Appendix E - Tightening Torques/Tire Pressure/Lighting Systems 67
Tightening torques of screws, nuts and bolts
Use only suitable tools for tightening screwed components, e.g.
torque wrench, otherwise the screws may shear off.
Parts may be damaged if the screws are over-tightened.
Always observe the specified torque.
Observe the minimum screw depth. In the case of hard aluminium alloys this
must be minimum 1.4 x screw diameter (e.g. nominal diameter M 5 x 1.4 = 7 mm).
All screws, nuts and bolts that are relevant to safety should be tightened
with a torque wrench. This indicates the corresponding torque in Nm
(Newton meter).
Regarding tightening torques refer to the following priorities:
1st priority: torques that are printed on components by the manufacturer
2nd priority: torques that you can nd in the manufacturers manuals
3rd priority: torques that you can nd in the following list
4th priority torques that are printed on the screws, nuts and bolts heads
Screwed Components Tightening Torque
Pedal crankset, steel 30 Nm
Pedal crankset, aluminium 30 Nm
Pedals 30Nm
Wheel, front 25 Nm
Wheel, rear 40 Nm
Stem clamp spindle 15 Nm
A-head clamping screw 9 Nm
Seat post clamp screw M8 20 Nm
Seat post clamp screw M6 14 Nm
Saddle support clamp 20 Nm
Dynamo mounting 10 Nm
The following are different for carbon frames
Derailleur clamp xing screw 3 Nm*
Gear shoft lever xing screw 3 Nm*
Brake lever xing screw 3 Nm*
Clamp, handlebar - handlebar stem 5 Nm*
Clamp, handlebar - fork shaft 4 Nm*
*We recommend the use of plastic mounting paste under the components
In the case of carbon parts, observe any differing information or
marking regarding the recommended torque.
General tightening torques of screws, nuts and bolts
The screw quality is stamped on the screw head, e.g. 8.8. If the manufacturer’s
specications do not differ, the following torques (average values) apply,
depending on the screw quality. Not all values can be applied to other
manufacturers’ components. Read the component manufacturer’s specications
or observe the torque specications marked on the components.
Tightening torques of Shimano components:
Article Specification Tightening Torque
Rear derailleur (RD) Fixing bolts (derailleur hanger) 8 Nm
Inner cable xing screw 5 Nm
Gear shifter roller xing screw 3 Nm
Front Derailleur (FD) Clip xing screw 5 Nm
Inner cable xing screw 5 Nm
Derailleur on Clip xing screw 3 Nm*
Carbon Frame (FD)
Gear shift lever (STI/SL) Fixing screws 6 Nm
Gear shift lever on Fixing screw 3 Nm
Carbon handlebar
V-brake(BR) Fixingscrew(weldedsocket) 5Nm
Inner cable xing screw 6 Nm
Brake pad xing bolt 8 Nm
Caliper brake (BR) Fixing screw 5 Nm
Inner cable xing screw 6 Nm
Brake pad xing bolt 8 Nm
Cantilever brake (BR) Fixing screw (welded socket) 5 Nm
Inner cable xing screw 6 Nm
Brake pad xing bolt 8 Nm
Brake Lever Clip xing screw 6 Nm
Brake lever on Fixing screw 3 Nm
Rear wheel hub (FH) Freewheeling body xing screws 40 Nm
Inner bearing (BB) BB cup right and left 50 Nm
Inner bearing (BB) Plastic BB cup right and left 30 Nm
Inner bearing (BB) BB cup right and left 50 Nm
Appendix E
Tightening Torques/Tire Pressure/Lighting Systems
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