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Primary Driven Gear 65 teeth input shaft DRT for Vespa 125 GT/GTR/Super/TS/150 GL/Sprint/V/Super/160 GS/180 SS/180 Rally/P80-150X/PX80-150 E/Lusso/'98/MY/'11/Cosa 125-150/T5
Part no.: 40432290
Including VAT Free shipping
502g / Piece
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Primary Driven Gear 65 teeth input shaft DRT

for Vespa 125 GT/​GTR/​Super/​TS/​150 GL/​Sprint/​V/​Super/​160 GS/​180 SS/​180 Rally/​P80-150X/​PX80-150 E/​Lusso/​'98/​MY/​'11/​Cosa 125-150/​T5

fits clutch cog 20/​21/​22/​23 teeth
  • with repair kit primary DRT
5 ratings
Including VAT Free shipping
502g / Piece

Product description

The DRT Primary Gear with 65 teeth was developed to lengthen transmissions of large frame Vespas built from 1960 on up to 125/150 cc PX models. The DRT gear has a larger diameter than the PX200 primary 65, and matches the original. It's a perfect fit for all clutch gears with 20/21/22 teeth, though not with the PX200 clutch with 23 teeth.


SIP-TIP: Tried and tested: the combination of longer 4th gear w/ 33 teeth and short primary (65-20) or 4th gear DRT 36 teeth with a 21 or 22 toothed clutch gear.


Feasible Transmission Ratio

PX/T5/Cosa:                                                                                 Oldies:

65-22=2.95    65-21=3.10    65-20=3.25                                        22x65x25x45=5.30

37-21=5.20    37-21=5.45    37-20=5.72                                        22x65x25x44=5.20

36-21=5.06    36-21=5.30    36-20=5.57                                        20x65x27x43=5.17

35-21=4.92    35-21=5.16    35-20=5.40                                        20x65x27x42=5.05

34-21=4.80    34-21=5.00    34-20=5.26

33-21=4.65    33-21=4.86    33-20=5.10


OEM numbers (for comparisons): new: 80000000028792 - a28792 (previous: PRk VelPX 229 z65.060 (PX125-150) - 28792) (DRT)

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Questions & answers

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File name File type Description File size
Technik_Getriebe Technik Getriebe 8,54 MB Download
Technik_Kupplung_Neu Technik Kupplung 2,46 MB Download
Primär vernieten PX Primär neu vernieten und Kupplung montieren PX 14,21 MB Download
Clutch technology Clutch technology 2,96 MB Download
Gear ratio Gear ratio 3,60 MB Download
Gearbox Technology Gearbox technology 9,51 MB Download
Re-rivet primary drive install clutch Re-rivet primary drive install clutch 0,61 MB Download
Übersetzung Übersetzungsverhältnisse 10,33 MB Download
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