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Mountain Bike Rear Suspension Systems

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From Quick Guide: Shocks 101

Summary: Learn tips on mountain bike rear suspension systems in this free online bicycle parts and maintenance video.

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1,896
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By Mickey Denoncourt
eHow Presenter

Mickey Denoncourt received a degree in applied physiology from Hampshire College in Amherst, Massachusetts. Mickey is a Category 3 road racer, Semi-professional DH mountain bike racer...read more

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Video Transcript

"Over here, we've got a downhill bike. It's got coil springs in the front--you can't see them, they're inside the fork, but there's a coil spring in there that gives this thing eight monster inches of travel. There's a coil spring here on the back. It's a two and a half inch spring that gives this bike seven and a quarter inches of travel. So, the reason that I've chosen to have coil springs on this bike--there's two reasons. One, for longer travel applications, the stiction, the static friction on the seal heads for the larger seals and everything is really great, so it's not as smooth riding. The big thing is, because air is a fluid, it heats up as its moved and compressed, like it would be as the spring member in the shock. So, as you're riding down your 2,000 foot mountain over the course of five minutes, your spring rate is getting harder and harder. So, it causes inconsistencies in damping. That's why, for real extreme use, most people will choose a coil spring shock. You can use an air spring shock--they make air spring shocks for this application. In most peoples experience, they are not as reliable yet and don't work as well as coil shocks. But for light use, or especially lighter riders, someone who's 85 pounds as opposed to 170 pounds--they could be the way to go, because there's such a significant difference in weight. I mean a coil spring, by itself, weighs more than an air shock, so it's a real big weight difference."

eHow Article: Mountain Bike Rear Suspension Systems

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