Void - air shock from BOS

Void is the first DH air shock produced by Bos. I may seem surprising for those who know well the company, as it had always upheld the coil spring for DH... so far. Nevertheless, Bos has already produced air shock. Vip'R is not the first. 10 years ago, Bos made a cross country shock for a big bicycle brand. And if Bos stayed focused on coil sprig for DH until now, it never made it a matter of principle. Bos always said that when an air spring would reach the same level of performance and reliability than a coil one, then, there would be no reason to avoid producing it. So, we can guess this is now the case ! Our goal : reach the same working than a coil spring The main problem that engineers faced was that an air spring is progressive : its rate increases while it is compressed. On the contrary a coil spring features a constant rate. If you want to use all the travel and have an efficient control of the shock through damping, this constant rate is a key point. Therefore, Bos couldn't launch an air shock without reaching the same working than a coil shock. Which is now the case. Le main interest of an air shock is obviously the weight. The gap between Stoy RaRe with spring and Void reaches 356 g ! But an air spring also provides other advantages : You don't need any more to wonder about what spring rate you will have to elect depending on your weight. It's a big step, especially with Bos shocks, which feature very precise damping, and therefore need the same level of precision for the springs, with steps of 25 lbs / inch. A pneumatic bumpstop We already explained that the air spring from Bos featured a rate curve similar to a coil. Nevertheless, when you reach the last millimeters of strike, the rate raises. Which explains why there is no hydraulic bump stop in the Void, and neither rubber on the rod. That way, the air spring also acts as a true pneumatic bump stop. But with a huge difference compared to the rubber item. With a coil spring the rate increases suddenly when the rubber is compressed. With the air spring, the rate rises smoothly. Moreover, this rate progressiveness is adjustable, through the volume of the air chamber. As same as with Vip'R, it's fast and easy to set up the volume on Void, and it doesn't require any tool. Five ways of setting Specs Piggy back hydraulic shock Air spring Available length x stroke : 222 x 68 / 240 x75 / 267 x 89 Internal valving specific for each bike Hydraulic settings : High speed compression Low speed compression Rebound Pneumatic settings : Pressure (spring rate) Volume (progressiveness) Needle bearing mounting kit weight : 519 g (240 mm) without mounting kit. See more at: http://www.bosmtb.com/