in­stant ex­pert: ANTI-rise

Mountain Biking UK - - KYRGYZSTAN -

What is it?

When you ap­ply the brakes, your weight shifts for­wards. This causes the fork to com­press and the rear sus­pen­sion to ex­tend, or ‘rise’. Torque from the rear brake, gen­er­ated by the cal­liper ro­tat­ing rel­a­tive to the ro­tor when the sus­pen­sion com­presses, coun­ters this to some ex­tent – a phe­nom­e­non known as ‘anti-rise’.

What af­fects it?

How much anti-rise a bike has de­pends on the po­si­tion of the in­stant cen­tre (see over­leaf). The fur­ther for­ward and lower the IC, the less an­tirise. Twin-link and Horst link de­signs, par­tic­u­larly those with co-ro­tat­ing links, tend to have an IC that’s fur­ther for­ward than on a sin­gle-pivot bike.

What ef­fects does it have? High lev­els of anti-rise cause sus­pen­sion to sit deeper into its travel when brak­ing, which can give pro­gres­sive bikes a firmer feel when you’re on the an­chors. On the plus side, anti-rise helps pre­vent brake dive, by stop­ping the rear sus­pen­sion from ris­ing as much un­der brak­ing.

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