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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
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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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Moto Master
Rear Sprocket Moto Master 520 steel 50 teeth KX /KXF
Article no.: MMAST-12102250

Rear Sprocket Moto Master 520 steel 50 teeth KX /KXF

36,00 €
In stock
RRP
45,00 €
-20% Discount
Moto Master
Rear Sprocket Moto Master 428 steel 53 teeth RM / YZ 85
Article no.: MMAST-12102239

Rear Sprocket Moto Master 428 steel 53 teeth RM / YZ 85

45,00 €
In stock
Moto Master
Rear Sprocket Moto Master 520 steel 51 teeth RM / RM-Z
Article no.: MMAST-12102229

Rear Sprocket Moto Master 520 steel 51 teeth RM / RM-Z

45,00 €
In stock
Doppler
Chain Tensioner wheel axle 15mm Doppler Alu CNC red Derbi / Gilera / Aprilia
Article no.: CGN508644

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

25,50 €
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 €
In stock
Doppler
Chain Tensioner wheel axle 15mm Doppler Alu CNC blue Derbi / Gilera / Aprilia
Article no.: CGN508647

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

25,50 €
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 €
In stock
Doppler
Chain Tensioner wheel axle 12mm Doppler Alu CNC gold Derbi / Gilera / Aprilia
Article no.: CGN508642

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

23,00 €
In stock
25,50 €
-10% Discount
Sale
Doppler
Chain Tensioner wheel axle 12mm Doppler Alu CNC black Derbi / Gilera / Aprilia
Article no.: CGN508641

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

23,00 €
In stock
Sale
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

23,00 €
In stock
Sale
Doppler
Front Sprocket Doppler - 428 Neochrome Minarelli AM6
Article no.: CGN428NEOAM6

Front Sprocket Doppler - 428 Neochrome Minarelli AM6

12,50 €
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 €
In stock
12,50 €
-36% Discount
Doppler
Front Sprocket Doppler - 420 Neochrome Minarelli AM6
Article no.: CGN420NEOAM6

Front Sprocket Doppler - 420 Neochrome Minarelli AM6

from 11,00 €
In stock
Doppler
Front Sprocket Doppler - 420 Neochrome Derbi
Article no.: CGN420NEODERBI

Front Sprocket Doppler - 420 Neochrome Derbi

from 11,00 €
In stock
Doppler
Front Sprocket Doppler - 420 Black coating Minarelli AM6
Article no.: CGN420NOIRAM6

Front Sprocket Doppler - 420 Black coating Minarelli AM6

11,00 €
In stock
Doppler
Front Sprocket Doppler - 420 Black coating Derbi
Article no.: CGN420NOIRDERBI

Front Sprocket Doppler - 420 Black coating Derbi

from 11,00 €
In stock
Doppler
Rear Sprocket 53 teeth - 428 Doppler black steel Sherco Enduro 50
Article no.: CGN509881

Rear Sprocket 53 teeth - 428 Doppler black steel Sherco Enduro 50

34,50 €
In stock
Doppler
Rear Sprocket 53 teeth - 428 Doppler aluminium CNC blue Sherco Enduro 50
Article no.: CGN508243

Rear Sprocket 53 teeth - 428 Doppler aluminium CNC blue Sherco Enduro 50

57,00 €
In stock
Sale
Doppler
Rear Sprocket 53 teeth - 420 Doppler aluminium CNC blue Rieju MRT
Article no.: CGN508244

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

54,50 €
In stock
Polini
Primary Gears Polini 13/40 Piaggio NRG after 1998
Article no.: P202.1378
3

Primary Gears Polini 13/40 Piaggio NRG after 1998

80,00 €
In stock
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 €
In stock
Polini
Secondary Gears Polini 16/44 Peugeot Speedfight / Ludix
Article no.: P202.1352
2

Secondary Gears Polini 16/44 Peugeot Speedfight / Ludix

76,50 €
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 €
In stock
Polini
Secondary Gears Polini 14/41 Yamaha Aerox / BW's
Article no.: P202.1321
6

Secondary Gears Polini 14/41 Yamaha Aerox / BW's

79,50 €
In stock
Malossi
Secondary Transmission Malossi 17/37 Piaggio X9 250cc
Article no.: M679983

Secondary Transmission Malossi 17/37 Piaggio X9 250cc

50,50 €
In stock
RRP
101,00 €
-50% Discount
Malossi
Primary Transmission Malossi 14/42 Atala Hacker
Article no.: M677149

Primary Transmission Malossi 14/42 Atala Hacker

68,00 €
In stock
Malossi
Primary Transmission Malossi 15/40 Suzuki
Article no.: M6711297

Primary Transmission Malossi 15/40 Suzuki

107,00 €
In stock
RRP
154,00 €
-31% Discount
Malossi
Secondary Transmission Malossi 17/41 Honda Pantheon 125-150cc
Article no.: M6711060

Secondary Transmission Malossi 17/41 Honda Pantheon 125-150cc

54,50 €
In stock
RRP
109,00 €
-50% Discount
Polini
Secondary Gears Polini 14/48 Piaggio NRG after 1998
Article no.: P202.1404

Secondary Gears Polini 14/48 Piaggio NRG after 1998

88,00 €
In stock
90,50 €
-3% Discount
Sale
Hot Rods
Repair Kit gearbox output shaft Hot Rods Yamaha WRF 450 / YZF 450
Article no.: HR-OSK0040

Repair Kit gearbox output shaft Hot Rods Yamaha WRF 450 / YZF 450

25,50 €
In stock
AFAM
Rear Sprocket 52 teeth - 420 Afam Aprilia SX 50
Article no.: A264720

Rear Sprocket 52 teeth - 420 Afam Aprilia SX 50

22,00 €
In stock
Sale
Buzzetti
Chain Tensioner Buzzetti Gilera EC1 / Piaggio / Vespa Ciao
Article no.: WB-30429

Chain Tensioner Buzzetti Gilera EC1 / Piaggio / Vespa Ciao

10,50 €
In stock
Buzzetti
Woodruff Key clutch basket Buzzetti 10x3x3mm APE / Vespa
Article no.: WB-30423

Woodruff Key clutch basket Buzzetti 10x3x3mm APE / Vespa

1,70 €
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 €
In stock
Malossi
Secondary Transmission Malossi 16/42 Gilera Runner 125-200cc 4-stroke
Article no.: M6711860

Secondary Transmission Malossi 16/42 Gilera Runner 125-200cc 4-stroke

107,00 €
In stock
Renthal
Chain Master Link R1 428
Article no.: REN-R1428ML

Chain Master Link R1 428

2,40 €
In stock
Renthal
Chain 420 R1 Works 120 links
Article no.: REN-R1420120

Chain 420 R1 Works 120 links

37,00 €
In stock
Renthal
Chain Master Link R1 415
Article no.: REN-12250550

Chain Master Link R1 415

2,10 €
In stock
Renthal
Chain Master Link R3-3 520
Article no.: REN-12250467

Chain Master Link R3-3 520

4,50 €
In stock
Renthal
Chain R3-3 520 Off Road 118 links
Article no.: REN-12240205

Chain R3-3 520 Off Road 118 links

125,00 €
In stock
Renthal
Front Sprocket Renthal 520 Z.13 self-cleaning Kawasaki KX 125
Article no.: REN-R33752013

Front Sprocket Renthal 520 Z.13 self-cleaning Kawasaki KX 125

21,50 €
In stock
Renthal
Front Sprocket Renthal 520 Z.12 self-cleaning Kawasaki KX 125
Article no.: REN-R33752012

Front Sprocket Renthal 520 Z.12 self-cleaning Kawasaki KX 125

22,50 €
In stock
Renthal
Front Sprocket Renthal 428 Z.14 self-cleaning YZ 85
Article no.: REN-R25742814

Front Sprocket Renthal 428 Z.14 self-cleaning YZ 85

21,00 €
In stock
Renthal
Front Sprocket Renthal 520 Z.13 self-cleaning RM 250 / DR-Z 400
Article no.: REN-R25552013

Front Sprocket Renthal 520 Z.13 self-cleaning RM 250 / DR-Z 400

25,00 €
In stock
Renthal
Front Sprocket Renthal 520 Z.14 self-cleaning CR 250 / CRF 450
Article no.: REN-R25352014

Front Sprocket Renthal 520 Z.14 self-cleaning CR 250 / CRF 450

25,00 €
In stock
Renthal
Rear Sprocket Renthal 520 Z.48 Ultra Light self-cleaning KTM / Husqvarna / GasGas
Article no.: REN-R22448

Rear Sprocket Renthal 520 Z.48 Ultra Light self-cleaning KTM / Husqvarna / GasGas

54,50 €
In stock
Renthal
Rear Sprocket Renthal 520 Z.53 Ultra Light self-cleaning CR / CRF
Article no.: REN-R15453

Rear Sprocket Renthal 520 Z.53 Ultra Light self-cleaning CR / CRF

59,00 €
In stock
Renthal
Rear Sprocket Renthal 520 Z.50 Ultra Light self-cleaning RM / RM-Z
Article no.: REN-R12350

Rear Sprocket Renthal 520 Z.50 Ultra Light self-cleaning RM / RM-Z

54,50 €
In stock
Renthal
Front Sprocket Renthal 520 Z.12 CR / WR 250
Article no.: REN-12121674

Front Sprocket Renthal 520 Z.12 CR / WR 250

18,00 €
In stock
Renthal
Front Sprocket Renthal 520 Z.15 self-cleaning RM 250 / DR-Z 400
Article no.: REN-12121661

Front Sprocket Renthal 520 Z.15 self-cleaning RM 250 / DR-Z 400

25,00 €
In stock
Renthal
Front Sprocket Renthal 520 Z.13 Ultra Light KXF 450
Article no.: REN-12121638

Front Sprocket Renthal 520 Z.13 Ultra Light KXF 450

27,00 €
In stock
Renthal
Front Sprocket Renthal 520 Z.13 Ultra Light KXF 450
Article no.: REN-12121603

Front Sprocket Renthal 520 Z.13 Ultra Light KXF 450

28,00 €
In stock
Renthal
Front Sprocket Renthal 520 Z.11 KTM / Husqvarna / Beta
Article no.: REN-12121300

Front Sprocket Renthal 520 Z.11 KTM / Husqvarna / Beta

22,50 €
In stock
Renthal
Front Sprocket Renthal 520 Z.14 self-cleaning YZ / YZF
Article no.: REN-12120992

Front Sprocket Renthal 520 Z.14 self-cleaning YZ / YZF

21,50 €
In stock
Renthal
Front Sprocket Renthal 415 Z.11 TC / SX 50
Article no.: REN-12120826

Front Sprocket Renthal 415 Z.11 TC / SX 50

28,00 €
In stock
Renthal
Rear Sprocket Renthal 520 Z.53 Ultra Light self-cleaning orange KTM / Husqvarna / GasGas
Article no.: REN-12112479

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

63,00 €
In stock
Renthal
Rear Sprocket Renthal 520 Z.44 Ultra Light self-cleaning orange KTM / Husqvarna / GasGas
Article no.: REN-12112470

Rear Sprocket Renthal 520 Z.44 Ultra Light self-cleaning orange KTM / Husqvarna / GasGas

55,50 €
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 €
In stock
Renthal
Rear Sprocket Renthal 420 Z.50 Ultra Light self-cleaning orange TC / SX 65
Article no.: REN-12112468

Rear Sprocket Renthal 420 Z.50 Ultra Light self-cleaning orange TC / SX 65

27,50 €
In stock
RRP
55,50 €
-50% Discount
Renthal
Rear Sprocket Renthal 420 Z.51 Ultra Light self-cleaning green KX 80 / 85
Article no.: REN-12111680

Rear Sprocket Renthal 420 Z.51 Ultra Light self-cleaning green KX 80 / 85

55,50 €
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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