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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
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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Standard Parts
Chain Guide Derbi / Aprilia / Gilera blue
Article no.: MF89.00191

Chain Guide Derbi / Aprilia / Gilera blue

26,00 €
In stock
Standard Parts
Rear Sprocket 48 teeth - 420 Rieju MRT
Article no.: EKP-149076

Rear Sprocket 48 teeth - 420 Rieju MRT

27,50 €
In stock
Doppler
Rear Sprocket 53 teeth - 428 Doppler aluminium CNC black Beta RR
Article no.: CGN500931

Rear Sprocket 53 teeth - 428 Doppler aluminium CNC black Beta RR

54,50 €
In stock
Doppler
Rear Sprocket 53 teeth - 428 Doppler aluminium CNC black Sherco Enduro 50
Article no.: CGN500923

Rear Sprocket 53 teeth - 428 Doppler aluminium CNC black Sherco Enduro 50

55,00 €
In stock
Sale
Doppler
Rear Sprocket 53 teeth - 420 Doppler aluminium CNC black Aprilia SX 50
Article no.: CGN500922

Rear Sprocket 53 teeth - 420 Doppler aluminium CNC black Aprilia SX 50

45,00 €
In stock
Sale
Doppler
Rear Sprocket 53 teeth - 420 Doppler aluminium CNC black Rieju MRT
Article no.: CGN500921

Rear Sprocket 53 teeth - 420 Doppler aluminium CNC black Rieju MRT

46,00 €
In stock
Sale
Rieju
Swingarm Slider Rieju MRT / MRX
Article no.: OE-RIE3605001

Swingarm Slider Rieju MRT / MRX

15,00 €
In stock
Sale
Rieju
Swingarm Slider Rieju 50cc / 125cc
Article no.: OE-RIE7100302

Swingarm Slider Rieju 50cc / 125cc

6,00 €
In stock
11,00 €
-45% Discount
Sale
Standard Parts
Screw M8x1.00 - 40mm Rieju
Article no.: MF96.90050

Screw M8x1.00 - 40mm Rieju

1,60 €
In stock
Doppler
Chain Kit aluminium red 14x53 - 420 Doppler Derbi GPR / Aprilia RS4
Article no.: CGN492591

Chain Kit aluminium red 14x53 - 420 Doppler Derbi GPR / Aprilia RS4

81,00 €
In stock
Sale
AFAM
Chain reinforced 134 links 428 gold
Article no.: AFAM485375

Chain reinforced 134 links 428 gold

28,50 €
In stock
AFAM
Chain reinforced Racing 134 links 420 gold
Article no.: AFAM485374

Chain reinforced Racing 134 links 420 gold

46,00 €
In stock
Doppler
Chain reinforced 134 links D.420 Doppler gold
Article no.: CGN501122

Chain reinforced 134 links D.420 Doppler gold

22,00 €
In stock
Sale
Doppler
Chain reinforced 134 links D.420 Doppler red
Article no.: CGN501114

Chain reinforced 134 links D.420 Doppler red

26,00 €
In stock
Sale
Doppler
Chain reinforced 134 links D.420 Doppler black
Article no.: CGN501113

Chain reinforced 134 links D.420 Doppler black

27,00 €
In stock
Sale
Doppler
Chain reinforced 134 links D.420 Doppler yellow
Article no.: CGN501116

Chain reinforced 134 links D.420 Doppler yellow

27,00 €
In stock
Sale
Doppler
Chain reinforced 134 links D.420 Doppler blue
Article no.: CGN501115

Chain reinforced 134 links D.420 Doppler blue

31,00 €
In stock
Doppler
Chain Tensioner Doppler Alu red Rieju MRT
Article no.: CGN500944

Chain Tensioner Doppler Alu red Rieju MRT

23,00 €
In stock
Sale
Doppler
Chain Tensioner Doppler Alu black Rieju MRT
Article no.: CGN500945

Chain Tensioner Doppler Alu black Rieju MRT

23,00 €
In stock
Sale
Standard Parts
Rear Sprocket steel 53 teeth - 420 CPI SX / SM
Article no.: MF89.00372

Rear Sprocket steel 53 teeth - 420 CPI SX / SM

14,00 €
In stock
Sale
AFAM
Chain Kit Afam 14x48 - 428 Rieju MRT / Yamaha DT
Article no.: AFAM22

Chain Kit Afam 14x48 - 428 Rieju MRT / Yamaha DT

52,00 €
In stock
57,00 €
-9% Discount
Sale
AFAM
Chain Kit Afam 13x48 Derbi Fenix
Article no.: AFAM70

Chain Kit Afam 13x48 Derbi Fenix

41,50 €
In stock
RRP
111,00 €
-63% Discount
Standard Parts
Chain Kit 13x53 - 420 Derbi DRD Pro / Racing
Article no.: MF89.00222

Chain Kit 13x53 - 420 Derbi DRD Pro / Racing

40,50 €
In stock
Standard Parts
Chain Kit 11x53 - 420 D.108mm 6 holes Derbi GPR / Senda X-Treme
Article no.: MF89.00211

Chain Kit 11x53 - 420 D.108mm 6 holes Derbi GPR / Senda X-Treme

40,50 €
In stock
Standard Parts
Rear Sprocket reinforced 53 teeth - 420 Derbi Aprilia SX 50
Article no.: MF89.00444

Rear Sprocket reinforced 53 teeth - 420 Derbi Aprilia SX 50

44,00 €
In stock
Standard Parts
Front Sprocket 420 red Minarelli AM6
Article no.: STR-71REDAM6

Front Sprocket 420 red Minarelli AM6

from 9,80 €
In stock
Standard Parts
Front Sprocket 420 blue Derbi
Article no.: STR-71BLUEDERBI

Front Sprocket 420 blue Derbi

10,50 €
In stock
Str8
Front Sprocket 420 blue Minarelli AM6
Article no.: STR-71BLUEAM6

Front Sprocket 420 blue Minarelli AM6

from 8,80 €
In stock
Standard Parts
Rear Sprocket 53 teeth - 420 blue Rieju MRT
Article no.: STR-701.53/BL

Rear Sprocket 53 teeth - 420 blue Rieju MRT

29,00 €
In stock
Standard Parts
Rear Sprocket steel 53 teeth - 420 Aprilia SX 50
Article no.: MF89.00344
1

Rear Sprocket steel 53 teeth - 420 Aprilia SX 50

21,50 €
In stock
25,00 €
-14% Discount
Standard Parts
Rear Sprocket steel 50 teeth - 420 Aprilia SX 50
Article no.: MF89.00342

Rear Sprocket steel 50 teeth - 420 Aprilia SX 50

32,50 €
In stock
35,50 €
-8% Discount
Standard Parts
Rear Sprocket steel 48 teeth - 420 Aprilia SX 50
Article no.: MF89.00341

Rear Sprocket steel 48 teeth - 420 Aprilia SX 50

29,00 €
In stock
Sale
IGM
Rear Sprocket steel 44 teeth - 420 IGM Rieju MRT
Article no.: IGM85140

Rear Sprocket steel 44 teeth - 420 IGM Rieju MRT

15,00 €
In stock
19,50 €
-23% Discount
Sale
IGM
Rear Sprocket steel 65 teeth - 420 IGM Rieju MRT
Article no.: IGM13101205

Rear Sprocket steel 65 teeth - 420 IGM Rieju MRT

18,00 €
In stock
AFAM
Chain Kit AFAM 12x51 - 420 Beta RR after 2005
Article no.: AFAM500353

Chain Kit AFAM 12x51 - 420 Beta RR after 2005

57,50 €
In stock
AFAM
Chain Kit AFAM 12x52 - 420 Rieju MRT / Yamaha DT
Article no.: AFAM467442

Chain Kit AFAM 12x52 - 420 Rieju MRT / Yamaha DT

63,00 €
In stock
70,00 €
-10% Discount
Standard Parts
Chain Tensioner complete Motor Hispania Furia Cross
Article no.: SP-0016057

Chain Tensioner complete Motor Hispania Furia Cross

15,00 €
In stock
Standard Parts
Front Sprocket 13 teeth 420 Derbi Euro2 before 1999
Article no.: L-SA3692

Front Sprocket 13 teeth 420 Derbi Euro2 before 1999

7,00 €
In stock
8,40 €
-17% Discount
Sale
Derbi
Chain Guard Derbi Senda DRD Pro / X-Treme
Article no.: OE-DE00H01508181

Chain Guard Derbi Senda DRD Pro / X-Treme

32,00 €
In stock
Sale
Piaggio
Bleeder Tube gear box Piaggio / Vespa
Article no.: OE-PIACM162202

Bleeder Tube gear box Piaggio / Vespa

20,00 €
In stock
Doppler
Rear Sprocket 53 teeth / 428 chain Doppler CNC aluminium red Beta RR
Article no.: CGN496464
1

Rear Sprocket 53 teeth / 428 chain Doppler CNC aluminium red Beta RR

54,00 €
In stock
Sale
Doppler
Rear Sprocket 53 teeth - 420 Doppler aluminium CNC red Aprilia SX 50
Article no.: CGN492590

Rear Sprocket 53 teeth - 420 Doppler aluminium CNC red Aprilia SX 50

45,00 €
In stock
Sale
Doppler
Rear Sprocket 53 teeth - 420 Doppler aluminium CNC red Rieju MRT
Article no.: CGN491212

Rear Sprocket 53 teeth - 420 Doppler aluminium CNC red Rieju MRT

49,00 €
In stock
Sale
Standard Parts
Sprocket Retainer Plate Derbi D50B0 after 2006 (24mm hole spacing)
Article no.: 34426
1

Sprocket Retainer Plate Derbi D50B0 after 2006 (24mm hole spacing)

2,10 €
In stock
Standard Parts
Sprocket Washer Zündapp 4-speed
Article no.: 31525

Sprocket Washer Zündapp 4-speed

0,40 €
In stock
RRP
0,80 €
-50% Discount
Standard Parts
Chain Pulley Set Aprilia / CPI / Derbi / Gilera
Article no.: 34935

Chain Pulley Set Aprilia / CPI / Derbi / Gilera

9,40 €
In stock
Standard Parts
Chain Tensioners (x2) Tomos A3 / A35
Article no.: 28790

Chain Tensioners (x2) Tomos A3 / A35

2,10 €
In stock
RRP
5,50 €
-62% Discount
Rieju
Gear Shift Shaft original spare part Rieju RS2
Article no.: OE-RIE2407000

Gear Shift Shaft original spare part Rieju RS2

6,50 €
In stock
AFAM
Rear Sprocket AFAM 51 teeth - 420 Beta RR / Caballero
Article no.: CGN495148
1

Rear Sprocket AFAM 51 teeth - 420 Beta RR / Caballero

25,00 €
In stock
Sale
AFAM
Rear Sprocket 56 teeth - 428 Afam 6 holes d.110mm Sherco Enduro 50
Article no.: CGN495147

Rear Sprocket 56 teeth - 428 Afam 6 holes d.110mm Sherco Enduro 50

30,50 €
In stock
35,00 €
-13% Discount
Doppler
Primary Gears Doppler 15/50-13 (+20%) CPI / Keeway
Article no.: CGN493975

Primary Gears Doppler 15/50-13 (+20%) CPI / Keeway

81,00 €
In stock
Sale
Rieju
Chain Tensioner OEM quality Rieju 50
Article no.: EKP-126742

Chain Tensioner OEM quality Rieju 50

8,00 €
In stock
Sale
Piaggio
Roller bearing / needle bearing (HK1516) Piaggio 125/150/180
Article no.: OE-PIA430228

Roller bearing / needle bearing (HK1516) Piaggio 125/150/180

5,80 €
In stock
RMS
Output Shaft type A, B, Piaggio old with nut, cap, split-pin
Article no.: R100240090

Output Shaft type A, B, Piaggio old with nut, cap, split-pin

38,50 €
In stock
Italjet
Intermediate shaft Italjet Formula 38/11
Article no.: OE-ITJ337100101

Intermediate shaft Italjet Formula 38/11

29,50 €
In stock
RRP
81,00 €
-64% Discount
Aprilia
Washer intermediate shaft Minarelli 14x29x1mm
Article no.: OE-AP8206195

Washer intermediate shaft Minarelli 14x29x1mm

4,00 €
In stock
CPI
Primary gear shaft (clutch) CPI 13 teeth version 1
Article no.: OE-CPI20913

Primary gear shaft (clutch) CPI 13 teeth version 1

20,00 €
In stock
23,50 €
-15% Discount
CPI
Intermediate gear shaft 13/52 China 2-stroke CPI Keeway
Article no.: OE-CPI20912

Intermediate gear shaft 13/52 China 2-stroke CPI Keeway

20,00 €
In stock
Standard Parts
Chain Master Link chain 428, reinforced, gold
Article no.: L-SA485376

Chain Master Link chain 428, reinforced, gold

2,90 €
In stock
AFAM
Chain Master Link reinforced Afam for chain 415
Article no.: L-SA485371

Chain Master Link reinforced Afam for chain 415

2,00 €
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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