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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 428 aluminium 49 teeth black TC / SX 85
Article no.: MMAST-12112257

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

27,00 €
In stock
RRP
54,00 €
-50% Discount
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

77,50 €
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

27,00 €
In stock
RRP
54,00 €
-50% Discount
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

27,00 €
In stock
RRP
54,00 €
-50% Discount
Moto Master
Rear Sprocket Moto Master 520 aluminium 45 teeth blue KTM / Husqvarna
Article no.: MMAST-12112213

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

56,50 €
In stock
Moto Master
Rear Sprocket MotoMaster 520 aluminium 45 teeth black KTM / Husqvarna
Article no.: MMAST-12112198

Rear Sprocket MotoMaster 520 aluminium 45 teeth black KTM / Husqvarna

55,50 €
In stock
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

54,00 €
In stock
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

54,00 €
In stock
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

27,00 €
In stock
RRP
54,00 €
-50% Discount
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

26,00 €
In stock
RRP
51,00 €
-49% Discount
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

27,00 €
In stock
RRP
54,00 €
-50% Discount
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

54,00 €
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

24,00 €
In stock
RRP
47,50 €
-49% Discount
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

30,00 €
In stock
RRP
40,50 €
-26% Discount
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

32,00 €
In stock
RRP
40,50 €
-21% Discount
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

50,50 €
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

49,00 €
In stock
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 44 teeth YZ / YZF
Article no.: MMAST-12102263

Rear Sprocket Moto Master 520 steel 44 teeth YZ / YZF

48,50 €
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

23,00 €
In stock
RRP
45,00 €
-49% Discount
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

50,50 €
In stock
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

32,00 €
In stock
RRP
45,00 €
-29% 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

23,00 €
In stock
RRP
45,00 €
-49% Discount
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

26,50 €
In stock
Doppler
Chain Tensioner axle 15mm Doppler Alu CNC blue Derbi / Gilera / Aprilia
Article no.: CGN508647

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

26,50 €
In stock
Doppler
Chain Tensioner 12mm axle Doppler Alu CNC gold Derbi / Gilera / Aprilia
Article no.: CGN508642

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

25,50 €
In stock
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

25,50 €
In stock
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 - 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

12,50 €
In stock
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
Doppler
Front Sprocket Doppler - 420 Black coating Derbi
Article no.: CGN420NOIRDERBI

Front Sprocket Doppler - 420 Black coating Derbi

12,50 €
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

32,50 €
In stock
36,00 €
-10% 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

69,00 €
In stock
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

56,00 €
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
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 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

34,00 €
In stock
RRP
68,00 €
-50% Discount
Malossi
Primary Transmission Malossi 15/40 Suzuki
Article no.: M6711297

Primary Transmission Malossi 15/40 Suzuki

97,00 €
In stock
RRP
154,00 €
-37% 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

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

13,00 €
In stock
RRP
25,50 €
-49% Discount
AFAM
Rear Sprocket 52 teeth - 420 Afam Aprilia SX 50
Article no.: A264720

Rear Sprocket 52 teeth - 420 Afam Aprilia SX 50

31,00 €
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
Renthal
Chain 520 R1 Works 120 links
Article no.: REN-R1520120

Chain 520 R1 Works 120 links

108,00 €
In stock
Renthal
Chain Master Link R1 428
Article no.: REN-R1428ML

Chain Master Link R1 428

2,40 €
In stock
Renthal
Chain Master Link R1 415
Article no.: REN-12250550

Chain Master Link R1 415

1,00 €
In stock
RRP
2,10 €
-52% Discount
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

141,00 €
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

11,00 €
In stock
RRP
21,50 €
-49% Discount
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

26,50 €
In stock
Renthal
Front Sprocket Renthal 520 Z.15 self-cleaning Kawasaki YZ 250 / YZF 450
Article no.: REN-R28952015

Front Sprocket Renthal 520 Z.15 self-cleaning Kawasaki YZ 250 / YZF 450

21,50 €
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

26,50 €
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

30,50 €
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

28,00 €
In stock
RRP
54,50 €
-49% Discount
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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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