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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
paddle tire
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[QUOTE="Feanor, post: 1419993, member: 55364"] Both sides of the argument "seem" correct... That sand has greater rolling resistance than pavement of course is true, and the motor will use more power to move the bike thru sand. That the motor will suffer and fail with a paddle tire in sand may also be true, depending... The truth is, you can blow up your kdx in sand with a normal knobby as well because your traction will be so low and your rolling resistance so high that you'll constantly need to be turning very high rpm to get into the rpm range to need to spin the tire fast enough to produce enough thrust to gain enough speed to get on top of the sand... Etc etc... Riding fast in sand is all about developing enough speed to become stable and efficient to get over the threshold beyond where your front tire is plowing. Because a normal knobby rear has little tracrion on sand it is akways spinning madly and the engine screaming often to build up that thrust. Very high rpm + low speed and airflow = bad for motor On the flip side, a six paddle rear (8 is almost too many even for a 220) has far more traction and thrust develops much faster with lower rpm, however, because the rear spins in the sand so much less than a knobby, you can never get out of the lower gears very fast and the "window" for optimal speed vs rpm vs gear is very very narrow... You'll spend far more time and effort hunting for that necessary perfect situation with a paddle whereas a much wider range of rpm, gear, speed and traction will "work" with a knobby... The best solution? Leave the paddles to the quads and 4stroke bikes, and use a soft terrain or sand knobby... Michelin S series rear work great! Very soft terrain knobbies are essentially low profile paddle tires with 50 paddles :) the knobbies are arranged in "walls" rather than staggered like a harder terrain knobby. The rear will spin up to allow you to get into an rpm band early while having enough thrust to get the bike up to speed where it starts to float over the sand in a gear that allows you to build up enough speed efficiently to become stable, all with adequate airflow generated for cooling to keep the motor happy. This description above is not based on any scientific theorizing, but just on many hours at Pismo Beach with different kinds of rear tires on an 04 KDX 220 :) Sand is fun! Sea water corrosion is not! :( [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
paddle tire
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