TMD V2 Installation Guide

TMD V2 Installation Guide

Rimpact recommends that all service and installation work be carried out by a professional mechanic. Please see our warranty terms and conditions for guidance on coverage and usage terms.

Important Notes

Always install your TMD in accordance with this installation procedure. Periodically check the torque on the retention bolts with a torque wrench.

Always ensure the the TMD is torqued to 4Nm or to the headset manufacturers recommended settings, which ever figure is higher.

How to Measure for TMD compatibility

TMD requires a minimum steerer length of 180mm. If your set up is smaller than this measurment you'll need to add headset spacers to bridge the gap. To check, measure from from the underside of your fork crown up to the top of your steerer tube where the top cap sits.

Service Guide

You will need:

1) A set of allen keys

2) An 8mm spanner/ wrench

3) A screwdriver, metal bar or punch as long as your head tube

4) A hammer

5) Potentially some extra headset spacers

Bike Preparation:

1) With the wheels of the bike on the floor and your stem still done up tight, remove your existing top cap

2) Remove your star nut using by placing the long metal object, such as a large screwdriver or metal rod, on top of your star nut and hitting the object firmply with the hammer. Be careful to not miss or damage other parts of your bike.

3) Verify the star nut has been completely removed by looking through the fork. There should be no major protrustions from the inside of the tube.

4) Verify a minimum of 2mm, and a maximum of 7mm of steerer tube is protruding from the top of the stem or the last spacer.

TMD Preparation:

Installing the TMD requires finding the

1) remove the bottom cap of the TMD by unthreading by hand. Do not remove the

spring seat!

2) Place the TMD into the steerer tube from the top

3) The ideal fitment is when the thread on the TMD sits 4-5mm inside the bottom face of the CSU. A suitable combination of headset spacers and expander nuts must be used to achieve this. The following process will help to work on this:

if the main bolt protrudes the bottom of the CSU, remove the TMD and install a headset spacer underneath it. Repeat this process until the end of the bolt sits 4-5mm inside the CSU.
If the main bolt sits deeper than 5mm into the CSU, a bolt extender must be used. Remove the TMD, thread an extender on the main bolt. Using a 4mm allen key and a 8mm spanner/wrench tighten the thread expander onto the bolt, reinstall the TMD and check where the end of the thread sits. Repeat the above process until the end of the bolt sits 4-5mm inside the CSU.

Installing the TMD V2:

With the length of the TMD now dialled, remove it from the bike.
With your bike still sat on the floor, loosen the stem bolts so they are no longer holding your headset in preload.
Reinstall the TMD making sure the bottom cap of the TMD is centred on your fork's steerer. Torque to 3-5Nm to preload your headset.
Grab your front brake and rock the bike forwards and backwards. When holding the bike by the headset you should not be able to feel any free play. There could be other sources of movement; such as brake pads moving in callipers, loose axles, loose rotors, loose callipers or worn wheel bearings, but the headset should feel firm but free moving.
Recheck the torque on the TMD. This additional step helps to make sure that if the headset bedded in in the step above, that proper preload is maintained.
Align your bars and front wheel and tighten you stems bolts to your manufacturer's recommended torque.
Tighten the TMD top bolt to 5Nm.
Go ride your bike!