ADAPTRAC changes mountain bikes' tire pressure on the fly
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A mountain bike with the full ADAPTRAC system
ADAPTRAC is a frame-mounted compressed air system that allows mountain bikers to change the air pressure in their tires, as they're riding
The ADAPTRAC control unit and pressure gauges
The ADAPTRAC regulator brings the released compressed air down to 175 psi
Low-friction rotary seals keep air from leaking out while allowing the wheels to spin freely
The ADAPTRAC rear hub
The ADAPTRAC control unit
The ADAPTRAC front hub
Like a lot of other factors involved in mountain biking, setting the air pressure of the tires is a matter of compromise. Keep them too soft, and you can’t go as fast as you’d like on smooth stretches of the trail – keep them too hard, and they’ll just bounce off of roots and rocks instead of gripping them. As it stands, most bikers go for a “Jack of all trades, master of none” setting, that allows for some traction and some speed. The folks at ADAPTRAC, however, apparently think that such a compromise shouldn’t have to be made. Their new system allows riders to inflate or deflate their tires as conditions dictate, while they’re riding.
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