Torque Wrench: How to Use One Correctly

A torque wrench is only as good as the technique behind it.

Procedure #

1. Set the torque value by rotating the handle to the desired Nm reading (click-type wrenches). Always check the manufacturer’s torque spec for the bolt — usually printed on the part itself or in the manual.
2. Hold the wrench by the handle only. Gripping further up the shaft changes the leverage and the calibration.
3. Pull smoothly and slowly. Don’t jerk. The wrench needs time to register the torque buildup.
4. Stop at the click. Don’t continue past the click “for safety” — you’ll over-torque.
5. For multi-bolt clamps (stem face plate, seatpost saddle clamp), tighten in alternating sequence, working up in stages: first finger-tight on all bolts, then half-torque, then full torque, jumping between bolts.
6. Reset click-type wrenches to their lowest setting when you put them away. Stored wound up, the spring loses calibration over months.

Torque specs to memorize for routine work:

• Stem clamp on steerer: 5 Nm (carbon) to 6 Nm (alloy)
• Stem face plate on bars: 5 Nm carbon, 6 Nm alloy
• Seatpost clamp: 5–6 Nm typical
• Saddle rail clamp: 5–7 Nm (check post spec)
• Disc rotor bolts: 6 Nm (Centerlock lockring: 40 Nm)
• Bottle cage bolts: 3 Nm
• Brake/shifter clamp on bars: 5 Nm
• Pedal axle: 35–40 Nm
• Cassette lockring: 40 Nm
• Crank arm pinch bolts (Hollowtech II): 12–14 Nm each

When in doubt, look it up. Torque specs are usually printed near the bolt or stamped on the part.