5mm Allen key for Trek Madone SL and SLR frames

This extension has a 5mm hexagonal socket with the distinctive feature of being round over several centimetres. This allows you to tighten (or loosen) your Trek Madone SL or SLR seat post without damaging the frame groove. This is because a 5mm hex key rubs against the frame when tightening. It is therefore essential to use this extension. It can also be used to provide easier access to the clamping screw on a lever. This extension fits perfectly on the Trek torque wrench that you receive when you purchase your bike.

Technical specifications

- 5mm hex extension, length 50mm - For tightening Trek Madone SL and SLR seat posts - Round section several centimetres long to prevent contact with the frame - Unior brand