Bos Vip RVolume User Manual

AIR CHAMBER VOLUME ADJUSTMENT

Preamble

The Bos Vip’R shock is intented for various kinds of rides from All Mountain to light Enduro. It can be adapted to any bike, and comes with a speciﬁc internal setting for your own bike.

Nevertheless, you may want to adapt its progressivity depending of your riding style or your usual tracks. If you ride mostly downhill, for example, you may want to increase the SAG of your bike, may be also seeking comfort, thus, you wanna use more O’rings in the air chamber. It will allow you to use the whole travel without bottoming out.

In the other way, you may want to decrese the SAG to get a more responsive bike, or more efﬁcient while depaling.

As a general rule, by modifying the air chamnber volume you will act on the behaviour of the shock in the second second half of its travel.

We advise to make stages of two O’rings added or taken off at the same time at the beginning, then be more precise.

Parts & tools :

One « O’ring kit for progressivity setup », containing 5 O’rings. A bench vice with soft jaws (picture 1).

Warning :

Use exclusively the O’rings provided by BOS. The diameter and the thickness are very speciﬁc.

Procedure

1. Insert the shock in the jaws of the vice as shown on picture 2

2. Tighten slightly to avoid damaging the shock.

Warning : make sure that the jaws are tighten on a ﬂat surface, and that they don’t damage the rebound knob.

2. Take good note of the current air pressure of your shock (consider the air loss when using the pump) before to deﬂate it completelly.

3. Unscrew the air chamber (a), while maintening the main cylinder (b) in its position (picture 3 & 4).

DO NOT TRY TO UNSCREW THE CYLINDER. PROCEED BY HANDS. DO NOT USE ANY TOOL. Take off the air chamber (picture 5).

4. Insert the O’ring(s) through the cylinders to their position (arrow) (pictures 6 & 7).

Warning : the O’rings or the grease must not obstruct the holes on top of the air chamber (picture 8).

5. Close the air chamber, by screwing untill the end, without tightenning hard.

6. Chack if the sticker and the rebound knob are well aligned (picture 9). This is the sign of a perfect tightening torque.

7. Inﬂate the shock to the pressure previously noticed.

8. Mount it back on the bike.

9. Proceed to the air chamber balance (see the Vip’R owner manual).

Bos MTB - 4, impasse Léonce Couture - F-31200 Toulouse tel : +33 (0) 534 25 33 66 - fax : +33 (0) 534 25 33 60 email : info@bosmtb.com - website : www.bosmtb.com