BMW also made a frame for Juha Salminen that was with a 'stub axle' set up to the swingarm that made the offset of the counter shaft and swingarm pivot much, much less that a std 'normal bikes' set up - something like only 5 / 10 / 15+?mm away from concentricity. Though, it was a much different frame design and had a quite unique linkage set up - of course the BMW, had no linkage, and a stainless steel frame. I don’t think there is a perfect number, on paper engineers talk about 100% being neutral, but I believe it’s too stiff in some situations. The thing to remember is that AS characteristics is only when you are on the throttle accelerating. You might also tune your shock stiffer for these scenarios but then feel then you’ll feel it stiffer in other areas of the track. The bike will sit in its travel under acceleration, soaks up those bumps out of corners, but front wheel can become light. Then there’s pros and cons of a 50% or 75% AS. It’s mechanically extending the shock where we want it to soak up the bumps. But in scenarios like acceleration bumps or square edge while on throttle, the bike is stiff. Theres pros and cons with 100% or higher AS, like stated the rear wheel digs in and drives the bike forward, the front wheel stays down and has traction. For example, you wouldnt so Yamaha has no “Anti-Squat” because every car, motorcycle, bike, etc has some level of AS. All bikes have some sort of AS, so it’s kinda misleading. Ok I understand now where the confusion is, they are wrapping this into a marketing term. The axle is moving reward and up which is causing the tension. This could squat your shock or like old Honda that had brake arms attached to the caliper, it will level out your shock or even lift it depending on what % is designed into it.Īs for the chain tension on the KTM, the tension point is related to the counter shaft location to the swingarm pivot point. Or going from a 12t to 14t counter shaft could show a big change.Īll bikes have AntiRise also which is the force while using the rear brake. If it’s says 75% or 50% it will sit in its travel, (maybe like a Honda or Yamaha.) this % is changed by moving the countershaft point to the swingarm pivot. If a bike has 100% AS, it should technically be flat under acceleration (say current KTM, is my estimation) If it’s say 150% the rear end might actually rise and extend the shock. It’s not a term that you can say one bike has “anti squat”Īll bikes have different levels of “anti squat” which is what happens under acceleration. Anti Squat is a kinematic term in suspension design.
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