The Critical Geometry Frame is a breakthrough in cross country low travel suspension technology. This concept uses an unconventional approach to rear suspension on a bicycle. Typical rear suspensions are designed by borrowing technology from heavy vehicle industries like automotive or motorcycle. At ProductM we saw that the bicycle is not a vehicle by itself. For it to properly function it uses a motor (one human being) that is often times up to 8 times heavier that the frame that supports it. In other words the rider on a bicycle has more inertia than the lightweight subframe underneath the rider. So simply put we attach the pedals and the saddle to the rider and let the bicycle float underneath. This innovate design is named the Critical Geometry Frame because it maintains the critical distances of handle bar to rear axle— this keeps the handling of the bike quick; and the distance of the saddle to the pedal— this keeps the riders body from having to do unnatural crunch like activities that happen on a bike where the distance changes.

See below for how the suspension has smart action.

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ProductMCycles.com - The Critical Geometry Frame. A revolutionary bicycle suspension.
Designed by ProductM. US Patent Number 5,553,880. ©2006 Product M. All Rights Reserved.