Gear Cog 47 teeth DRT 4th gear “4-gear PK”

for Vespa 50 S 3
/
pecial V5B3T 3
/
5B4T 2
/
R (D)/
00 2
/
25 PV 2
/
T3 2
/
K50/
/
S/
L/
/
L/
K80-125 S/
K125/
TS/
/

L/
L2

96,7 mm Product description
DRT
stands for the Denis Racing Team and is a guarantee for race proven gear box components, based on experiences collected in Rally Sport. The racers and mechanics on the Italian sprinting scene swear by the DRT products and these high end gearbox parts are also included in the racing scooters of the-STOFFI racing team.

Well coordinated gear ratios helps your motor deliver its power more smoothly and constantly and can be decisive over a win or loss in a racing situation. It is almost an art, to be able to set your gearing up to remain within the power-band every time you change up to another gear. If you have ever been happily accelerating behind a truck on the motorway just to lose all of your power while attempting to overtake due to the extra wind resistance will appreciate the use of the shorter fourth gear cog.

The
gear cogs
are made of a tougher grade of steel and then hardened. This makes them especially suited to the more hard working environment of a performance orientated motor and also noticeably more durable. The cog teeth are straight cut, CNC machined and have had metal removed to lower the overall weight.

Helpful hint
: If your motor has enough power to give you the impression you could still change up a gear while travelling at top speed, than you could probably do with a taller 4th gear. If the gap between 3rd and 4th gears seems a little too wide, than a shorter top gear will probably help.

Conclusion
: These DRT gear cogs are essential for all serious racers and sprinters. Rally going scooterists have also learnt the benefits of top quality adjustable gear box ratios.

If
you want to raise the ratio of your gear box start with the primary drive gears. Never forget to order a new gear selector cruciform (at best the DRT item) and fresh gear box oil. Last but not least the gear box shaft assembly spacers help you find the ideal output shaft assembly end float for safe and enduring use of your motor.

Depending on your motor type there are the following gear cogs available:

Gear Cog DRT ‘PK 4-gears’

It can be difficult to bridge the gap in ratios between 3rd and 4th gears. In case travelling two-up (with luggage), going up a mountain pass or even overtaking on the motorway is becoming increasingly frustrating, DRT have-in combination with their very own input shaft assemblies- the answer. If the width of your power band does not allow you to bridge the gap between 3rd and 4th gears, then you can consider the use of a
shorter 4th gear
. The
PARMA shortened 4th gear cog
can be used in combination with a DRT input shaft assembly. The use of this high end item also enables even finer gearbox ratio tuning possibilities than can be achieved with the OE PIAGGIO items.
OEM numbers (for comparisons):
new: 8000000021137 – a21137 (previous: ICs 4^ z47 (DRT)