Tools you should have at home
Most of the adjustment work on handlebars and saddles can be done by anyone, and the necessary arsenal of tools is manageable. Here is an overview of what you should have at home.
- Hexagon socket or Torx spanner, depending on the model. The "Y" tool combines the most commonly used sizes 4, 5 and 6 millimetres and saves time on simple jobs; the tool is also available for Torx screws.
- A maximum torque is specified for most connections, which should not be exceeded. A small torque spanner (up to approx. 10 Nm) is therefore mandatory.
- Assembly paste (also known as carbon paste) increases the friction between the parts with small particles and also protects against corrosion. A must for carbon components, but also helps with aluminium handlebars.
- Grease should be applied to all screw threads; it also protects aluminium seat posts from seizing up in metal frames. Keep away from carbon parts!
- A spirit level as an aid for the position of the saddle and handlebars; a tape measure is also useful for some jobs.
The most important torques
- Gear lever 5-6 Nm
- Handlebar clamp 4-6 Nm
- Stem cap 1-2 Nm
- Stem clamp 4-6 Nm
- Seat post 3-5 Nm, varies greatly depending on the clamping principle
- Saddle 5-7 Nm (with two screws)
General professional tips
- Use the torque spanner to develop a feel for how tight the individual screws need to be tightened. This avoids mistakes if you only have a mini tool to hand when travelling.
- Do not use corroded or damaged screws. Grease all screw threads, including under the screw head. This reduces the necessary torque and sensitive components will then clamp securely.
- Some screws are factory-fitted with threadlocker - in this case the thread is not greased. Only apply a little under the screw head.
- Always keep safety-relevant clamps (handlebars, shifters, steerer tube) and carbon parts free of grease! If in doubt, use assembly paste.
- Clamp connections settle after a while and the clamping force of the bolts decreases. You should therefore check the torque and the tightness of the parts after around 200 to 300 kilometres.
The seat post
Carbon seat posts are popular because they are light and comfortable. Many cases of damage are caused by incorrect assembly. Read here how to avoid damage.
Clamp the seat post carefully
If the seat post clamps over a large area, a low torque is usually sufficient. First tighten classic, round clamps to 3 Nm using a torque spanner. Grip the saddle at the front and rear and try to twist it; for aero seatposts, which cannot twist, give a strong push from above in the direction of the seatpost using your body weight. If the support twists or slips, turn the screw in quarter turns or 0.5 Nm increments. If the support is not tight at 5 Nm, something is wrong. Check whether the seat post has any play in the seat tube; the clamp must not be completely tightened.
Avoid load peaks
The inside of the seat tube must be clean and burr-free, and there should be no sharp edges in the clamping area. The seat post must slide smoothly and without play into the seat tube. Check carbon seatposts in particular regularly for damage in the clamping area; pressure points and small cracks are warning signs.
Note extract
Be sure to observe the maximum extension length markings. A sufficiently long part of the seat post must remain in the seat tube and its end should be below the top tube. Standard diameter seat posts are available in different lengths.
Professional tips for adjusting & maintaining seat posts
Clamps integrated into the frame can cause problems if they are dirty or corroded. They should be disassembled from time to time and the moving parts greased, only then will the torque of the screw be applied as clamping force. Assembly paste should be applied to the clamping surfaces of carbon parts.
If the frame or seat post are made of carbon, never use grease between the seat post and frame! Apply special carbon assembly paste to the meticulously cleaned components. Slipping aluminium posts can also usually be fixed with assembly paste.
These connections can also make noise. Clean everything meticulously and, depending on the material, apply grease or assembly paste under the clamp and to the clamping surfaces themselves.
Jens Klötzer
Editor
