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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 Engine cover 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
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AFAM Algi Aprilia Avoc Beta Bidalot Buzzetti Conti CPI 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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Moto Master
Rear Sprocket Moto Master 520 Fusion 48 teeth black CR / CRF
Article no.: MMAST-12112103

Rear Sprocket Moto Master 520 Fusion 48 teeth black CR / CRF

73,50 €
Currently not in stock
Moto Master
Rear Sprocket Moto Master 520 steel 52 teeth CR / CRF
Article no.: MMAST-12102315

Rear Sprocket Moto Master 520 steel 52 teeth CR / CRF

40,50 €
Currently not in stock
Moto Master
Rear Sprocket Moto Master 520 steel 52 teeth Husqvarna CR / WR & Sherco
Article no.: MMAST-12102314

Rear Sprocket Moto Master 520 steel 52 teeth Husqvarna CR / WR & Sherco

40,50 €
Currently not in stock
Moto Master
Rear Sprocket Moto Master 520 steel 47 teeth CR / CRF
Article no.: MMAST-12102301

Rear Sprocket Moto Master 520 steel 47 teeth CR / CRF

40,50 €
Currently not in stock
Moto Master
Rear Sprocket Moto Master 420 steel 44 teeth TC / SX 65
Article no.: MMAST-12102279

Rear Sprocket Moto Master 420 steel 44 teeth TC / SX 65

45,00 €
Currently not in stock
Moto Master
Rear Sprocket Moto Master 420 steel 48 teeth KX 65
Article no.: MMAST-12102277

Rear Sprocket Moto Master 420 steel 48 teeth KX 65

45,00 €
Currently not in stock
Moto Master
Rear Sprocket Moto Master 520 steel 49 teeth YZ / YZF
Article no.: MMAST-12102268

Rear Sprocket Moto Master 520 steel 49 teeth YZ / YZF

45,00 €
Currently not in stock
Moto Master
Rear Sprocket Moto Master 520 steel 52 teeth KX /KXF
Article no.: MMAST-12102252

Rear Sprocket Moto Master 520 steel 52 teeth KX /KXF

45,00 €
Currently not in stock
Moto Master
Rear Sprocket Moto Master 520 steel 49 teeth KX /KXF
Article no.: MMAST-12102249

Rear Sprocket Moto Master 520 steel 49 teeth KX /KXF

45,00 €
Currently not in stock
Moto Master
Rear Sprocket Moto Master 428 steel 50 teeth RM / YZ 85
Article no.: MMAST-12102236

Rear Sprocket Moto Master 428 steel 50 teeth RM / YZ 85

45,00 €
Currently not in stock
Moto Master
Rear Sprocket Moto Master 520 steel 50 teeth RM / RM-Z
Article no.: MMAST-12102228

Rear Sprocket Moto Master 520 steel 50 teeth RM / RM-Z

45,00 €
Currently not in stock
Piaggio
Primary Drive Shaft Piaggio before 1995
Article no.: OE-PIA2869305

Primary Drive Shaft Piaggio before 1995

96,00 €
Currently not in stock
Hot Rods
Repair Kit gearbox output shaft Hot Rods Suzuki RM-Z 250 after 2013
Article no.: HR-OSK0049

Repair Kit gearbox output shaft Hot Rods Suzuki RM-Z 250 after 2013

27,50 €
Currently not in stock
Renthal
Front Sprocket Renthal 520 Z.12 self-cleaning Kawasaki YZ 250 / YZF 450
Article no.: REN-R28952012

Front Sprocket Renthal 520 Z.12 self-cleaning Kawasaki YZ 250 / YZF 450

22,50 €
Currently not in stock
Renthal
Rear Sprocket Renthal 520 Z.45 Ultra Light self-cleaning CR / CRF
Article no.: REN-R15445

Rear Sprocket Renthal 520 Z.45 Ultra Light self-cleaning CR / CRF

50,50 €
Currently not in stock
Renthal
Front Sprocket Renthal 520 Z.12 EC 250 / 300
Article no.: REN-12121651

Front Sprocket Renthal 520 Z.12 EC 250 / 300

29,00 €
Currently not in stock
Renthal
Front Sprocket Renthal 520 Z.13 Ultra Light self-cleaning RM-Z 250 after 2013
Article no.: REN-12121298

Front Sprocket Renthal 520 Z.13 Ultra Light self-cleaning RM-Z 250 after 2013

27,00 €
Currently not in stock
Renthal
Rear Sprocket Renthal 520 Z.51 Ultra Light self-cleaning black CR / CRF
Article no.: REN-12110033

Rear Sprocket Renthal 520 Z.51 Ultra Light self-cleaning black CR / CRF

58,50 €
Currently not in stock
Renthal
Rear Sprocket Renthal 520 Z.51 Twinring red CR / CRF
Article no.: REN-12100823

Rear Sprocket Renthal 520 Z.51 Twinring red CR / CRF

112,00 €
Currently not in stock
Schmitt
Sealing Cap drive shaft Schmitt aluminium CNC Simson
Article no.: MOF-STT42162

Sealing Cap drive shaft Schmitt aluminium CNC Simson

33,50 €
Currently not in stock
Standard Parts
Gear Selector Fork Simson
Article no.: MOF-41559

Gear Selector Fork Simson

21,50 €
Currently not in stock
Standard Parts
Spring Seat clutch pressure spring Simson
Article no.: MOF-41533

Spring Seat clutch pressure spring Simson

3,00 €
Currently not in stock
Standard Parts
Output Shaft 3-speed gearbox 9 holes Simson
Article no.: MOF-41431

Output Shaft 3-speed gearbox 9 holes Simson

37,50 €
Currently not in stock
Standard Parts
Idler Gear 39 teeth 2nd gear 3-speed Simson
Article no.: MOF-41367

Idler Gear 39 teeth 2nd gear 3-speed Simson

26,00 €
Currently not in stock
AFAM
Chain Kit Afam 428 MX 85 KX 13/54 ultra-light rear sprocket
Article no.: 48011187

Chain Kit Afam 428 MX 85 KX 13/54 ultra-light rear sprocket

119,00 €
Currently not in stock
AFAM
Chain Kit Afam 520 MR2 Husqvarna CR 125 12/50 ultra-light rear sprocket
Article no.: 48011049

Chain Kit Afam 520 MR2 Husqvarna CR 125 12/50 ultra-light rear sprocket

106,00 €
Currently not in stock
AFAM
Chain Kit Afam 420 MX CR 85 15/56
Article no.: 48010406

Chain Kit Afam 420 MX CR 85 15/56

90,00 €
Currently not in stock
AFAM
Rear Sprocket Afam steel self-cleaning 50 teeth Beta RR
Article no.: 1074641003

Rear Sprocket Afam steel self-cleaning 50 teeth Beta RR

48,50 €
Currently not in stock
AFAM
Rear Sprocket Afam steel self-cleaning 49 teeth Beta RR
Article no.: 1074641002

Rear Sprocket Afam steel self-cleaning 49 teeth Beta RR

48,50 €
Currently not in stock
AFAM
Rear Sprocket Afam steel self-cleaning 48 teeth Beta RR
Article no.: 1074641001

Rear Sprocket Afam steel self-cleaning 48 teeth Beta RR

48,00 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium 428 / 50 teeth CR 80 / 85
Article no.: 1074386002

Rear Sprocket Afam aluminium 428 / 50 teeth CR 80 / 85

41,00 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium 428 / 53 teeth RM / YZ 85
Article no.: 1074533008

Rear Sprocket Afam aluminium 428 / 53 teeth RM / YZ 85

46,50 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium 42 teeth KTM / Husqvarna
Article no.: 1074736009

Rear Sprocket Afam aluminium 42 teeth KTM / Husqvarna

43,00 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium 420 / 52 teeth CR 80 / 85
Article no.: 1074384004

Rear Sprocket Afam aluminium 420 / 52 teeth CR 80 / 85

41,00 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium 46 teeth KTM / Husqvarna
Article no.: 1074736013

Rear Sprocket Afam aluminium 46 teeth KTM / Husqvarna

45,00 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium self-cleaning 428 / 53 teeth RM / YZ 85
Article no.: 1074532007

Rear Sprocket Afam aluminium self-cleaning 428 / 53 teeth RM / YZ 85

54,50 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium 420 / 56 teeth CR 80 / 85
Article no.: 1074384007

Rear Sprocket Afam aluminium 420 / 56 teeth CR 80 / 85

44,50 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium 428 / 49 teeth CR 80 / 85
Article no.: 1074386001

Rear Sprocket Afam aluminium 428 / 49 teeth CR 80 / 85

41,00 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium 46 teeth Kawasaki KX / KXF
Article no.: 1074600001

Rear Sprocket Afam aluminium 46 teeth Kawasaki KX / KXF

50,50 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium self-cleaning 54 teeth Yamaha YZ / YZF
Article no.: 1074470008

Rear Sprocket Afam aluminium self-cleaning 54 teeth Yamaha YZ / YZF

60,50 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium 420 / 55 teeth KX 80 / 85
Article no.: 1074595006

Rear Sprocket Afam aluminium 420 / 55 teeth KX 80 / 85

47,00 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium 428 / 55 teeth KX 80 / 85
Article no.: 1074597004

Rear Sprocket Afam aluminium 428 / 55 teeth KX 80 / 85

48,50 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium self-cleaning 53 teeth Suzuki RM-Z 250 / 450
Article no.: 1074536007

Rear Sprocket Afam aluminium self-cleaning 53 teeth Suzuki RM-Z 250 / 450

59,50 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium self-cleaning 47 teeth Suzuki RM-Z 250 / 450
Article no.: 1074536001

Rear Sprocket Afam aluminium self-cleaning 47 teeth Suzuki RM-Z 250 / 450

49,50 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium 53T self-cleaning 420 / CR 80 / 85
Article no.: 1074384005

Rear Sprocket Afam aluminium 53T self-cleaning 420 / CR 80 / 85

41,00 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium self-cleaning 46 teeth KX 65
Article no.: 1074598001

Rear Sprocket Afam aluminium self-cleaning 46 teeth KX 65

40,00 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium self-cleaning 420 / 53 teeth KX 80 / 85
Article no.: 1074595004

Rear Sprocket Afam aluminium self-cleaning 420 / 53 teeth KX 80 / 85

48,50 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium self-cleaning 428 / 46 teeth RM / YZ 85
Article no.: 1074533001

Rear Sprocket Afam aluminium self-cleaning 428 / 46 teeth RM / YZ 85

40,00 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium self-cleaning 428 / 54 teeth KX 80 / 85
Article no.: 1074597003

Rear Sprocket Afam aluminium self-cleaning 428 / 54 teeth KX 80 / 85

48,00 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium self-cleaning 420 / 52 teeth KX 80 / 85
Article no.: 1074596004

Rear Sprocket Afam aluminium self-cleaning 420 / 52 teeth KX 80 / 85

41,00 €
Currently not in stock
AFAM
Rear Sprocket Afam aluminium self-cleaning 53 teeth Kawasaki KX / KXF
Article no.: 1074602004

Rear Sprocket Afam aluminium self-cleaning 53 teeth Kawasaki KX / KXF

51,50 €
Currently not in stock
AFAM
Front Sprocket Afam self-cleaning 420 / 12 teeth SX / TC 65
Article no.: 1077161001

Front Sprocket Afam self-cleaning 420 / 12 teeth SX / TC 65

12,50 €
Currently not in stock
AFAM
Front Sprocket Afam self-cleaning 428 / 12 teeth TC / SX 85
Article no.: 1077168002

Front Sprocket Afam self-cleaning 428 / 12 teeth TC / SX 85

12,50 €
Currently not in stock
AFAM
Front Sprocket Afam 12 teeth Husqvarna CR / WR 125 1991-1994
Article no.: 1076875001

Front Sprocket Afam 12 teeth Husqvarna CR / WR 125 1991-1994

18,00 €
Currently not in stock
AFAM
Front Sprocket Afam 10 teeth Kawasaki / Yamaha
Article no.: 1076710001

Front Sprocket Afam 10 teeth Kawasaki / Yamaha

14,50 €
Currently not in stock
AFAM
Front Sprocket Afam 14 teeth KX 125
Article no.: 1076688004

Front Sprocket Afam 14 teeth KX 125

15,50 €
Currently not in stock
AFAM
Front Sprocket Afam 16 teeth CR 80 / 85
Article no.: 1074512003

Front Sprocket Afam 16 teeth CR 80 / 85

9,60 €
Currently not in stock
AFAM
Chain Master Link (rivet) Afam A415GPR-G gold
Article no.: 1047744

Chain Master Link (rivet) Afam A415GPR-G gold

3,20 €
Currently not in stock
AFAM
Chain Afam A415GPR-G 126 links
Article no.: 1077250002

Chain Afam A415GPR-G 126 links

90,00 €
Currently not in stock
AFAM
Chain Kit AFAM XS-Ring extra reinforced 15x49 Aprilia RX125 2008 - 2010
Article no.: AFAMKS-A-186

Chain Kit AFAM XS-Ring extra reinforced 15x49 Aprilia RX125 2008 - 2010

116,00 €
Currently not in stock
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44454647484950

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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