Tools you should have at home
Most adjustment work on road bike 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!
- Spirit level as an aid for the position of the saddle and handlebars; a tape measure is also useful for some work.
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 road bike handlebar
Road bike handlebars are usually simple but often sensitive parts. To ensure that nothing slips, we show you here how a professional mounts them.
Prepare well
The clamping surfaces of the stem and brake levers must fit precisely, be clean and free of burrs. Always apply a little assembly paste to the clamping point.
Screw evenly
Tighten the stem bolts evenly and only slightly at first until the road bike handlebars are held in position. With a few exceptions (e.g. hinged stems), the slots of the stem clamp must be parallel and of the same width at the top and bottom.
Tighten carefully
Increase the screw torque to a typical 4 to 5 Newton metres. Screw crosswise and in two rounds so that everything sets evenly. More is rarely necessary - or not permitted at all. With the minitool, light manual force with a short lever is sufficient. Check the tight fit by leaning on the handlebar ends with your full weight. The road bike handlebars must not twist.
Approach carefully
The shifters are tricky, as maximum torque is particularly important with carbon handlebars. However, the screws are not always easily accessible. Get a suitable extension or work your way up to the correct torque from below by repeatedly checking that they are tight. To do this, hit the side of the lever with the heel of your hand; the handlebar body must not twist.
Adjusting road bike handlebars: Pro tips
Use road bike handlebars and stem from the same manufacturer. The components are better matched to each other and have usually been tested together.
The upper edge of the brake levers should be horizontal. On many handlebars, the top link forms a straight line with the grips, resulting in a large hand rest. The handlebar ends then run horizontally or point slightly downwards.
The correct handlebar width: The width between the shoulder joints serves as a guide. On aero road bikes, the handlebars tend to be a little narrower, on off-road bikes, the handlebars can also be wider.
Jens Klötzer
Editor
