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Transmission

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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 protection Chassis screws Circlip Clutch accessories Clutch kit Crankshaft accessories CVT sliders Engine case accessories Engine cover Front sprocket Gearbox Gearbox accessories Gearbox bearing kit Gearshift lever Ignition lock Kickstarter accessories 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
Brand
AFAM Algi Aprilia Avoc Beta Bidalot Buzzetti Conti CPI Derbi Doppler GY6 Hot Rods IGM Iris Italjet Jasil KMC KRM Kymco Malossi Moose Racing Moto Master MotoForce MotoForce Racing Naraku 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
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

54,50 €
In stock
Doppler
Rear Sprocket 53 teeth - 420 Doppler aluminium CNC gold Rieju MRT
Article no.: CGN491209

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

54,50 €
In stock
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)

2,40 €
In stock
Standard Parts
Chain Pulley Set Aprilia / CPI / Derbi / Gilera
Article no.: 34935

Chain Pulley Set Aprilia / CPI / Derbi / Gilera

8,80 €
In stock
Standard Parts
Chain Tensioners (x2) Tomos A3 / A35
Article no.: 28790

Chain Tensioners (x2) Tomos A3 / A35

5,50 €
In stock
Standard Parts
Rear Sprocket 53 teeth 420 Derbi Derbi DRD Pro
Article no.: 34937

Rear Sprocket 53 teeth 420 Derbi Derbi DRD Pro

25,00 €
In stock
Standard Parts
Secondary Transmission / Output Shaft long - GY6 50cc 139QMB
Article no.: BT16623

Secondary Transmission / Output Shaft long - GY6 50cc 139QMB

12,50 €
In stock
Rieju
Gear Shift Shaft original spare part Rieju RS2
Article no.: OE-RIE2407000

Gear Shift Shaft original spare part Rieju RS2

6,80 €
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

32,50 €
In stock
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

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

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

79,00 €
In stock
Standard Parts
Chain Tensioner left Rieju MX after 2000
Article no.: EKP-126808

Chain Tensioner left Rieju MX after 2000

6,10 €
In stock
Standard Parts
Chain Tensioner right Rieju MX after 2000
Article no.: EKP-126807

Chain Tensioner right Rieju MX after 2000

6,90 €
In stock
Rieju
Chain Tensioner OEM quality Rieju 50
Article no.: EKP-126742

Chain Tensioner OEM quality Rieju 50

13,50 €
In stock
Piaggio
Gear, primary shaft Piaggio ZIP SP2, 14 teeth
Article no.: OE-PIA4795715

Gear, primary shaft Piaggio ZIP SP2, 14 teeth

67,00 €
In stock
RRP
134,00 €
-50% Discount
Piaggio
Roller bearing / needle bearing (HK1516) Piaggio 125/150/180
Article no.: OE-PIA430228

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

5,50 €
In stock
RMS
Output shaft type A, B, Piaggio old engine, with nut, cap, split-pin (Ref. 100240090)
Article no.: R100240090

Output shaft type A, B, Piaggio old engine, with nut, cap, split-pin (Ref. 100240090)

38,00 €
In stock
Polini
Primary gear kit Polini, Piaggio Zip SP 2000 Zip Cat II, Vespa ET2 (2000), Zip SP 2000 (16/37)
Article no.: P202.1392
1

Primary gear kit Polini, Piaggio Zip SP 2000 Zip Cat II, Vespa ET2 (2000), Zip SP 2000 (16/37)

80,50 €
In stock
Italjet
Intermediate shaft Italjet Formula
Article no.: OE-ITJ337100101

Intermediate shaft Italjet Formula

40,50 €
In stock
RRP
81,00 €
-50% Discount
GY6
Gear input shaft (clutch) - GY6 50cc 139QMB
Article no.: OE-GY6BT13868

Gear input shaft (clutch) - GY6 50cc 139QMB

12,50 €
In stock
Aprilia
Blue steel washer for intermediate shaft Minarelli, 14x29x1mm
Article no.: OE-AP8206195

Blue steel washer for intermediate shaft Minarelli, 14x29x1mm

4,60 €
In stock
Aprilia
Belleville Spring for intermediate shaft Minarelli, 14x29x0.2mm
Article no.: OE-AP8206150

Belleville Spring for intermediate shaft Minarelli, 14x29x0.2mm

4,30 €
In stock
CPI
Primary gear shaft (clutch) CPI - China 2-stroke, CPI, 13 teeth, version 1
Article no.: OE-CPI20913

Primary gear shaft (clutch) CPI - China 2-stroke, CPI, 13 teeth, version 1

23,50 €
In stock
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

17,50 €
In stock
Standard Parts
Chain Master Link Scooter-Attack chain 428, reinforced, gold
Article no.: L-SA485376

Chain Master Link Scooter-Attack chain 428, reinforced, gold

3,40 €
In stock
AFAM
Chain Master Link reinforced Afam for chain 415
Article no.: L-SA485371

Chain Master Link reinforced Afam for chain 415

2,30 €
In stock
Standard Parts
Retainer Plate for sprocket 11 teeth special Derbi Euro 2 / Euro 3
Article no.: CGN490398

Retainer Plate for sprocket 11 teeth special Derbi Euro 2 / Euro 3

4,50 €
In stock
Doppler
Chain Kit aluminium gold 13x53 - 420 Doppler Rieju MRT
Article no.: CGN491213
5

Chain Kit aluminium gold 13x53 - 420 Doppler Rieju MRT

99,00 €
In stock
RMS
Driveshaft RMS Vespa PX / PXE 125 - 200cc
Article no.: R100240120

Driveshaft RMS Vespa PX / PXE 125 - 200cc

52,50 €
In stock
RRP
105,00 €
-50% Discount
RMS
Gear Selector Box RMS Vespa PX 125 - 200cc Arcobaleno (VNX2T-VLX1T-VXS1T-VNR1T)
Article no.: R100221020

Gear Selector Box RMS Vespa PX 125 - 200cc Arcobaleno (VNX2T-VLX1T-VXS1T-VNR1T)

8,80 €
In stock
RRP
17,50 €
-50% Discount
RMS
Gear Selector 3-speed RMS (h=51mm) RMS Vespa 50 - 90cc
Article no.: R100220120

Gear Selector 3-speed RMS (h=51mm) RMS Vespa 50 - 90cc

26,50 €
In stock
RRP
52,50 €
-50% Discount
Polini
Primary Transmission Polini 15/38 (gear ratio = 2.53 / +22.9%) Vespa ET2 98 / LX 50cc
Article no.: P202.1405

Primary Transmission Polini 15/38 (gear ratio = 2.53 / +22.9%) Vespa ET2 98 / LX 50cc

80,50 €
In stock
Polini
Primary Transmission Polini 24/61 helical Vespa 125 PK / Primavera
Article no.: P202.1220

Primary Transmission Polini 24/61 helical Vespa 125 PK / Primavera

64,00 €
In stock
Polini
Primary Transmission Polini 14/39 Piaggio Diesis / Zip LC after 2000
Article no.: P202.1407

Primary Transmission Polini 14/39 Piaggio Diesis / Zip LC after 2000

80,50 €
In stock
Derbi
Front Sprocket 11 teeth Derbi Euro 3 (D50B0)
Article no.: OE-DE86177R

Front Sprocket 11 teeth Derbi Euro 3 (D50B0)

14,00 €
In stock
Derbi
Gear Selector Shaft Derbi Euro 3 (D50B0)
Article no.: OE-DE847236

Gear Selector Shaft Derbi Euro 3 (D50B0)

97,00 €
In stock
Derbi
Lever for gear selector shaft Derbi Euro 3 (D50B0)
Article no.: OE-DE847068
1

Lever for gear selector shaft Derbi Euro 3 (D50B0)

15,50 €
In stock
Standard Parts
Chain Kit 12x53 - 420 d=108mm 6 holes Derbi Senda SM / DRD
Article no.: CGN486688
1

Chain Kit 12x53 - 420 d=108mm 6 holes Derbi Senda SM / DRD

48,00 €
In stock
Algi
Chain Tensioner 5x0.80mm MBK
Article no.: CGN8893

Chain Tensioner 5x0.80mm MBK

1,80 €
In stock
Algi
Chain Tensioner with locking nut Nylstop MBK
Article no.: CGN8892

Chain Tensioner with locking nut Nylstop MBK

3,00 €
In stock
Algi
Chain Tensioner Peugeot 103 / MVL / Vogue / SPX / RCX
Article no.: CGN8889
1

Chain Tensioner Peugeot 103 / MVL / Vogue / SPX / RCX

3,40 €
In stock
Standard Parts
Chain Tensioner Peugeot Vogue / 103 / MVL
Article no.: CGN480894

Chain Tensioner Peugeot Vogue / 103 / MVL

5,60 €
In stock
Standard Parts
Chain Tensioner steel MBK
Article no.: CGN4296

Chain Tensioner steel MBK

25,50 €
In stock
Standard Parts
Rear Sprocket 54 teeth MBK 51S (Grimeca rims d.98mm)
Article no.: CGN2972
2

Rear Sprocket 54 teeth MBK 51S (Grimeca rims d.98mm)

15,50 €
In stock
Standard Parts
Rear Sprocket 56 teeth Peugeot 103 SP / MV (RYS rims d.94mm)
Article no.: CGN2936
1

Rear Sprocket 56 teeth Peugeot 103 SP / MV (RYS rims d.94mm)

15,50 €
In stock
Standard Parts
Rear Sprocket 54 teeth MBK 68 / 88 / 89 (d.110mm)
Article no.: CGN2963

Rear Sprocket 54 teeth MBK 68 / 88 / 89 (d.110mm)

15,50 €
In stock
Standard Parts
Rear Sprocket 52 teeth Peugeot 103 SP / MV (d.94mm)
Article no.: CGN2935
1

Rear Sprocket 52 teeth Peugeot 103 SP / MV (d.94mm)

15,50 €
In stock
Standard Parts
Chain Tensioner Piaggio Ciao PX / Bravo
Article no.: CGN3223

Chain Tensioner Piaggio Ciao PX / Bravo

11,50 €
In stock
Standard Parts
Rear Sprocket 44 teeth MBK 40 / 50 (d.94mm)
Article no.: CGN2957

Rear Sprocket 44 teeth MBK 40 / 50 (d.94mm)

14,50 €
In stock
Standard Parts
Rear Sprocket 56 teeth Peugeot 103 SPX / RCX (Grimeca rims d.98mm)
Article no.: CGN2954

Rear Sprocket 56 teeth Peugeot 103 SPX / RCX (Grimeca rims d.98mm)

19,50 €
In stock
Standard Parts
Rear Sprocket 48 teeth Peugeot 103 SP / MV (d.94mm)
Article no.: CGN2934

Rear Sprocket 48 teeth Peugeot 103 SP / MV (d.94mm)

15,50 €
In stock
Standard Parts
Rear Sprocket 54 teeth Peugeot 103 SPX / RCX (Grimeca rims d.98mm)
Article no.: CGN2953

Rear Sprocket 54 teeth Peugeot 103 SPX / RCX (Grimeca rims d.98mm)

15,50 €
In stock
Standard Parts
Rear Sprocket 45 teeth Peugeot 103 SP / MV (d.94mm)
Article no.: CGN2933

Rear Sprocket 45 teeth Peugeot 103 SP / MV (d.94mm)

13,50 €
In stock
Standard Parts
Rear Sprocket 45 teeth Peugeot 103 SPX / RCX (Grimeca rims d.98mm)
Article no.: CGN2949

Rear Sprocket 45 teeth Peugeot 103 SPX / RCX (Grimeca rims d.98mm)

13,50 €
In stock
Standard Parts
Rear Sprocket BTS 56 teeth Peugeot 103 SP / MVL (pressed steel rims d.94mm)
Article no.: CGN2945
1

Rear Sprocket BTS 56 teeth Peugeot 103 SP / MVL (pressed steel rims d.94mm)

17,00 €
In stock
Standard Parts
Rear Sprocket BTS 54 teeth Peugeot 103 SP / MVL (pressed steel rims d.94mm)
Article no.: CGN2944

Rear Sprocket BTS 54 teeth Peugeot 103 SP / MVL (pressed steel rims d.94mm)

15,50 €
In stock
Doppler
Secondary Transmission 14-41 Doppler Yamaha Aerox / BW's
Article no.: CGN279301
2

Secondary Transmission 14-41 Doppler Yamaha Aerox / BW's

69,00 €
In stock
Doppler
Primary Transmission Doppler 15-50 Yamaha Aerox / BW's
Article no.: CGN263894
1

Primary Transmission Doppler 15-50 Yamaha Aerox / BW's

69,00 €
In stock
Doppler
Primary Transmission Doppler 14-42 Yamaha Aerox / BW's
Article no.: CGN263880
1

Primary Transmission Doppler 14-42 Yamaha Aerox / BW's

69,00 €
In stock
Standard Parts
Retaining Plate f. sprocket Derbi Euro 2 / Euro 3
Article no.: CGN484861
2

Retaining Plate f. sprocket Derbi Euro 2 / Euro 3

4,50 €
In stock
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54

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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