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Bracket Bushings & Spacers Chain Chain accessories Chain guard Chain guide Chain kit Chain master link Chain roller Chain slider Chain tensioner Circlip Clutch accessories Clutch gear Clutch kit Clutch release lever Clutch springs CVT sliders 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 Spring Transmission Transmission accessories Transmission gear Washer Wheel axle Woodruff key Bearing ball Cable guide Fuel cap Gear selector shaft Overflow hose Pedal shaft Sprocket screws
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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

22,00 €
In stock
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

21,00 €
In stock
RRP
54,50 €
-61% Discount
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

52,00 €
In stock
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

48,00 €
In stock
Sale
Renthal
Front Sprocket Renthal 520 Z.12 CR / WR 250
Article no.: REN-12121674

Front Sprocket Renthal 520 Z.12 CR / WR 250

6,70 €
In stock
RRP
18,00 €
-63% Discount
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

14,50 €
In stock
RRP
25,00 €
-42% Discount
Renthal
Front Sprocket Renthal 520 Z.13 Ultra Light YZ / YZF
Article no.: REN-12121638

Front Sprocket Renthal 520 Z.13 Ultra Light YZ / YZF

23,00 €
In stock
RRP
33,00 €
-30% 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

25,00 €
In stock
RRP
33,00 €
-24% Discount
Sale
Renthal
Front Sprocket Renthal 415 Z.11 TC / SX 50
Article no.: REN-12120826

Front Sprocket Renthal 415 Z.11 TC / SX 50

24,00 €
In stock
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

70,00 €
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

52,00 €
In stock
RRP
68,00 €
-24% 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

30,00 €
In stock
RRP
55,50 €
-46% 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

48,00 €
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

51,00 €
In stock
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

52,00 €
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

21,00 €
In stock
RRP
54,50 €
-61% Discount
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

51,00 €
In stock
Sale
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

51,00 €
In stock
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

51,00 €
In stock
Sale
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

23,00 €
In stock
RRP
58,50 €
-61% Discount
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

51,00 €
In stock
Sale
Scar
Chain Tensioners / Axle Blocks Scar aluminium SX /EXC orange
Article no.: SC-17310308

Chain Tensioners / Axle Blocks Scar aluminium SX /EXC orange

13,00 €
In stock
RRP
35,00 €
-63% 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

13,50 €
In stock
RRP
35,00 €
-61% Discount
Standard Parts
Woodruff Key clutch basket Buzzetti 9.5x3x3.7mm Simson
Article no.: MOF-BZA30426

Woodruff Key clutch basket Buzzetti 9.5x3x3.7mm Simson

2,00 €
In stock
Standard Parts
Lock Washer shift drum lever B4 Simson
Article no.: MOF-42438

Lock Washer shift drum lever B4 Simson

0,10 €
In stock
RRP
0,20 €
-50% Discount
Standard Parts
Rear Sprocket Carrier V2 reinforced Simson
Article no.: MOF-42125

Rear Sprocket Carrier V2 reinforced Simson

17,00 €
In stock
Standard Parts
Chain Tensioner Set galvanized Simson
Article no.: MOF-41891

Chain Tensioner Set galvanized Simson

3,90 €
In stock
Standard Parts
Chain Tensioner chrome Simson
Article no.: MOF-41871

Chain Tensioner chrome Simson

4,00 €
In stock
4,50 €
-11% Discount
Standard Parts
Front Sprocket 14 teeth old version Simson
Article no.: MOF-41741

Front Sprocket 14 teeth old version Simson

9,90 €
In stock
Standard Parts
Front Sprocket 12 teeth (old version) Simson
Article no.: MOF-41739

Front Sprocket 12 teeth (old version) Simson

2,70 €
In stock
RRP
7,20 €
-63% Discount
Standard Parts
Speedometer Drive for 14 teeth front sprocket Simson
Article no.: MOF-41677

Speedometer Drive for 14 teeth front sprocket Simson

10,00 €
In stock
RRP
26,00 €
-62% Discount
Standard Parts
Gear 32 teeth 3rd gear Simson
Article no.: MOF-41574

Gear 32 teeth 3rd gear Simson

10,50 €
In stock
RRP
28,00 €
-63% Discount
Standard Parts
Gear 18 teeth 2nd gear primary transmission Simson
Article no.: MOF-41552

Gear 18 teeth 2nd gear primary transmission Simson

21,00 €
In stock
Sale
Standard Parts
Clutch Control Lever Shaft Set Simson
Article no.: MOF-41483

Clutch Control Lever Shaft Set Simson

15,50 €
In stock
RRP
41,00 €
-62% Discount
Standard Parts
Output Shaft 4-speed gearbox 12 holes Simson
Article no.: MOF-41432

Output Shaft 4-speed gearbox 12 holes Simson

14,50 €
In stock
RRP
37,50 €
-61% Discount
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
Washer / Shim gearbox 24x35x1.2mm Simson
Article no.: MOF-41410

Washer / Shim gearbox 24x35x1.2mm Simson

2,20 €
In stock
Standard Parts
Bushing gearshift shaft lock lever 4-speed Simson
Article no.: MOF-41395

Bushing gearshift shaft lock lever 4-speed Simson

1,50 €
In stock
RRP
3,80 €
-61% Discount
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

7,00 €
In stock
RRP
19,00 €
-63% Discount
Standard Parts
Fixed Gear 25 teeth 4th gear Simson
Article no.: MOF-41291

Fixed Gear 25 teeth 4th gear Simson

6,40 €
In stock
RRP
17,00 €
-62% Discount
Standard Parts
Spring inner gear shift lever Simson
Article no.: MOF-41290

Spring inner gear shift lever Simson

0,50 €
In stock
RRP
1,00 €
-50% Discount
Standard Parts
Washer / Shim gearbox 24x35x1.4mm Simson
Article no.: MOF-41289

Washer / Shim gearbox 24x35x1.4mm Simson

4,00 €
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

2,50 €
In stock
Standard Parts
Front Sprocket 15 teeth 1/2x5.4 Simson
Article no.: MOF-40810

Front Sprocket 15 teeth 1/2x5.4 Simson

5,40 €
In stock
Standard Parts
Front Sprocket 13 teeth 1/2x5.4 Simson
Article no.: MOF-40808

Front Sprocket 13 teeth 1/2x5.4 Simson

5,40 €
In stock
Standard Parts
Chain 110 links 1/2x5,4 black Simson
Article no.: MOF-40804

Chain 110 links 1/2x5,4 black Simson

27,00 €
In stock
Standard Parts
Sealing Cap Gasket drive shaft Simson
Article no.: MOF-40751

Sealing Cap Gasket drive shaft Simson

1,30 €
In stock
Standard Parts
Screw Set rear sprocket M7x25mm Tomos A35
Article no.: MOF-39730

Screw Set rear sprocket M7x25mm Tomos A35

3,20 €
In stock
AFAM
Chain Kit Afam 520 MR2 KTM 14/48
Article no.: 48011974

Chain Kit Afam 520 MR2 KTM 14/48

104,00 €
In stock
124,00 €
-16% Discount
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

45,50 €
In stock
RRP
106,00 €
-57% 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

38,50 €
In stock
RRP
104,00 €
-63% Discount
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

101,00 €
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

39,50 €
In stock
RRP
105,00 €
-62% Discount
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

42,00 €
In stock
RRP
99,00 €
-58% Discount
AFAM
Rear Sprocket Afam steel self-cleaning 50 teeth KTM / Husqvarna
Article no.: 1074718003

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

21,50 €
In stock
RRP
48,50 €
-56% 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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