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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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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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Moose Racing
Rear Sprocket steel 520 Moose Racing Beta / Honda 47 teeth black
Article no.: MR12101754

Rear Sprocket steel 520 Moose Racing Beta / Honda 47 teeth black

10,50 €
In stock
RRP
27,50 €
-62% Discount
Moose Racing
Rear Sprocket steel 520 Moose Racing KTM / Husqvarna 52 teeth black
Article no.: MR12101752

Rear Sprocket steel 520 Moose Racing KTM / Husqvarna 52 teeth black

24,00 €
In stock
RRP
32,00 €
-25% Discount
Sale
Moose Racing
Rear Sprocket steel 520 Moose Racing KTM / Husqvarna 51 teeth black
Article no.: MR12101751

Rear Sprocket steel 520 Moose Racing KTM / Husqvarna 51 teeth black

24,00 €
In stock
RRP
32,00 €
-25% Discount
Sale
Moose Racing
Rear Sprocket steel 520 Moose Racing KTM / Husqvarna 50 teeth black
Article no.: MR12101750

Rear Sprocket steel 520 Moose Racing KTM / Husqvarna 50 teeth black

24,00 €
In stock
RRP
32,00 €
-25% Discount
Sale
Moose Racing
Rear Sprocket aluminium / steel 520 Moose Racing Beta RR 50 teeth red
Article no.: MR12101542

Rear Sprocket aluminium / steel 520 Moose Racing Beta RR 50 teeth red

59,00 €
In stock
Sale
Moose Racing
Rear Sprocket aluminium / steel 520 Moose Racing KTM / Husqvarna 48 teeth orange
Article no.: MR12101516

Rear Sprocket aluminium / steel 520 Moose Racing KTM / Husqvarna 48 teeth orange

23,00 €
In stock
RRP
61,00 €
-62% Discount
Moose Racing
Rear Sprocket aluminium / steel 520 Moose Racing Yamaha 50 teeth black
Article no.: MR12101481

Rear Sprocket aluminium / steel 520 Moose Racing Yamaha 50 teeth black

54,00 €
In stock
RRP
70,00 €
-23% Discount
Sale
Moose Racing
Rear Sprocket aluminium / steel 520 Moose Racing Yamaha 48 teeth blue
Article no.: MR12101477

Rear Sprocket aluminium / steel 520 Moose Racing Yamaha 48 teeth blue

54,00 €
In stock
RRP
70,00 €
-23% Discount
Sale
Moose Racing
Rear Sprocket aluminium / steel 520 Moose Racing Beta / Honda 51 teeth red
Article no.: MR12101471

Rear Sprocket aluminium / steel 520 Moose Racing Beta / Honda 51 teeth red

59,00 €
In stock
RRP
70,00 €
-16% Discount
Sale
Moose Racing
Rear Sprocket aluminium / steel 520 Moose Racing Beta / Honda 50 teeth black
Article no.: MR12101466

Rear Sprocket aluminium / steel 520 Moose Racing Beta / Honda 50 teeth black

59,00 €
In stock
Sale
Moose Racing
Rear Sprocket aluminium 520 Moose Racing Beta RR 50 teeth red
Article no.: MR12111867

Rear Sprocket aluminium 520 Moose Racing Beta RR 50 teeth red

28,00 €
In stock
RRP
46,00 €
-39% Discount
Sale
Moose Racing
Rear Sprocket aluminium 520 Moose Racing Yamaha 49 teeth after 1999
Article no.: MR12111587

Rear Sprocket aluminium 520 Moose Racing Yamaha 49 teeth after 1999

14,50 €
In stock
RRP
39,50 €
-63% Discount
Moose Racing
Rear Sprocket aluminium 520 Moose Racing KTM / Husqvarna 46 teeth
Article no.: MR12111550

Rear Sprocket aluminium 520 Moose Racing KTM / Husqvarna 46 teeth

14,50 €
In stock
RRP
39,50 €
-63% Discount
Moose Racing
Rear Sprocket aluminium 520 Moose Racing Beta / Honda 49 teeth
Article no.: MR12111514

Rear Sprocket aluminium 520 Moose Racing Beta / Honda 49 teeth

14,50 €
In stock
RRP
39,50 €
-63% Discount
Moose Racing
Rear Sprocket aluminium 520 Moose Racing KTM / Husqvarna 48 teeth black
Article no.: MR12111454

Rear Sprocket aluminium 520 Moose Racing KTM / Husqvarna 48 teeth black

35,00 €
In stock
RRP
46,00 €
-24% Discount
Sale
Moose Racing
Rear Sprocket aluminium 520 Moose Racing KTM / Husqvarna 45 teeth black
Article no.: MR12111451

Rear Sprocket aluminium 520 Moose Racing KTM / Husqvarna 45 teeth black

14,50 €
In stock
RRP
39,50 €
-63% Discount
Moose Racing
Rear Sprocket aluminium 520 Moose Racing Beta / Husqvarna 42 teeth black
Article no.: MR12111434

Rear Sprocket aluminium 520 Moose Racing Beta / Husqvarna 42 teeth black

14,50 €
In stock
RRP
39,50 €
-63% Discount
Moose Racing
Rear Sprocket aluminium 428 Moose Racing RM / YZ 85 50 teeth blue
Article no.: MR12111614

Rear Sprocket aluminium 428 Moose Racing RM / YZ 85 50 teeth blue

35,00 €
In stock
RRP
42,00 €
-17% Discount
Sale
Moose Racing
Rear Sprocket aluminium 520 Moose Racing KTM / Husqvarna 50 teeth orange
Article no.: MR12111662

Rear Sprocket aluminium 520 Moose Racing KTM / Husqvarna 50 teeth orange

35,00 €
In stock
RRP
46,00 €
-24% Discount
Sale
Moose Racing
Rear Sprocket aluminium 420 Moose Racing TC / SX 65 46 teeth orange
Article no.: MR12111655

Rear Sprocket aluminium 420 Moose Racing TC / SX 65 46 teeth orange

14,50 €
In stock
RRP
39,50 €
-63% Discount
Doppler
Chain Guide Doppler Derbi / Aprilia / Gilera gold
Article no.: CGN505687

Chain Guide Doppler Derbi / Aprilia / Gilera gold

31,00 €
In stock
Sale
Doppler
Chain Guide Doppler blue Derbi / Aprilia / Gilera
Article no.: CGN505688

Chain Guide Doppler blue Derbi / Aprilia / Gilera

31,00 €
In stock
Sale
Doppler
Chain reinforced 140 d.420 links Doppler gold
Article no.: CGN503602

Chain reinforced 140 d.420 links Doppler gold

25,00 €
In stock
Sale
Doppler
Chain Master Link reinforced 420 Doppler gold
Article no.: CGN504541

Chain Master Link reinforced 420 Doppler gold

3,60 €
In stock
Top Performances
Gearwheel 4th gear secondary shaft Top Performances T27 AM6 V1
Article no.: TAM00034

Gearwheel 4th gear secondary shaft Top Performances T27 AM6 V1

27,00 €
In stock
RRP
42,00 €
-36% Discount
Sale
Top Performances
Gearwheel 3rd gear secondary shaft Top Performances T29 AM6 V2
Article no.: TAM00012

Gearwheel 3rd gear secondary shaft Top Performances T29 AM6 V2

28,50 €
In stock
RRP
43,00 €
-34% Discount
Top Performances
Gearwheel 1st gear secondary shaft Top Performances T36 AM6 V2
Article no.: TAM00010

Gearwheel 1st gear secondary shaft Top Performances T36 AM6 V2

30,00 €
In stock
RRP
48,00 €
-38% Discount
Sale
Top Performances
Gearwheel 5th gear primary shaft Top Performances T24 AM6 V2
Article no.: TAM00008

Gearwheel 5th gear primary shaft Top Performances T24 AM6 V2

12,50 €
In stock
RRP
33,00 €
-62% Discount
Top Performances
Gearwheel 3rd-4th gear primary shaft Top Performances Minarelli T19-22 AM6 V2
Article no.: TAM00007

Gearwheel 3rd-4th gear primary shaft Top Performances Minarelli T19-22 AM6 V2

52,00 €
In stock
RRP
83,00 €
-37% Discount
Sale
Top Performances
Gearbox complete Top Performances Minarelli AM6
Article no.: T9935000

Gearbox complete Top Performances Minarelli AM6

584,00 €
In stock
RRP
858,00 €
-32% Discount
Standard Parts
Shift Drum Generic / Minarelli AM6
Article no.: EKP-32173

Shift Drum Generic / Minarelli AM6

67,50 €
In stock
69,00 €
-2% Discount
Jasil
Gearbox complete Top Racing Derbi Euro 3
Article no.: JA6250005
1

Gearbox complete Top Racing Derbi Euro 3

452,00 €
In stock
Derbi
Primary Gears Derbi Euro 3 GPR
Article no.: OE-DE8470395

Primary Gears Derbi Euro 3 GPR

319,00 €
In stock
Standard Parts
Spring f. gear shift lock lever Pit Bike engine Lifan 125cc / 140cc
Article no.: MB24323/152FMH

Spring f. gear shift lock lever Pit Bike engine Lifan 125cc / 140cc

0,60 €
In stock
RRP
1,20 €
-50% Discount
Standard Parts
Chain Tensioner round 15mm Pit Bike / Dirt Bike
Article no.: MB_TENSIOROUND15/COLOR

Chain Tensioner round 15mm Pit Bike / Dirt Bike

6,80 €
In stock
Standard Parts
Chain Tensioner round 12mm Pit Bike / Dirt Bike
Article no.: MB_TENSIOROUND12/COLOR

Chain Tensioner round 12mm Pit Bike / Dirt Bike

from 3,00 €
In stock
8,30 €
-64% Discount
Standard Parts
Chain Tensioner square 15mm Pit Bike / Dirt Bike
Article no.: MB_TENSIO15/COLOR

Chain Tensioner square 15mm Pit Bike / Dirt Bike

6,60 €
In stock
Standard Parts
Chain Tensioner square 12mm Pit Bike / Dirt Bike
Article no.: MB_TENSIO12/COLOR

Chain Tensioner square 12mm Pit Bike / Dirt Bike

7,30 €
In stock
Standard Parts
Slide Piece swingarm nylon Pit Bike / Dirt Bike
Article no.: MB2478

Slide Piece swingarm nylon Pit Bike / Dirt Bike

4,50 €
In stock
Standard Parts
Gear Selector Fork 150cc / 160cc YX (KLX)
Article no.: MB3023

Gear Selector Fork 150cc / 160cc YX (KLX)

19,50 €
In stock
RRP
51,00 €
-62% Discount
Standard Parts
Gear Selector Fork 125cc / 140cc / 149cc YX (CRF)
Article no.: MB3117

Gear Selector Fork 125cc / 140cc / 149cc YX (CRF)

54,00 €
In stock
Standard Parts
Gear Shift Lock Lever Pit Bike / Dirt Bike
Article no.: MB7632

Gear Shift Lock Lever Pit Bike / Dirt Bike

2,00 €
In stock
RRP
5,10 €
-61% Discount
Standard Parts
Rear Sprocket 420 Pit Bike / Dirt Bike
Article no.: MB_REARSPRO420_PIT/SIZE

Rear Sprocket 420 Pit Bike / Dirt Bike

from 11,00 €
In stock
Standard Parts
Secondary Gears start in neutral Pit Bike 125cc Lifan - d.20mm
Article no.: MB3432

Secondary Gears start in neutral Pit Bike 125cc Lifan - d.20mm

58,00 €
In stock
61,50 €
-6% Discount
Standard Parts
Secondary Transmission start in neutral Pit Bike 125cc YX - d.17mm
Article no.: MB3954

Secondary Transmission start in neutral Pit Bike 125cc YX - d.17mm

21,00 €
In stock
RRP
56,00 €
-63% Discount
Standard Parts
Primary Transmission Pit Bike 125cc 138cc 140cc 150cc Lifan
Article no.: MB3433

Primary Transmission Pit Bike 125cc 138cc 140cc 150cc Lifan

19,50 €
In stock
RRP
52,00 €
-63% Discount
Standard Parts
Rear Sprocket 51 teeth - 420 d. 100mm red Beta RR
Article no.: SP-37396/RE

Rear Sprocket 51 teeth - 420 d. 100mm red Beta RR

27,00 €
In stock
Standard Parts
Rear Sprocket 50 teeth - 420 d. 100mm red Beta RR
Article no.: SP-40580/RE

Rear Sprocket 50 teeth - 420 d. 100mm red Beta RR

23,50 €
In stock
Standard Parts
Front Sprocket 428 Derbi / Gilera / Aprilia
Article no.: MF89.0001_PIGNON_DERBI_428

Front Sprocket 428 Derbi / Gilera / Aprilia

from 5,00 €
In stock
8,30 €
-40% Discount
AFAM
Chain Master Link Afam 428 gold
Article no.: AFAM485376

Chain Master Link Afam 428 gold

2,40 €
In stock
AFAM
Chain Master Link Afam 420 gold
Article no.: AFAM483128

Chain Master Link Afam 420 gold

2,60 €
In stock
Standard Parts
Rear Sprocket steel 48 teeth - 420 CPI SX / SM
Article no.: MF89.00370

Rear Sprocket steel 48 teeth - 420 CPI SX / SM

14,00 €
In stock
16,00 €
-13% Discount
Sale
Polini
Gear Selector 4-speed Polini (H=51mm) Vespa Primavera 50 - 125cc ET3 before 1979
Article no.: P230.0405

Gear Selector 4-speed Polini (H=51mm) Vespa Primavera 50 - 125cc ET3 before 1979

96,00 €
In stock
RRP
111,00 €
-14% Discount
Sale
Doppler
Chain Master Link Doppler 428
Article no.: CGN5045_CHAINLINK428COLOR
2

Chain Master Link Doppler 428

from 3,20 €
In stock
Doppler
Chain Master Link Doppler 420
Article no.: CGN5045_CHAINLINK420COLOR

Chain Master Link Doppler 420

2,40 €
In stock
Doppler
Chain reinforced 138 links D.428 orange
Article no.: CGN503983

Chain reinforced 138 links D.428 orange

21,00 €
In stock
26,00 €
-19% Discount
Sale
Doppler
Chain reinforced 138 links D.428 blue
Article no.: CGN503982

Chain reinforced 138 links D.428 blue

31,50 €
In stock
Doppler
Chain reinforced 138 links D.428 gold
Article no.: CGN503614

Chain reinforced 138 links D.428 gold

28,00 €
In stock
Sale
Standard Parts
Chain reinforced 130 links D.420 black
Article no.: MF89.00140

Chain reinforced 130 links D.420 black

13,00 €
In stock
Standard Parts
Chain Guide Derbi / Aprilia / Gilera red
Article no.: MF89.00192
1

Chain Guide Derbi / Aprilia / Gilera red

26,00 €
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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