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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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Standard Parts
Swingarm Slider Rieju MRT
Article no.: MF89.00185

Swingarm Slider Rieju MRT

12,00 €
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
Standard Parts
Gear Selector Fork primary shaft AM6 Generic / CPI / KSR
Article no.: MF60.19505

Gear Selector Fork primary shaft AM6 Generic / CPI / KSR

16,50 €
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 Generic Trigger Afam 50 teeth - 420
Article no.: AFAM160795

Rear Sprocket steel Generic Trigger Afam 50 teeth - 420

24,50 €
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
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 Sherco SM-R 50cc 53 teeth - 428 Alu black
Article no.: VCR-SD450.SHO.53/BK

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

55,00 €
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 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 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 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
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

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

Rear Sprocket Aprilia SX 50cc 50 teeth - 420 Voca Alu black

49,00 €
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
Doppler
Chain Kit Doppler 13x53 - 428 Sherco 50 Alu Black
Article no.: CGN526754

Chain Kit Doppler 13x53 - 428 Sherco 50 Alu Black

102,00 €
Currently not in stock
Doppler
Chain Kit Doppler 13x53 - 428 Sherco 50 Alu Neochrome
Article no.: CGN526755

Chain Kit Doppler 13x53 - 428 Sherco 50 Alu Neochrome

112,00 €
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
Rear Sprocket Doppler 53 teeth - 428 aluminum black Sherco 50
Article no.: CGN517733

Rear Sprocket Doppler 53 teeth - 428 aluminum black Sherco 50

69,50 €
Currently not in stock
Doppler
Rear Sprocket Doppler 53 teeth - 428 aluminum blue Sherco 50
Article no.: CGN517734

Rear Sprocket Doppler 53 teeth - 428 aluminum blue Sherco 50

69,50 €
Currently not in stock
Standard Parts
Rear Sprocket Premium 58 teeth - 420 black Fantic XM50 / XE50 after 2018
Article no.: IP49517

Rear Sprocket Premium 58 teeth - 420 black Fantic XM50 / XE50 after 2018

45,00 €
Currently not in stock
Standard Parts
Rear Sprocket 53 teeth - 420 Doppler Masai Rider 50
Article no.: CGN517184

Rear Sprocket 53 teeth - 420 Doppler Masai Rider 50

57,00 €
Currently not in stock
RFX
Chain Roller RFX Race green 38mm Kawasaki KXF 250 / 450
Article no.: R-FXCR2010055GN

Chain Roller RFX Race green 38mm Kawasaki KXF 250 / 450

12,00 €
Currently not in stock
Standard Parts
Spacer idle gear 24x35x1,0mm gearbox Simson
Article no.: MOF-41496

Spacer idle gear 24x35x1,0mm gearbox Simson

1,20 €
Currently not in stock
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
Voca Racing
Gearbox Voca Racing Derbi
Article no.: VCR-RD77193.CC

Gearbox Voca Racing Derbi

522,00 €
Currently not in stock
RRP
570,00 €
-8% Discount
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

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
Doppler
Chain Kit steel 13x53 - 420 Doppler Origin Yamaha TZR 50
Article no.: CGN515038

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

79,00 €
Currently not in stock
Doppler
Chain Kit steel 13x53 - 420 Doppler Origin Beta RR
Article no.: CGN515036

Chain Kit steel 13x53 - 420 Doppler Origin Beta RR

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
Doppler
Rear Sprocket 68 teeth Doppler aluminium CNC black MBK 51 / Peugeot 103
Article no.: CGN513527

Rear Sprocket 68 teeth Doppler aluminium CNC black MBK 51 / Peugeot 103

52,00 €
Currently not in stock
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
Standard Parts
Chain Kit Afam 12x58 - 420 Fantic Caballero 2006 - 2017
Article no.: CGN509298

Chain Kit Afam 12x58 - 420 Fantic Caballero 2006 - 2017

74,00 €
Currently not in stock
Standard Parts
Rear Sprocket steel 52 teeth - 420 CPI SX / SM
Article no.: MF89.00371

Rear Sprocket steel 52 teeth - 420 CPI SX / SM

25,00 €
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 48 teeth YZ / YZF
Article no.: MMAST-12102267

Rear Sprocket Moto Master 520 steel 48 teeth YZ / YZF

45,00 €
Currently not in stock
Moto Master
Rear Sprocket Moto Master 520 steel 42 teeth YZ / YZF
Article no.: MMAST-12102261

Rear Sprocket Moto Master 520 steel 42 teeth YZ / YZF

44,50 €
Currently not in stock
45,00 €
-1% Discount
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
Doppler
Chain Tensioner wheel axle 15mm Doppler Alu CNC black Derbi / Gilera / Aprilia
Article no.: CGN508645

Chain Tensioner wheel axle 15mm Doppler Alu CNC black Derbi / Gilera / Aprilia

25,50 €
Currently not in stock
Doppler
Chain Tensioner wheel axle 12mm Doppler Alu CNC red Derbi / Gilera / Aprilia
Article no.: CGN508640

Chain Tensioner wheel axle 12mm Doppler Alu CNC red Derbi / Gilera / Aprilia

25,50 €
Currently not in stock
Doppler
Chain Tensioner wheel axle 12mm Doppler Alu CNC blue Derbi / Gilera / Aprilia
Article no.: CGN508643

Chain Tensioner wheel axle 12mm Doppler Alu CNC blue Derbi / Gilera / Aprilia

25,50 €
Currently not in stock
Doppler
Front Sprocket Doppler - 428 Black coating Minarelli AM6
Article no.: CGN428NOIRAM6

Front Sprocket Doppler - 428 Black coating Minarelli AM6

from 8,00 €
Currently not in stock
12,50 €
-36% Discount
Polini
Primary Gears Polini 13/44 Yamaha Aerox / BW's
Article no.: P202.1370
1

Primary Gears Polini 13/44 Yamaha Aerox / BW's

79,50 €
Currently not in stock
Polini
Secondary Gears Polini 15/42 Minarelli 15/42 1:280
Article no.: P202.1346
3

Secondary Gears Polini 15/42 Minarelli 15/42 1:280

79,50 €
Currently not in stock
Buzzetti
Chain Tensioner Buzzetti Gilera EC1 / Piaggio / Vespa Ciao
Article no.: WB-30429

Chain Tensioner Buzzetti Gilera EC1 / Piaggio / Vespa Ciao

10,50 €
Currently not in stock
Doppler
Primary Gears Doppler 13/43 Yamaha Aerox / BW's
Article no.: CGN283937
4

Primary Gears Doppler 13/43 Yamaha Aerox / BW's

79,00 €
Currently not in stock
Renthal
Chain 420 R1 Works 120 links
Article no.: REN-R1420120

Chain 420 R1 Works 120 links

37,00 €
Currently not in stock
Renthal
Rear Sprocket Renthal 520 Z.42 Ultra Light self-cleaning orange KTM / Husqvarna / GasGas
Article no.: REN-12112469

Rear Sprocket Renthal 520 Z.42 Ultra Light self-cleaning orange KTM / Husqvarna / GasGas

55,50 €
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.45 Ultra Light self-cleaning KTM / Husqvarna / GasGas
Article no.: REN-12110078

Rear Sprocket Renthal 520 Z.45 Ultra Light self-cleaning KTM / Husqvarna / GasGas

50,50 €
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
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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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