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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 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 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 aluminium 53 teeth black YZ / YZF
Article no.: MMAST-12112301

Rear Sprocket Moto Master 520 aluminium 53 teeth black YZ / YZF

54,00 €
In stock
Sale
Moto Master
Rear Sprocket Moto Master 520 aluminium 52 teeth black YZ / YZF
Article no.: MMAST-12112300

Rear Sprocket Moto Master 520 aluminium 52 teeth black YZ / YZF

44,00 €
In stock
Sale
Moto Master
Rear Sprocket Moto Master 520 aluminium 50 teeth black YZ / YZF
Article no.: MMAST-12112298

Rear Sprocket Moto Master 520 aluminium 50 teeth black YZ / YZF

45,00 €
In stock
49,00 €
-8% Discount
Sale
Moto Master
Rear Sprocket Moto Master 520 aluminium 47 teeth black YZ / YZF
Article no.: MMAST-12112295

Rear Sprocket Moto Master 520 aluminium 47 teeth black YZ / YZF

45,00 €
In stock
Sale
Moto Master
Rear Sprocket Moto Master 428 Fusion 47 teeth black TC / SX 85
Article no.: MMAST-12112275

Rear Sprocket Moto Master 428 Fusion 47 teeth black TC / SX 85

65,50 €
In stock
Moto Master
Rear Sprocket Moto Master 428 aluminium 49 teeth black TC / SX 85
Article no.: MMAST-12112257

Rear Sprocket Moto Master 428 aluminium 49 teeth black TC / SX 85

54,00 €
In stock
Moto Master
Rear Sprocket Moto Master 520 Fusion 51 teeth black KTM / Husqvarna
Article no.: MMAST-12112241

Rear Sprocket Moto Master 520 Fusion 51 teeth black KTM / Husqvarna

73,50 €
In stock
Moto Master
Rear Sprocket Moto Master 520 aluminium 46 teeth orange KTM / Husqvarna
Article no.: MMAST-12112229

Rear Sprocket Moto Master 520 aluminium 46 teeth orange KTM / Husqvarna

54,00 €
In stock
Moto Master
Rear Sprocket Moto Master 520 aluminium 44 teeth orange KTM / Husqvarna
Article no.: MMAST-12112227

Rear Sprocket Moto Master 520 aluminium 44 teeth orange KTM / Husqvarna

54,00 €
In stock
Moto Master
Rear Sprocket Moto Master 520 aluminium 44 teeth blue KTM / Husqvarna
Article no.: MMAST-12112212

Rear Sprocket Moto Master 520 aluminium 44 teeth blue KTM / Husqvarna

50,00 €
In stock
Moto Master
Rear Sprocket Moto Master 520 aluminium 45 teeth black KTM / Husqvarna
Article no.: MMAST-12112198

Rear Sprocket Moto Master 520 aluminium 45 teeth black KTM / Husqvarna

48,00 €
In stock
Sale
Moto Master
Rear Sprocket Moto Master 520 aluminium 44 teeth black KTM / Husqvarna
Article no.: MMAST-12112197

Rear Sprocket Moto Master 520 aluminium 44 teeth black KTM / Husqvarna

45,00 €
In stock
Sale
Moto Master
Rear Sprocket Moto Master 520 aluminium 43 teeth black KTM / Husqvarna
Article no.: MMAST-12112196

Rear Sprocket Moto Master 520 aluminium 43 teeth black KTM / Husqvarna

45,00 €
In stock
Sale
Moto Master
Rear Sprocket Moto Master 420 aluminium 51 teeth black KX 85
Article no.: MMAST-12112188

Rear Sprocket Moto Master 420 aluminium 51 teeth black KX 85

54,00 €
In stock
Moto Master
Rear Sprocket Moto Master 428 aluminium 54 teeth blue RM 85 / YZ 85
Article no.: MMAST-12112155

Rear Sprocket Moto Master 428 aluminium 54 teeth blue RM 85 / YZ 85

51,00 €
In stock
Moto Master
Rear Sprocket Moto Master 520 Fusion 50 teeth black CR / CRF
Article no.: MMAST-12112105

Rear Sprocket Moto Master 520 Fusion 50 teeth black CR / CRF

73,50 €
In stock
Moto Master
Rear Sprocket Moto Master 520 aluminium 47 teeth black CR / CRF
Article no.: MMAST-12112090

Rear Sprocket Moto Master 520 aluminium 47 teeth black CR / CRF

54,00 €
In stock
Moto Master
Rear Sprocket Moto Master 520 aluminium 46 teeth black CR / CRF
Article no.: MMAST-12112089

Rear Sprocket Moto Master 520 aluminium 46 teeth black CR / CRF

45,00 €
In stock
Sale
Moto Master
Rear Sprocket Moto Master Fusion 520 49 teeth red RM 125 / 250
Article no.: MMAST-12112085

Rear Sprocket Moto Master Fusion 520 49 teeth red RM 125 / 250

73,50 €
In stock
Moto Master
Rear Sprocket Moto Master 520 aluminium 45 teeth black RM 125 / 250
Article no.: MMAST-12112063

Rear Sprocket Moto Master 520 aluminium 45 teeth black RM 125 / 250

27,00 €
In stock
RRP
54,00 €
-50% Discount
Moto Master
Rear Sprocket Moto Master 520 steel 53 teeth Husqvarna CR / WR & Sherco
Article no.: MMAST-12102317

Rear Sprocket Moto Master 520 steel 53 teeth Husqvarna CR / WR & Sherco

47,50 €
In stock
Moto Master
Rear Sprocket Moto Master 520 steel 50 teeth CR / CRF
Article no.: MMAST-12102310

Rear Sprocket Moto Master 520 steel 50 teeth CR / CRF

40,50 €
In stock
Moto Master
Rear Sprocket Moto Master 520 steel 49 teeth Husqvarna / KTM
Article no.: MMAST-12102308

Rear Sprocket Moto Master 520 steel 49 teeth Husqvarna / KTM

40,50 €
In stock
Moto Master
Rear Sprocket Moto Master 520 steel 47 teeth KTM / Husqvarna
Article no.: MMAST-12102302

Rear Sprocket Moto Master 520 steel 47 teeth KTM / Husqvarna

41,50 €
In stock
Moto Master
Rear Sprocket Moto Master 520 steel 45 teeth KTM Freeride
Article no.: MMAST-12102293

Rear Sprocket Moto Master 520 steel 45 teeth KTM Freeride

42,00 €
In stock
Sale
Moto Master
Rear Sprocket Moto Master 420 steel 49 teeth TC / SX 65
Article no.: MMAST-12102284

Rear Sprocket Moto Master 420 steel 49 teeth TC / SX 65

45,00 €
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

42,00 €
In stock
Sale
Moto Master
Rear Sprocket Moto Master 520 steel 44 teeth YZ / YZF
Article no.: MMAST-12102263

Rear Sprocket Moto Master 520 steel 44 teeth YZ / YZF

45,00 €
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

42,00 €
In stock
Sale
Moto Master
Rear Sprocket Moto Master 428 steel 50 teeth TC /SX 85
Article no.: MMAST-12102258

Rear Sprocket Moto Master 428 steel 50 teeth TC /SX 85

45,00 €
In stock
Moto Master
Rear Sprocket Moto Master 428 steel 45 teeth TC /SX 85
Article no.: MMAST-12102253

Rear Sprocket Moto Master 428 steel 45 teeth TC /SX 85

45,00 €
In stock
Moto Master
Rear Sprocket Moto Master 520 steel 51 teeth KX /KXF
Article no.: MMAST-12102251

Rear Sprocket Moto Master 520 steel 51 teeth KX /KXF

42,00 €
In stock
Sale
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

45,00 €
In stock
Moto Master
Rear Sprocket Moto Master 520 steel 43 teeth KX /KXF
Article no.: MMAST-12102243

Rear Sprocket Moto Master 520 steel 43 teeth KX /KXF

45,00 €
In stock
Moto Master
Rear Sprocket Moto Master 520 steel 40 teeth KX /KXF
Article no.: MMAST-12102240

Rear Sprocket Moto Master 520 steel 40 teeth KX /KXF

45,00 €
In stock
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

24,00 €
In stock
24,50 €
-2% Discount
Sale
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

24,00 €
In stock
24,50 €
-2% Discount
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

24,00 €
In stock
24,50 €
-2% Discount
Sale
Doppler
Front Sprocket Doppler - 428 Neochrome Minarelli AM6
Article no.: CGN428NEOAM6

Front Sprocket Doppler - 428 Neochrome Minarelli AM6

11,00 €
In stock
11,50 €
-4% Discount
Doppler
Front Sprocket Doppler - 428 Black coating Minarelli AM6
Article no.: CGN428NOIRAM6

Front Sprocket Doppler - 428 Black coating Minarelli AM6

from 11,00 €
In stock
11,50 €
-4% 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
11,50 €
-4% Discount
Doppler
Front Sprocket Doppler - 420 Black coating Minarelli AM6
Article no.: CGN420NOIRAM6

Front Sprocket Doppler - 420 Black coating Minarelli AM6

from 11,00 €
In stock
11,50 €
-4% Discount
Doppler
Front Sprocket Doppler - 420 Black coating Derbi
Article no.: CGN420NOIRDERBI

Front Sprocket Doppler - 420 Black coating Derbi

from 11,00 €
In stock
11,50 €
-4% Discount
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

61,00 €
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

50,00 €
In stock
Sale
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
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

154,00 €
In stock
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

90,50 €
In stock
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

26,00 €
In stock
Sale
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
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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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