 Sherco 50 Alu Black
Article no.: CGN526754

Chain Kit Doppler 13x53 - 428 Sherco 50 Alu Black

89,00 €
Currently not in stock
102,00 €
-13% Discount
AFAM
Chain Kit Rieju MRT after 2018 Afam 11x62
Article no.: CGN518452

Chain Kit Rieju MRT after 2018 Afam 11x62

74,00 €
Currently not in stock
Doppler
Chain Guide Doppler Rieju MRT Neochrome
Article no.: CGN520883

Chain Guide Doppler Rieju MRT Neochrome

30,00 €
Currently not in stock
36,50 €
-18% Discount
Standard Parts
Chain Guide / Frame Guard Puch Maxi N
Article no.: IP44214

Chain Guide / Frame Guard Puch Maxi N

11,00 €
Currently not in stock
Standard Parts
Chain Guide / Frame Guard Puch Maxi S
Article no.: IP44151

Chain Guide / Frame Guard Puch Maxi S

7,70 €
Currently not in stock
Standard Parts
Chain Kit 14x60 - 420 Afam Rieju MRT
Article no.: CGN516910

Chain Kit 14x60 - 420 Afam Rieju MRT

75,00 €
Currently not in stock
Doppler
Chain Kit steel 13x53 Doppler Origin Rieju MRT
Article no.: CGN517747

Chain Kit steel 13x53 Doppler Origin Rieju MRT

60,00 €
Currently not in stock
79,00 €
-24% Discount
Doppler
Chain Kit steel 14x53 - 420 Doppler Origin Derbi Senda DRD
Article no.: CGN515040

Chain Kit steel 14x53 - 420 Doppler Origin Derbi Senda DRD

60,00 €
Currently not in stock
79,00 €
-24% Discount
Doppler
Chain Kit steel 13x53 - 420 Doppler Origin Yamaha TZR 50
Article no.: CGN515038

Chain Kit steel 13x53 - 420 Doppler Origin Yamaha TZR 50

60,00 €
Currently not in stock
79,00 €
-24% Discount
Polini
Secondary Gears Polini 15/39 Honda SH 125/150i before 2012
Article no.: P202.1408

Secondary Gears Polini 15/39 Honda SH 125/150i before 2012

121,00 €
Currently not in stock
RRP
143,00 €
-15% Discount
Doppler
Rear Sprocket 60 teeth Doppler aluminium CNC black MBK 51 / Peugeot 103
Article no.: CGN512881

Rear Sprocket 60 teeth Doppler aluminium CNC black MBK 51 / Peugeot 103

49,50 €
Currently not in stock
RRP
50,00 €
-1% Discount
Top Performances
Primary Gears 15/50 Top Performances Yamaha Aerox / BW's
Article no.: T9913300
1

Primary Gears 15/50 Top Performances Yamaha Aerox / BW's

72,50 €
Currently not in stock
RRP
98,00 €
-26% Discount
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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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