Settings, Introduction, Assembly – Bos STOY RARE 2014 User manual User Manual
Page 3
Thank you for purchasing a Bos Stoy Rare shock. Your shock has been assembled specifically for one bike -
obviously yours ! - which means that the internal valving and the spring rate are settled for your bike. The
adequate mounting kit is also provided with the shock.
Your shock features adequate mounting kits for the bike mentionned while ordering.
Check the mounting way
by refering to the compatibility table, available on bos mtb website :
Refer to the bike manual
to follow the specific shock mounting procedures of your bike.
3.1. COIL SPRING
Spring preload isn’t considered as an adjustment. It’s a base setting which is dictated by your weight. It aims to
adjust the sag (negative travel) on the shock, which is the amount the shock compresses when you sit on the
saddle. It’s measured as a percentage of the shock’s total travel, but can vary from one bike to another depending
on the geometry. BOS’s recommended sag for most bikes is 30% minimum. NB: Don’t forget the sag is measured
on the flat, whereas whenyou’re riding the bike it’s at an angle which reduces the ‘dynamic’(moving) sag.
The BOS Stoy Rare is supplied with a spring to match your weight.
The ideal preload giving 30-40% sag, should be between 0-4mm. If you exceed 4mm then a harder spring is
strongly recommended. If you don’t get the sag, choose a softer spring.
A spring which is too hard or with too much preload can negatively affect the shock’s hydraulic damping and reduce
your bike’s performance.
3.2. HYDRAULIC ADJUSTMENTS
The Stoy shock is a three-way type shock, which means there are three types of damping adjustment: rebound,
low-speed compression and high-speed compression.
Your shock’s basic setting (internal) is designed for your bike’s geometry. We use ten basic settings which cover the
majority of bikes on the market. If a different setting is necessary for a given bike, we will develop it especially.
The purpose of damping adjustments is to use all the shock’s travel without bottoming-out (or only rarely), to give
grip to the rear wheel, but also to stop the bike stalling in holes, and finally to maintain a good position. Below are
the basic settings for your frame. Then it’s up to you to analyse its performance and adjust the settings to suit your
riding style. Do this carefully and methodically, step by step. Only change one setting at a time and only by a few
clicks. If it’s OK, note the setting and type of terrain. If you get confused with the settings, return to the basic
settings and start again.
3. SETTINGS
1. INTRODUCTION
CAUTION
Never try to disassemble your shock. Limit yourself to the instructions given in this manual.
This shock is pressurized, for your own safety, do not try to open it.
Contact an authorized service center for any maintenance operation.
2. ASSEMBLY