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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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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

58,50 €
In stock
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

59,00 €
In stock
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

58,50 €
In stock
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

58,50 €
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

50,50 €
In stock
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

58,50 €
In stock
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

58,50 €
In stock
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

58,50 €
In stock
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 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
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

23,00 €
In stock
Sale
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

5,00 €
In stock
5,90 €
-15% Discount
Sale
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
Standard Parts
Draw Key output shaft 3- / 4-speed Simson
Article no.: MOF-41386

Draw Key output shaft 3- / 4-speed Simson

7,10 €
In stock
Standard Parts
Lock Lever gearshift drum 4-speed Simson
Article no.: MOF-41364

Lock Lever gearshift drum 4-speed Simson

12,00 €
In stock
Standard Parts
Locking Washer clutch basket small Simson
Article no.: MOF-41339

Locking Washer clutch basket small Simson

1,80 €
In stock
Standard Parts
Idler Gear 31 teeth 4th gear Simson
Article no.: MOF-41292

Idler Gear 31 teeth 4th gear Simson

9,50 €
In stock
RRP
19,00 €
-50% Discount
Standard Parts
Fixed Gear 25 teeth 4th gear Simson
Article no.: MOF-41291

Fixed Gear 25 teeth 4th gear Simson

8,50 €
In stock
RRP
17,00 €
-50% Discount
Standard Parts
Spring inner gear shift lever Simson
Article no.: MOF-41290

Spring inner gear shift lever Simson

1,00 €
In stock
Standard Parts
Washer / Shim gearbox 24x35x1.4mm Simson
Article no.: MOF-41289

Washer / Shim gearbox 24x35x1.4mm Simson

4,00 €
In stock
Standard Parts
Gear Shift Spring Simson
Article no.: MOF-41286

Gear Shift Spring Simson

2,00 €
In stock
Standard Parts
Rear Sprocket Carrier Simson
Article no.: MOF-40834

Rear Sprocket Carrier Simson

3,70 €
In stock
Standard Parts
Chain Tensioner galvanized Simson
Article no.: MOF-40816

Chain Tensioner galvanized Simson

1,50 €
In stock
Standard Parts
Chain Master Link 1/2x5.4 Simson
Article no.: MOF-40815

Chain Master Link 1/2x5.4 Simson

1,20 €
In stock
Standard Parts
Front Sprocket 15 teeth 1/2x5.4 Simson
Article no.: MOF-40810

Front Sprocket 15 teeth 1/2x5.4 Simson

5,00 €
In stock
5,30 €
-6% Discount
Sale
Standard Parts
Front Sprocket 13 teeth 1/2x5.4 Simson
Article no.: MOF-40808

Front Sprocket 13 teeth 1/2x5.4 Simson

5,00 €
In stock
5,30 €
-6% Discount
Sale
Standard Parts
Chain 110 links 1/2x5,4 black Simson
Article no.: MOF-40804

Chain 110 links 1/2x5,4 black Simson

21,50 €
In stock
Standard Parts
Sealing Cap Gasket drive shaft Simson
Article no.: MOF-40751

Sealing Cap Gasket drive shaft Simson

1,20 €
In stock
Standard Parts
Rear Sprocket 22 teeth 415 Tomos A35
Article no.: MOF-40304

Rear Sprocket 22 teeth 415 Tomos A35

7,00 €
In stock
Sale
Standard Parts
Screw Set rear sprocket M7x25mm Tomos A35
Article no.: MOF-39730

Screw Set rear sprocket M7x25mm Tomos A35

2,90 €
In stock
D.I.D
Chain Kit D.I.D / PBR 520 ERT3 YZ 250 14/49 ultra-light rear sprocket
Article no.: 48012040

Chain Kit D.I.D / PBR 520 ERT3 YZ 250 14/49 ultra-light rear sprocket

142,00 €
In stock
AFAM
Chain Kit Afam 520 MR2 KTM 14/48
Article no.: 48011974

Chain Kit Afam 520 MR2 KTM 14/48

108,00 €
In stock
Sale
AFAM
Chain Kit Afam 520 MR2 YZ 125 13/51 ultra-light rear sprocket
Article no.: 48011608

Chain Kit Afam 520 MR2 YZ 125 13/51 ultra-light rear sprocket

69,00 €
In stock
RRP
106,00 €
-35% Discount
D.I.D
Chain Kit D.I.D / PBR 520 DZ2 YZ 250 14/50
Article no.: 48011592

Chain Kit D.I.D / PBR 520 DZ2 YZ 250 14/50

104,00 €
In stock
AFAM
Chain Kit Afam 428 MX 85 KX 13/51 ultra-light rear sprocket
Article no.: 48011186

Chain Kit Afam 428 MX 85 KX 13/51 ultra-light rear sprocket

95,00 €
In stock
AFAM
Chain Kit Afam 520 MR2 CR 125 13/51 1990-1997
Article no.: 48010865

Chain Kit Afam 520 MR2 CR 125 13/51 1990-1997

109,00 €
In stock
AFAM
Chain Kit Afam 420 MX CR 85 15/55
Article no.: 48010416

Chain Kit Afam 420 MX CR 85 15/55

105,00 €
In stock
AFAM
Chain Kit Afam 420 MX KX 80 / 85 13/49 self-cleaning rear sprocket
Article no.: 48010263

Chain Kit Afam 420 MX KX 80 / 85 13/49 self-cleaning rear sprocket

62,00 €
In stock
RRP
99,00 €
-37% Discount
AFAM
Chain Kit Afam 428 MX KTM 85 14 / 46
Article no.: 48010247

Chain Kit Afam 428 MX KTM 85 14 / 46

119,00 €
In stock
AFAM
Rear Sprocket Afam steel self-cleaning 50 teeth KTM / Husqvarna
Article no.: 1074718003

Rear Sprocket Afam steel self-cleaning 50 teeth KTM / Husqvarna

48,50 €
In stock
AFAM
Rear Sprocket Afam steel self-cleaning 51 teeth Yamaha YZ / YZF
Article no.: 1074433005

Rear Sprocket Afam steel self-cleaning 51 teeth Yamaha YZ / YZF

51,00 €
In stock
AFAM
Rear Sprocket Afam steel self-cleaning 48 teeth Kawasaki KX / KXF
Article no.: 1074558001

Rear Sprocket Afam steel self-cleaning 48 teeth Kawasaki KX / KXF

48,00 €
In stock
AFAM
Rear Sprocket Afam aluminium 41 teeth KTM / Husqvarna
Article no.: 1074736008

Rear Sprocket Afam aluminium 41 teeth KTM / Husqvarna

41,00 €
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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