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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
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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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Str8
Chain Tensioner STR8 Sherco 50 Purple (x2)
Article no.: STR-740.05/PU

Chain Tensioner STR8 Sherco 50 Purple (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Sherco 50 Red (x2)
Article no.: STR-740.05/RE

Chain Tensioner STR8 Sherco 50 Red (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Sherco 50 Blue (x2)
Article no.: STR-740.05/BL

Chain Tensioner STR8 Sherco 50 Blue (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Sherco 50 Black (x2)
Article no.: STR-740.05/BK

Chain Tensioner STR8 Sherco 50 Black (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Beta RR 50 Neochrome (x2)
Article no.: STR-740.04/NC

Chain Tensioner STR8 Beta RR 50 Neochrome (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Beta RR 50 Gold (x2)
Article no.: STR-740.04/OR

Chain Tensioner STR8 Beta RR 50 Gold (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Beta RR 50 Purple (x2)
Article no.: STR-740.04/PU

Chain Tensioner STR8 Beta RR 50 Purple (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Beta RR 50 Red (x2)
Article no.: STR-740.04/RE

Chain Tensioner STR8 Beta RR 50 Red (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Beta RR 50 Blue (x2)
Article no.: STR-740.04/BL

Chain Tensioner STR8 Beta RR 50 Blue (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Beta RR 50 Black (x2)
Article no.: STR-740.04/BK

Chain Tensioner STR8 Beta RR 50 Black (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Rieju MRT Neochrome (x2)
Article no.: STR-740.03/NC

Chain Tensioner STR8 Rieju MRT Neochrome (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Rieju MRT Gold (x2)
Article no.: STR-740.03/OR

Chain Tensioner STR8 Rieju MRT Gold (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Rieju MRT Purple (x2)
Article no.: STR-740.03/PU

Chain Tensioner STR8 Rieju MRT Purple (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Rieju MRT Red (x2)
Article no.: STR-740.03/RE

Chain Tensioner STR8 Rieju MRT Red (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Rieju MRT Blue (x2)
Article no.: STR-740.03/BL

Chain Tensioner STR8 Rieju MRT Blue (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Rieju MRT Black (x2)
Article no.: STR-740.03/BK

Chain Tensioner STR8 Rieju MRT Black (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Derbi 15mm Neochrome (x2)
Article no.: STR-740.02/NC

Chain Tensioner STR8 Derbi 15mm Neochrome (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Derbi 15mm Gold (x2)
Article no.: STR-740.02/OR

Chain Tensioner STR8 Derbi 15mm Gold (x2)

20,00 €
In stock
Str8
Chain Tensioner STR8 Derbi 15mm Purple (x2)
Article no.: STR-740.02/PU

Chain Tensioner STR8 Derbi 15mm Purple (x2)

20,00 €
In stock
Str8
Chain Tensioner STR8 Derbi 15mm Red (x2)
Article no.: STR-740.02/RE

Chain Tensioner STR8 Derbi 15mm Red (x2)

20,00 €
In stock
Str8
Chain Tensioner STR8 Derbi 15mm Blue (x2)
Article no.: STR-740.02/BL

Chain Tensioner STR8 Derbi 15mm Blue (x2)

20,00 €
In stock
Str8
Chain Tensioner STR8 Derbi 15mm Black (x2)
Article no.: STR-740.02/BK

Chain Tensioner STR8 Derbi 15mm Black (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Derbi 12mm Neochrome (x2)
Article no.: STR-740.01/NC

Chain Tensioner STR8 Derbi 12mm Neochrome (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Derbi 12mm Gold (x2)
Article no.: STR-740.01/OR

Chain Tensioner STR8 Derbi 12mm Gold (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Derbi 12mm Purple (x2)
Article no.: STR-740.01/PU

Chain Tensioner STR8 Derbi 12mm Purple (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Derbi 12mm Red (x2)
Article no.: STR-740.01/RE

Chain Tensioner STR8 Derbi 12mm Red (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Derbi 12mm Blue (x2)
Article no.: STR-740.01/BL

Chain Tensioner STR8 Derbi 12mm Blue (x2)

20,00 €
In stock
New
Str8
Chain Tensioner STR8 Derbi 12mm black (x2)
Article no.: STR-740.01/BK

Chain Tensioner STR8 Derbi 12mm black (x2)

20,00 €
In stock
New
Polini
Primary Gears Polini 14/35 Piaggio Zip 4T Euro 4/5
Article no.: P202.1429

Primary Gears Polini 14/35 Piaggio Zip 4T Euro 4/5

107,00 €
In stock
RRP
119,00 €
-10% Discount
Voca Racing
Rear Sprocket 40 teeth - 420 Voca Alu Neochrome Yamaha DT 50 LC Portugal
Article no.: VCR-SD450.YDT.40/TI

Rear Sprocket 40 teeth - 420 Voca Alu Neochrome Yamaha DT 50 LC Portugal

39,00 €
In stock
Sale
Voca Racing
Rear Sprocket 40 teeth - 420 Voca Alu Red Yamaha DT 50 LC Portugal
Article no.: VCR-SD450.YDT.40/RE

Rear Sprocket 40 teeth - 420 Voca Alu Red Yamaha DT 50 LC Portugal

36,00 €
In stock
Sale
Str8
Clutch Cable Holder Derbi STR8 Green
Article no.: STR-021.03/GR

Clutch Cable Holder Derbi STR8 Green

5,00 €
In stock
Top Performances
Secondary Gears 13/42 Top Performances Minarelli
Article no.: TCI07452

Secondary Gears 13/42 Top Performances Minarelli

53,00 €
In stock
Sale
Doppler
Rear Sprocket 53 teeth - 420 Doppler aluminium CNC purple Rieju MRT
Article no.: CGN533905

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

45,00 €
In stock
Sale
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

54,00 €
In stock
55,00 €
-2% Discount
Sale
Standard Parts
Chain Tensioner Puch Maxi
Article no.: MOF-44133

Chain Tensioner Puch Maxi

8,30 €
In stock
8,40 €
-1% Discount
Standard Parts
Chain Guard reinforced Derbi Senda / Aprilia SX / Gilera SMT black
Article no.: STR-730.10/BK

Chain Guard reinforced Derbi Senda / Aprilia SX / Gilera SMT black

32,00 €
In stock
Standard Parts
Chain Guard reinforced Beta RR 50 / 125 aluminium black
Article no.: STR-730.12/BK

Chain Guard reinforced Beta RR 50 / 125 aluminium black

48,00 €
In stock
Standard Parts
Rear Sprocket Premium 60 teeth 428 Vent Derapage / Baja 50 Euro 5
Article no.: SP-52651

Rear Sprocket Premium 60 teeth 428 Vent Derapage / Baja 50 Euro 5

62,00 €
In stock
Standard Parts
Rear Sprocket steel 62 teeth 420 CPI SM
Article no.: MF89.00374

Rear Sprocket steel 62 teeth 420 CPI SM

27,00 €
In stock
Standard Parts
Chain Tensioner Set 12mm aluminium Puch / Simson / Kreidler / Sachs red
Article no.: MOF-43010/RE

Chain Tensioner Set 12mm aluminium Puch / Simson / Kreidler / Sachs red

9,40 €
In stock
Standard Parts
Chain Tensioner Set 12mm aluminium Puch / Simson / Kreidler / Sachs blue
Article no.: MOF-43010/BL

Chain Tensioner Set 12mm aluminium Puch / Simson / Kreidler / Sachs blue

9,70 €
In stock
Standard Parts
Rear Sprocket 48 teeth Peugeot 101 / 102
Article no.: CGN534531

Rear Sprocket 48 teeth Peugeot 101 / 102

17,00 €
In stock
AFAM
Chain Kit Sherco SE-R 50 Afam 14x56 - 428
Article no.: AFAM173014

Chain Kit Sherco SE-R 50 Afam 14x56 - 428

66,00 €
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 €
In stock
AFAM
Chain Kit Aprilia SX 50 2012 - 2017 Afam 11x53 - 420 (original gear ratio)
Article no.: AFAM167783

Chain Kit Aprilia SX 50 2012 - 2017 Afam 11x53 - 420 (original gear ratio)

60,00 €
In stock
AFAM
Chain Kit Aprilia RX 50 2006 - 2017 Afam 11x53 - 420 (original gear ratio)
Article no.: AFAM31761

Chain Kit Aprilia RX 50 2006 - 2017 Afam 11x53 - 420 (original gear ratio)

55,00 €
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)

60,00 €
In stock
AFAM
Chain Kit Aprilia RX 2002 - 2006 Afam 11x51 - 420 original ratio
Article no.: AFAM31760

Chain Kit Aprilia RX 2002 - 2006 Afam 11x51 - 420 original ratio

56,00 €
In stock
AFAM
Chain Kit Aprilia RS 50 2003 - 2005 Afam 11x47 - 420 (original gear ratio)
Article no.: AFAM4304

Chain Kit Aprilia RS 50 2003 - 2005 Afam 11x47 - 420 (original gear ratio)

64,50 €
In stock
AFAM
Chain Kit Aprilia MX / SM 50 2003 - 2005 Afam 11x51 - 420 (original gear ratio)
Article no.: AFAM32035

Chain Kit Aprilia MX / SM 50 2003 - 2005 Afam 11x51 - 420 (original gear ratio)

59,50 €
In stock
Standard Parts
Gear Selector Fork left secondary shaft AM6 Generic / CPI
Article no.: MF60.19507

Gear Selector Fork left secondary shaft AM6 Generic / CPI

16,00 €
In stock
Standard Parts
Gear Selector Fork right secondary shaft type AM6 Generic / CPI / KSR
Article no.: MF60.19506

Gear Selector Fork right secondary shaft type AM6 Generic / CPI / KSR

16,00 €
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

16,00 €
In stock
AFAM
Rear Sprocket steel Sherco HRD Afam 56 teeth - 428
Article no.: AFAM160814

Rear Sprocket steel Sherco HRD Afam 56 teeth - 428

57,00 €
In stock
Sale
AFAM
Rear Sprocket steel Sherco Enduro 50 Afam 47 teeth - 428
Article no.: AFAM160817

Rear Sprocket steel Sherco Enduro 50 Afam 47 teeth - 428

26,50 €
In stock
AFAM
Rear Sprocket steel Peugeot / Rieju Afam 60 teeth - 420
Article no.: AFAM167819

Rear Sprocket steel Peugeot / Rieju Afam 60 teeth - 420

37,00 €
In stock
AFAM
Rear Sprocket steel Honda Monkey Z50 Afam 33 teeth - 420
Article no.: AFAM178952

Rear Sprocket steel Honda Monkey Z50 Afam 33 teeth - 420

14,00 €
In stock
16,50 €
-15% Discount
Sale
AFAM
Rear Sprocket steel Beta RR 50 Afam 60 teeth - 420
Article no.: AFAM167786

Rear Sprocket steel Beta RR 50 Afam 60 teeth - 420

28,50 €
In stock
Str8
Clutch Cable Holder Derbi STR8 Black
Article no.: STR-021.03/BK

Clutch Cable Holder Derbi STR8 Black

4,60 €
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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