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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 Needle bearing Oil seal kit 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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Doppler
Front Sprocket Doppler - 420 Neochrome Minarelli AM6
Article no.: CGN420NEOAM6

Front Sprocket Doppler - 420 Neochrome Minarelli AM6

from 10,00 €
In stock
Doppler
Front Sprocket Doppler - 420 Neochrome Derbi
Article no.: CGN420NEODERBI

Front Sprocket Doppler - 420 Neochrome Derbi

from 10,00 €
In stock
Doppler
Front Sprocket Doppler - 420 Black coating Minarelli AM6
Article no.: CGN420NOIRAM6

Front Sprocket Doppler - 420 Black coating Minarelli AM6

from 10,00 €
In stock
11,00 €
-9% Discount
Doppler
Front Sprocket Doppler - 420 Black coating Derbi
Article no.: CGN420NOIRDERBI

Front Sprocket Doppler - 420 Black coating Derbi

from 10,00 €
In stock
11,00 €
-9% Discount
Doppler
Rear Sprocket 53 teeth - 428 Doppler black steel Sherco Enduro 50
Article no.: CGN509881

Rear Sprocket 53 teeth - 428 Doppler black steel Sherco Enduro 50

30,00 €
In stock
Doppler
Rear Sprocket 53 teeth - 428 Doppler aluminium CNC blue Sherco Enduro 50
Article no.: CGN508243

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

55,00 €
In stock
65,00 €
-15% Discount
Polini
Primary Gears Polini 13/40 Piaggio NRG after 1998
Article no.: P202.1378
3

Primary Gears Polini 13/40 Piaggio NRG after 1998

88,00 €
In stock
RRP
96,00 €
-8% Discount
Polini
Primary Gears Polini 13/44 Yamaha Aerox / BW's
Article no.: P202.1370
1

Primary Gears Polini 13/44 Yamaha Aerox / BW's

79,50 €
In stock
RRP
93,00 €
-15% Discount
Polini
Secondary Gears Polini 16/44 Peugeot Speedfight / Ludix
Article no.: P202.1352
2

Secondary Gears Polini 16/44 Peugeot Speedfight / Ludix

85,00 €
In stock
RRP
98,00 €
-13% Discount
Polini
Secondary Gears Polini 15/42 Minarelli 15/42 1:280
Article no.: P202.1346
3

Secondary Gears Polini 15/42 Minarelli 15/42 1:280

79,50 €
In stock
RRP
93,00 €
-15% Discount
Polini
Secondary Gears Polini 14/41 Yamaha Aerox / BW's
Article no.: P202.1321
6

Secondary Gears Polini 14/41 Yamaha Aerox / BW's

86,50 €
In stock
RRP
93,00 €
-7% Discount
Malossi
Secondary Transmission Malossi 17/37 Piaggio X9 250cc
Article no.: M679983

Secondary Transmission Malossi 17/37 Piaggio X9 250cc

37,50 €
In stock
RRP
101,00 €
-63% Discount
Polini
Secondary Gears Polini 14/48 Piaggio NRG after 1998
Article no.: P202.1404

Secondary Gears Polini 14/48 Piaggio NRG after 1998

98,00 €
In stock
RRP
101,00 €
-3% Discount
Hot Rods
Repair Kit gearbox output shaft Hot Rods Yamaha WRF 450 / YZF 450
Article no.: HR-OSK0040

Repair Kit gearbox output shaft Hot Rods Yamaha WRF 450 / YZF 450

9,80 €
In stock
RRP
25,50 €
-62% Discount
AFAM
Rear Sprocket 52 teeth - 420 Afam Aprilia SX 50
Article no.: A264720

Rear Sprocket 52 teeth - 420 Afam Aprilia SX 50

22,00 €
In stock
Sale
Buzzetti
Chain Tensioner Buzzetti Gilera EC1 / Piaggio / Vespa Ciao
Article no.: WB-30429

Chain Tensioner Buzzetti Gilera EC1 / Piaggio / Vespa Ciao

9,00 €
In stock
Sale
Buzzetti
Woodruff Key clutch basket Buzzetti 10x3x3mm APE / Vespa
Article no.: WB-30423

Woodruff Key clutch basket Buzzetti 10x3x3mm APE / Vespa

1,80 €
In stock
Doppler
Primary Gears Doppler 13/43 Yamaha Aerox / BW's
Article no.: CGN283937
4

Primary Gears Doppler 13/43 Yamaha Aerox / BW's

80,00 €
In stock
RRP
89,00 €
-10% Discount
Renthal
Chain 520 R1 Works 120 links
Article no.: REN-R1520120

Chain 520 R1 Works 120 links

104,00 €
In stock
Renthal
Chain Master Link R3-3 520
Article no.: REN-12250467

Chain Master Link R3-3 520

5,00 €
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

8,00 €
In stock
RRP
21,50 €
-63% Discount
Renthal
Front Sprocket Renthal 520 Z.15 self-cleaning Kawasaki YZ 250 / YZF 450
Article no.: REN-R28952015

Front Sprocket Renthal 520 Z.15 self-cleaning Kawasaki YZ 250 / YZF 450

19,00 €
In stock
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

18,00 €
In stock
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

22,00 €
In stock
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

22,00 €
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

49,00 €
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

24,00 €
In stock
RRP
33,00 €
-27% 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

57,00 €
In stock
Sale
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

55,50 €
In stock
RRP
68,00 €
-18% Discount
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

50,00 €
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

53,00 €
In stock
65,00 €
-18% 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

53,00 €
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

52,00 €
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

53,00 €
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

52,00 €
In stock
Sale
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

53,00 €
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

1,10 €
In stock
RRP
2,20 €
-50% Discount
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
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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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