WRENCHES TORQUE

What are they?

Torque wrenches are tools used to tighten nuts or bolts to a specific pressure. They measure the amount of force applied – in Newton-metres (Nm) or inch-pounds (in-lbs) – and indicate when the desired setting is reached. Most torque wrenches have a directional switch, allowing them to be used with both right- and left-hand threads.

Why are they needed?

Using a torque wrench you can tighten a bolt to the exact pressure specified by the manufacturer, so you won’t cause damage and the part shouldn’t come undone. Too much pressure can round-out the bolt head or cause damage, especially where carbon fibre is involved. Too little force and the bolt may come loose and the part could slip or come undone.

Where do you use them?

Most bolts on a bike have a torque setting. This is often marked on the part in question – especially in the case of stems, seatpost clamps and crank bolts. If not, it can be found in the manufacturer’s instructions. Dropper posts are particularly sensitive – using the correct torque setting will help ensure yours works smoothly and doesn’t move within the seat tube.

How do you use them?

Check the torque setting on the part and choose either a large (20Nm+) or small (usually under 20Nm) torque wrench. Adjust it to the correct force, attach the correct socket or bit (e.g. a 5mm Allen key) and place it squarely on the bolt. Start doing up the part. When the required torque setting is reached, the head of the torque wrench will bend over at an angle.