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 SIP-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.
SIP-TIP: 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 SIP 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: