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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
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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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

27,00 €
In stock
35,00 €
-23% Discount
Sale
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
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

15,00 €
In stock
20,00 €
-25% Discount
Sale
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

14,00 €
In stock
19,00 €
-26% Discount
Sale
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

18,00 €
In stock
23,00 €
-22% Discount
Sale
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

18,00 €
In stock
23,00 €
-22% Discount
Sale
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

43,00 €
In stock
55,00 €
-22% Discount
Sale
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

40,00 €
In stock
51,00 €
-22% Discount
Sale
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

19,00 €
In stock
25,00 €
-24% Discount
Sale
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

21,00 €
In stock
27,00 €
-22% Discount
Sale
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

19,00 €
In stock
25,00 €
-24% Discount
Sale
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

46,00 €
In stock
57,00 €
-19% Discount
Sale
Renthal
Rear Sprocket Renthal 520 Z.45 Ultra Light self-cleaning orange KTM / Husqvarna / GasGas
Article no.: REN-12112471

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

55,50 €
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

44,00 €
In stock
Sale
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

40,00 €
In stock
52,00 €
-23% Discount
Sale
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

40,00 €
In stock
Sale
Renthal
Rear Sprocket Renthal 520 Z.50 Ultra Light self-cleaning green Kawasaki KX / KXF
Article no.: REN-12111347

Rear Sprocket Renthal 520 Z.50 Ultra Light self-cleaning green Kawasaki KX / KXF

43,00 €
In stock
53,00 €
-19% Discount
Sale
Renthal
Rear Sprocket Renthal 520 Z.52 Ultra Light self-cleaning CR / CRF
Article no.: REN-12111144

Rear Sprocket Renthal 520 Z.52 Ultra Light self-cleaning CR / CRF

43,00 €
In stock
Sale
Renthal
Rear Sprocket Renthal 520 Z.51 Ultra Light self-cleaning CR / CRF
Article no.: REN-12111143

Rear Sprocket Renthal 520 Z.51 Ultra Light self-cleaning CR / CRF

54,50 €
In stock
Renthal
Rear Sprocket Renthal 520 Z.50 Ultra Light self-cleaning blue YZ / YZF
Article no.: REN-12110166

Rear Sprocket Renthal 520 Z.50 Ultra Light self-cleaning blue YZ / YZF

43,00 €
In stock
55,00 €
-22% Discount
Sale
Renthal
Rear Sprocket Renthal 520 Z.48 Ultra Light self-cleaning blue YZ / YZF
Article no.: REN-12110164

Rear Sprocket Renthal 520 Z.48 Ultra Light self-cleaning blue YZ / YZF

29,50 €
In stock
RRP
58,50 €
-50% Discount
Renthal
Rear Sprocket Renthal 520 Z.51 Ultra Light self-cleaning red CR / CRF
Article no.: REN-12110162

Rear Sprocket Renthal 520 Z.51 Ultra Light self-cleaning red CR / CRF

43,00 €
In stock
55,00 €
-22% Discount
Sale
Renthal
Rear Sprocket Renthal 428 Z.50 Ultra Light self-cleaning TC / SX 85
Article no.: REN-12110092

Rear Sprocket Renthal 428 Z.50 Ultra Light self-cleaning TC / SX 85

50,50 €
In stock
Renthal
Rear Sprocket Renthal 428 Z.49 Ultra Light self-cleaning TC / SX 85
Article no.: REN-12110091

Rear Sprocket Renthal 428 Z.49 Ultra Light self-cleaning TC / SX 85

50,50 €
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

37,00 €
In stock
47,00 €
-21% Discount
Sale
Renthal
Rear Sprocket Renthal 520 Z.51 Ultra Light self-cleaning black KTM / Husqvarna / GasGas
Article no.: REN-12110048

Rear Sprocket Renthal 520 Z.51 Ultra Light self-cleaning black KTM / Husqvarna / GasGas

58,50 €
In stock
Renthal
Rear Sprocket Renthal 520 Z.50 Ultra Light self-cleaning black KTM / Husqvarna / GasGas
Article no.: REN-12110047

Rear Sprocket Renthal 520 Z.50 Ultra Light self-cleaning black KTM / Husqvarna / GasGas

43,00 €
In stock
55,00 €
-22% Discount
Sale
Renthal
Rear Sprocket Renthal 520 Z.51 Ultra Light self-cleaning black YZ / YZF
Article no.: REN-12110028

Rear Sprocket Renthal 520 Z.51 Ultra Light self-cleaning black YZ / YZF

43,00 €
In stock
55,00 €
-22% Discount
Sale
Renthal
Rear Sprocket Renthal 520 Z.52 Ultra Light self-cleaning black Kawasaki KX / KXF
Article no.: REN-12110019

Rear Sprocket Renthal 520 Z.52 Ultra Light self-cleaning black Kawasaki KX / KXF

63,00 €
In stock
Renthal
Rear Sprocket Renthal 520 Z.51 Ultra Light self-cleaning black Kawasaki KX / KXF
Article no.: REN-12110018

Rear Sprocket Renthal 520 Z.51 Ultra Light self-cleaning black Kawasaki KX / KXF

58,50 €
In stock
Renthal
Rear Sprocket Renthal 520 Z.50 Ultra Light self-cleaning black Kawasaki KX / KXF
Article no.: REN-12110017

Rear Sprocket Renthal 520 Z.50 Ultra Light self-cleaning black Kawasaki KX / KXF

43,00 €
In stock
55,00 €
-22% Discount
Sale
Scar
Chain Tensioners / Axle Blocks Scar aluminium SX /EXC orange
Article no.: SC-17310308

Chain Tensioners / Axle Blocks Scar aluminium SX /EXC orange

17,50 €
In stock
RRP
35,00 €
-50% Discount
Scar
Chain Tensioners / Axle Blocks Scar aluminium SX /EXC orange
Article no.: SC-17310307

Chain Tensioners / Axle Blocks Scar aluminium SX /EXC orange

35,00 €
In stock
Scar
Chain Tensioners / Axle Blocks Scar aluminium Sherco SE / SE-F blue
Article no.: SC-12310846

Chain Tensioners / Axle Blocks Scar aluminium Sherco SE / SE-F blue

35,00 €
In stock
Standard Parts
Woodruff Key clutch basket Buzzetti 9.5x3x3.7mm Simson
Article no.: MOF-BZA30426

Woodruff Key clutch basket Buzzetti 9.5x3x3.7mm Simson

1,90 €
In stock
Standard Parts
Lock Washer shift drum lever B4 Simson
Article no.: MOF-42438

Lock Washer shift drum lever B4 Simson

0,20 €
In stock
Standard Parts
Lock Plate front sprocket Simson
Article no.: MOF-42173

Lock Plate front sprocket Simson

1,50 €
In stock
Standard Parts
Rear Sprocket Carrier V2 reinforced Simson
Article no.: MOF-42125

Rear Sprocket Carrier V2 reinforced Simson

15,00 €
In stock
Standard Parts
Chain Tensioner chrome Simson
Article no.: MOF-41871

Chain Tensioner chrome Simson

3,60 €
In stock
Standard Parts
Front Sprocket 14 teeth old version Simson
Article no.: MOF-41741

Front Sprocket 14 teeth old version Simson

8,40 €
In stock
Standard Parts
Front Sprocket 12 teeth (old version) Simson
Article no.: MOF-41739

Front Sprocket 12 teeth (old version) Simson

7,20 €
In stock
Standard Parts
Speedometer Drive for 14 teeth front sprocket Simson
Article no.: MOF-41677

Speedometer Drive for 14 teeth front sprocket Simson

13,00 €
In stock
RRP
26,00 €
-50% Discount
Standard Parts
Gear 32 teeth 3rd gear Simson
Article no.: MOF-41574

Gear 32 teeth 3rd gear Simson

28,00 €
In stock
Standard Parts
Gear 18 teeth 2nd gear primary transmission Simson
Article no.: MOF-41552

Gear 18 teeth 2nd gear primary transmission Simson

28,50 €
In stock
Standard Parts
Clutch Control Lever Shaft Set Simson
Article no.: MOF-41483

Clutch Control Lever Shaft Set Simson

41,00 €
In stock
Standard Parts
Output Shaft 4-speed gearbox 12 holes Simson
Article no.: MOF-41432

Output Shaft 4-speed gearbox 12 holes Simson

37,50 €
In stock
Standard Parts
Lock Lever gearshift drum Simson
Article no.: MOF-41427

Lock Lever gearshift drum Simson

5,90 €
In stock
Standard Parts
Woodruff Key 3x3.7mm Simson
Article no.: MOF-41417

Woodruff Key 3x3.7mm Simson

0,70 €
In stock
Standard Parts
Bushing gearshift shaft lock lever 4-speed Simson
Article no.: MOF-41395

Bushing gearshift shaft lock lever 4-speed Simson

3,80 €
In stock
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51

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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