It either compresses or extends the suspension. When you travel in speed you most likely brake every now and then. We need to add one more thing to this equation. Here is the theory behind the pedal kickback: Pedal Kickback Calculation You will also hit some bumps while pedaling and then you are generating force at the same time to the system which means that you are same time fighting to get the rear wheel rotating and resisting the bike from compressing. It just happens faster and with greater force if the bicycle is going faster. There is a general opinion that the faster you are going the less pedal kickback you are getting. There is only one thing you need to know: the compression takes place always at the same amount of rotation of the wheel. The lower part of the chain is another case. I’m only talking about the top part of the chain. When the suspension compresses, chain needs to “grow” or give out from either end of the chain. The chain is connected between the chainring and the cassette. When bicycle is designed to use AS the swing arm is on a different axle than the cranks. Pedal-Kickback effect is a byproduct of anti-squat characteristics of the suspension. Pedal-Kickback means the result of chain growth rotating the cranks backwards during suspension compress. The bike can have 100% AS in one point of travel but it can not maintain it. ![]() With 100% AS suspension won’t neither extend nor compress.ġ00% of AS is impossible to maintain. We’ve learned that if the bike has less than 100% AS it’s easier to control the forces with shock tuning. ![]() Under 100% AS means tendency to compress under acceleration. Also the suspension is harder to tune for downhill riding because of the extending forces of the AS. What we’ve learned from our testing is that, if the AS is more than 100% it needs more effort to pedal uphill since the pedaling effect wants to lift rider weight. Over 100% of anti-squat (AS) means suspension will extend under acceleration. It is determined based on actual linkage instant center (IC, pivot point is also used), chain force line and center of mass height. With 100% AS suspension won’t either extend nor compress. ![]() Anti-squat is suspension’s mechanical resistance to compression due to forces from the engine (when on a bicycle human is the engine). Anti Squat (AS)Īnti Squat is a term for suspension engineers to determine how much the suspension mechanism itself is resisting suspension compression. I’ve noticed that it’s not a simple way to explain this but I’ll try. I’ve been part of many discussions about how Anti Squat (later AS) affects the suspension.
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