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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 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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Doppler
Chain reinforced 134 links D.420 Doppler chrome
Article no.: CGN501121

Chain reinforced 134 links D.420 Doppler chrome

30,50 €
Currently not in stock
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
Derbi
Chain Tensioner (x1) Derbi DRD Racing
Article no.: OE-DE00H01304811

Chain Tensioner (x1) Derbi DRD Racing

49,50 €
Currently not in stock
Standard Parts
Rear Sprocket 53 teeth 420 Derbi Derbi DRD Pro
Article no.: 34937

Rear Sprocket 53 teeth 420 Derbi Derbi DRD Pro

25,00 €
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
Polini
Primary Gears Polini 14/39 Piaggio Diesis / Zip LC after 2000
Article no.: P202.1407

Primary Gears Polini 14/39 Piaggio Diesis / Zip LC after 2000

80,50 €
Currently not in stock
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 €
Currently not 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 €
Currently not in stock
Standard Parts
Pedal Spacer Ring MBK 51
Article no.: CGN4277

Pedal Spacer Ring MBK 51

2,60 €
Currently not in stock
Standard Parts
Pedal Shaft MBK 51 / 41
Article no.: CGN4272

Pedal Shaft MBK 51 / 41

14,50 €
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
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

60,50 €
Currently not in stock
AFAM
Chain Kit Aprilia RX 50 1999 - 2001 Afam 12x51 - 420 (original gear ratio)
Article no.: AFAM32036

Chain Kit Aprilia RX 50 1999 - 2001 Afam 12x51 - 420 (original gear ratio)

56,50 €
Currently not in stock
Beta
Chain Tensioner Beta RR 50 (x1)
Article no.: OE-BET29.06201.057

Chain Tensioner Beta RR 50 (x1)

11,00 €
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

52,50 €
Currently not in stock
Voca Racing
Rear Sprocket Sherco SM-R 50cc 50 teeth - 428 Alu red
Article no.: VCR-SD450.SHO.50/RE

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

52,50 €
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

52,50 €
Currently not in stock
Voca Racing
Rear Sprocket Rieju MRT 48 teeth - 420 Voca Alu black
Article no.: VCR-SD450.MRT.48/BK

Rear Sprocket Rieju MRT 48 teeth - 420 Voca Alu black

45,00 €
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

48,00 €
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

48,00 €
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

43,00 €
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

44,00 €
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

16,50 €
Currently not in stock
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 Kit steel 13x53 Doppler Origin Rieju MRT
Article no.: CGN517747

Chain Kit steel 13x53 Doppler Origin Rieju MRT

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

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

79,00 €
Currently not in stock
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

115,00 €
Currently not in stock
Conti
Rear Sprocket bimetal red 53 teeth - 428 Conti CHR Beta RR
Article no.: CGN513620

Rear Sprocket bimetal red 53 teeth - 428 Conti CHR Beta RR

71,00 €
Currently not in stock
Moto Master
Front Sprocket Moto Master 520 13 teeth Sherco SE-F 250 / 300
Article no.: MMAST-12121543

Front Sprocket Moto Master 520 13 teeth Sherco SE-F 250 / 300

16,00 €
Currently not in stock
Moto Master
Rear Sprocket Moto Master 520 aluminium 45 teeth blue YZ / YZF
Article no.: MMAST-12112306

Rear Sprocket Moto Master 520 aluminium 45 teeth blue YZ / YZF

54,00 €
Currently not in stock
Moto Master
Rear Sprocket Moto Master 520 aluminium 48 teeth black YZ / YZF
Article no.: MMAST-12112296

Rear Sprocket Moto Master 520 aluminium 48 teeth black YZ / YZF

54,00 €
Currently not in stock
Moto Master
Rear Sprocket Moto Master 420 aluminium 55 teeth red CR 85 / CRF 150
Article no.: MMAST-12112121

Rear Sprocket Moto Master 420 aluminium 55 teeth red CR 85 / CRF 150

51,00 €
Currently not in stock
Moto Master
Rear Sprocket Moto Master 520 steel 44 teeth KX /KXF
Article no.: MMAST-12102244

Rear Sprocket Moto Master 520 steel 44 teeth KX /KXF

45,00 €
Currently not in stock
Renthal
Chain 520 R1 Works 120 links
Article no.: REN-R1520120

Chain 520 R1 Works 120 links

95,50 €
Currently not in stock
Renthal
Front Sprocket Renthal 520 Z.15 self-cleaning Kawasaki YZ 250 / YZF 450
Article no.: REN-R28952015

Front Sprocket Renthal 520 Z.15 self-cleaning Kawasaki YZ 250 / YZF 450

21,50 €
Currently not in stock
Renthal
Rear Sprocket Renthal 520 Z.51 Ultra Light self-cleaning blue YZ / YZF
Article no.: REN-12110167

Rear Sprocket Renthal 520 Z.51 Ultra Light self-cleaning blue YZ / YZF

58,50 €
Currently not in stock
Renthal
Rear Sprocket Renthal 520 Z.53 Ultra Light self-cleaning KTM / Husqvarna / GasGas
Article no.: REN-12110104

Rear Sprocket Renthal 520 Z.53 Ultra Light self-cleaning KTM / Husqvarna / GasGas

59,00 €
Currently not in stock
Renthal
Rear Sprocket Renthal 520 Z.52 Ultra Light self-cleaning black KTM / Husqvarna / GasGas
Article no.: REN-12110049

Rear Sprocket Renthal 520 Z.52 Ultra Light self-cleaning black KTM / Husqvarna / GasGas

63,00 €
Currently not in stock
Renthal
Rear Sprocket Renthal 520 Z.49 Ultra Light self-cleaning black KTM / Husqvarna / GasGas
Article no.: REN-12110046

Rear Sprocket Renthal 520 Z.49 Ultra Light self-cleaning black KTM / Husqvarna / GasGas

58,50 €
Currently not in stock
Standard Parts
Locking Washer primary gear nut Simson
Article no.: MOF-41365

Locking Washer primary gear nut Simson

0,60 €
Currently not in stock
AFAM
Front Sprocket Afam 13 teeth Beta RR LC
Article no.: 1075314001

Front Sprocket Afam 13 teeth Beta RR LC

6,30 €
Currently not in stock
AFAM
Chain Kit AFAM 17x40 Aprilia RS125 1999 - 2005 / RS 125 Tuono
Article no.: AFAMKS-A-192

Chain Kit AFAM 17x40 Aprilia RS125 1999 - 2005 / RS 125 Tuono

90,50 €
Currently not in stock
AFAM
Chain Kit AFAM 13x38 Honda TRX 250 X
Article no.: AFAMKS-A-11

Chain Kit AFAM 13x38 Honda TRX 250 X

74,50 €
Currently not in stock
AFAM
Chain Rivet Master Link AFAM reinforced gold A420 R1-G
Article no.: AFAM420R1-G

Chain Rivet Master Link AFAM reinforced gold A420 R1-G

2,00 €
Currently not in stock
Moose Racing
RXP Pro-MX 428 Chain Moose Racing
Article no.: MRM57500_MASTER

RXP Pro-MX 428 Chain Moose Racing

from 31,50 €
Currently not in stock
YCF
Chain Tensioners d.15mm Pit Bike YCF Lite
Article no.: YCF-110-1016-01

Chain Tensioners d.15mm Pit Bike YCF Lite

13,00 €
Currently not in stock
YCF
Chain Tensioners d.15mm YCF Pit Bike / Dirt Bike
Article no.: YCF-110-11-09

Chain Tensioners d.15mm YCF Pit Bike / Dirt Bike

16,50 €
Currently not in stock
YCF
Rear Sprocket steel 420 - 41 teeth - 5 screws Pit Bike YCF
Article no.: YCF-110-11-062-41

Rear Sprocket steel 420 - 41 teeth - 5 screws Pit Bike YCF

16,00 €
Currently not in stock
YCF
Rear Sprocket steel 420 - 41 teeth - 4 screws Pit Bike YCF
Article no.: YCF-110-11-06-41

Rear Sprocket steel 420 - 41 teeth - 4 screws Pit Bike YCF

16,00 €
Currently not in stock
YCF Factory
Rear Sprocket aluminium CNC 420 - 45 teeth - 4 screws YCF Pit Bike silver
Article no.: MBCA06R.45SI

Rear Sprocket aluminium CNC 420 - 45 teeth - 4 screws YCF Pit Bike silver

41,50 €
Currently not in stock
YCF Factory
Rear Sprocket aluminium CNC 420 - 39 teeth - 4 screws YCF Pit Bike red
Article no.: MBCA06R.39RD

Rear Sprocket aluminium CNC 420 - 39 teeth - 4 screws YCF Pit Bike red

41,50 €
Currently not in stock
YCF Factory
Rear Sprocket aluminium CNC 420 - 39 teeth - 4 screws YCF Pit Bike blue
Article no.: MBCA06R.39BL

Rear Sprocket aluminium CNC 420 - 39 teeth - 4 screws YCF Pit Bike blue

41,50 €
Currently not in stock
YCF Factory
Rear Sprocket aluminium CNC 420 - 39 teeth - 4 screws YCF Pit Bike silver
Article no.: MBCA06R.39SI

Rear Sprocket aluminium CNC 420 - 39 teeth - 4 screws YCF Pit Bike silver

41,50 €
Currently not in stock
YCF Factory
Rear Sprocket aluminium CNC 420 - 37 teeth - 4 screws YCF Pit Bike black
Article no.: MBCA06R.37BK

Rear Sprocket aluminium CNC 420 - 37 teeth - 4 screws YCF Pit Bike black

41,50 €
Currently not in stock
YCF Factory
Rear Sprocket aluminium CNC 420 - 37 teeth - 4 screws YCF Pit Bike blue
Article no.: MBCA06R.37BL

Rear Sprocket aluminium CNC 420 - 37 teeth - 4 screws YCF Pit Bike blue

41,50 €
Currently not in stock
YCF
Chain Guard Pit Bike YCF 50 cc
Article no.: YCF-50-0600-02

Chain Guard Pit Bike YCF 50 cc

16,50 €
Currently not in stock
Doppler
Rear Sprocket 53 teeth - 420 Doppler Alu CNC Néochrome Aprilia SX 50
Article no.: CGN505504

Rear Sprocket 53 teeth - 420 Doppler Alu CNC Néochrome Aprilia SX 50

69,50 €
Currently not in stock
Doppler
Rear Sprocket 53 teeth - 428 Doppler Alu CNC neochrome Sherco Enduro 50
Article no.: CGN505499

Rear Sprocket 53 teeth - 428 Doppler Alu CNC neochrome Sherco Enduro 50

69,50 €
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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