I've still got the original 4th gear cog in there at the moment but seeing as the engine has a sufficient amount of power this item will soon be upgraded. I can accelerate up to about 120km/h in 3rd. SIP man Robert, Kissing, : “I've put the DRT 1st, 2nd and 3rd gears into my powerful 210cc motor. The SIP spacers allow elimination of any unnecessarily large end float clearances. SIP-TIP: Do not forget to order a new cruciform, selector rod and fresh gear box oil when replacing the gear cogs on your output shaft. Even longer distance touring riders have quickly learned the benefits of an improved transmission ratio setup. Some of the gears are designed to fit the PE and the EFL gearing.Ĭonclusion: If you are into sprint and/ or circuit racing on VESPAs there is no logical way around these conversion output shaft gear cogs. This one comes in an even better steel which is robust and flexible at the same time. DRT have even gone one shorter than was possible up till now with a fourth gear cog that has just 37 teeth. 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 you will appreciate the use of the shorter fourth gear cog. Thank you 3. And a sprocket is a cogwheel that links to another cogwheel by means of a chain. A gear is a cogwheel used to mesh with another cogwheel. For the use of an even taller fourth gear to be effective, they are often included in the more torque orientated motor setups that include the POLOSSI cylinder kit for example. In the strict sense, a 'cog' is a tooth on a wheel. For successful use of the taller fourth gear cogs that are available a stronger motor or a shorter primary driven/ clutch cog gear ratio is necessary. The longer first, second and third gears work well in tuned 166-177cc/ 208-120cc motor setups in combination with the standard size fourth gear and original primary driven/ clutch cog gears.
The gear boxes can then be much more finely tuned, providing the perfect gear ratios for every motor. They are available in larger and smaller versions than the original PIAGGIO items so providing optimal supplementary variations to the already existing range of output shaft gear cog sizes. The cogs have had metal removed in certain places to reduce overall weight and are precisely manufactured and finished. This makes them especially suited to the more hard working environment of a performance orientated motor and also noticeably more durable. The gear cogs are made of a tougher grade of steel and then hardened. 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. 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 finest tuning items are made in small production runs and the precision just like the quality are high end.
#GEAR VS COG FREE#
Low gear = lower ratio = bigger cog on cassetteįeel free to contact me in Twitter about suggestions, improvements, and why not riding bikes in general.Denis Innocente has been actively involved in the VESPA racing scene for over 20 years.
High gear = high ratio = smaller cog on cassette change riding style (from road to gravel, hillier/flatter routes, etc.)Ĭadence = revolutions of the crank arm per minute. Fine tuning can then be applied if the intention is to e.g. Often, when doing a 2x to 1x conversion, a combination of a 1x chainring and a cassette is sought so that the ratios fall pretty much in line with what the rider is used to in the current 2x setup.
The comparison in the Diff column is made between your chosen 1x cassette (orange), and the blue cells from your 2x setup. Gears of different sizes produce a change in torque, creating a mechanical advantage, through their gear ratio, and thus may be considered a simple machine. Geared devices can change the speed, torque, and direction of a power source. one seldom rides with the smaller chainring & smallest cog on cassette). A gear may also be known informally as a cog.
The SKM Witte Lhmer GmbH delivers parts for conveyor equipment under highest Quality and. Your highest gear (42 - 11) will have an easier ratio (feels lighter), but you'll ride slower with it (given the same cadence).īlue colors indicate "most used gears" (e.g. Gear Wheels Manufacture of Toothed Wheels Internal Gears. The color is not an indication of better/worse, but merely a visual aid to show how your selections affect the ratios.įor example, if you change a 50-34 chainring to a 42 but keep a 11-28 cassette, your lowest gear (42 - 28) will have a tougher ratio (feels heavier), but you'll ride faster with it. The Diff column shows red for slower/easier gear, and green for faster/tougher gear. Data shows chainring/cog ratios, and speed at cadence 90 in parenthesis for a 29" (700c, 622mm) wheel size.
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