Question from D. Gerards:
"I would like to fit a new rear shock in my old frame, what do I need to look out for when buying?"
Answer: There are a few things to consider: some basic considerations and some technical details. First of all, you have to make the basic decision as to whether you want to use an air or steel spring shock absorber. An air shock has the advantage that you don't have to worry about the spring stiffness because you can adjust it via the air pressure. Air shocks are also lighter. The spring rate is important for steel spring shock absorbers and you have to calculate it. The Internet offers support here (e.g. www.mtb-biking.de under the heading Workshop).
You also need to consider which adjustment options are important to you. Rebound, compression and bob suppression are now standard on high-quality shocks. Note: Some manufacturers now offer their shocks with different rebound and compression settings. So you need to know whether you generally prefer a lot or a little damping. The following dimensions must match on the old and new shock: Damper stroke (1), installation length (2) and width of the installation bushings (3). Please note: If the width of the mount changes on the new shock, the old bushes cannot be used again. Very important: The frame must offer enough space to accommodate the new shock. Equalising reservoirs, protruding air valves and knobs can be problematic. You should take precise measurements here to avoid any nasty surprises. The installation direction of the shock absorber is irrelevant.
Photo: Daniel Simon
