Those are the bright purple lines shown in the close-up detail images ( below), and the actual instant center is shown in bright green. Next, we need to draw some lines through our pivots to find the “instant center,” or the point at which those lines intersect. To start working out anti-rise, first draw a horizontal line straight through that center of gravity point, then draw a vertical line straight up from your front axle. This is not a true fixed point (because people come in different shapes and sizes, and they move around). Really bitchin’ suspension systems like 3VO account for this. The center of gravity or “CG” can be viewed as a horizontal line many bike nerds believe lives 600-800mm above your bottom bracket center. Check it out as the line labeled “CG” on the screen captures. On a bicycle the vertical height of that “center of gravity” is very important. There are three kinds of bikes in the world when it comes to squeezing your rear brake lever: ones that compress their rear suspension or “dive,” ones that firm up their rear suspension or “rise,” and ones that ignore the brake and let the suspension work the same whether the brake is being applied or not.ĭrawings go a long way to help with this, so I put together a hypothetical bike using Linkage, a program used by a lot of designers for calculations. It’s usually better to set aside the vague terms and instead think about how your bike behaves. One bike will have more “anti-rise” than another, but if your wheel goes up and down when you hit stuff and you have a rear brake, you’re in on the party. Whether you’re seeing the term “anti-rise” or “anti-dive” (opposite way of measuring the same basic thing), all suspension systems with rear brakes have it. “Anti-rise” isn’t a feature found on only some bikes. So, that would be the trait of a suspension system that resists suspension extension under mass (meaning “weight”) transfer during braking.Ĭurrie: These days, mostly a marketing term. KRUEGER: Well, it could mean a few things in this context, but in the bicycle world, it generally refers to the concept of designing a suspension not to extend under braking forces. The Anti-Rise is the propensity of a suspension to stay active under braking conditions by counteracting this brake jack using appropriate pivot placement. Benoit ( MTB Engineer, Cycles Devinci), Tim Krueger ( Managing Partner, Esker Cycles), Tyler Cloward ( Director of Product Development, Fezzari) and George Parry ( Engineering Manager, Niner Bikes), ( Tim Krueger, ) and (īIKERUMOR: In simple terms, what is “Anti-Rise”?īENOIT: When braking, the force created by the decelerating mass of the rider causes the rear end to ‘rise’. While it sounds like a simple inverse, it’s actually quite different as it has little to do with pedaling force, and much more to do with braking forces and the subsequent shift of your weight.įor this installment, we have answers from Chris Currie ( President, Speedgoat Designs and the guy behind the new Jamis 3VO suspension), Christophe R. Last time, we talked about Anti-Squat, which is a frame’s rear suspension design’s resistance to compression under acceleration and pedaling forces. Support us! BikeRumor may earn a small commission from affiliate links in this article.
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