In case you have an Artech or Race Series wheel, your rear wheel hub is equipped with the Diamond Ratchet system from Scope. The sound you hear while freewheeling is caused by the two ratchets that are disengaged while rotating in opposite directions over each other.

In order to reduce the noise, Scope offers Silence Grease (SC2022350). This Silence Grease can be used to replace the regular engagement grease of the Diamond Ratchet system in order to reduce the sound level of the engagement system. The steps to apply the Silence Grease are as follows.

• Remove the rear wheel from your bike by untightening the through axle.
• Remove the end-cap from the drive side, this can be done by pulling the body (including the cassette if mounted) from the hub. The end-cap will come loose and the body (including the cassette) can be taken of the axle of the hub.
• Typically the “small” ratchet will remain to be seated on the backside of the freehub body. If so, please remove the small ratchet from the freehub body by pulling it out of the freehub body.
• Remove the “large” ratchet which is located in the hub shell. Note that the large ratchet could have already come out of the hub shell when removing the body.
• Place  the large and small ratchet on a clean cloth and remove any old grease and dirt using a dry cloth.
• Now take the Silence Grease and apply some of the grease on top of both ratchets. Besides, apply some grease around the ratchets. We recommend to apply about 3 ml of grease, as an indication of the amount of grease please refer to below picture.
• Next, first take the large ratchet and put it on the axle. Please note that the face teeth of the large ratchet should face outwards (meaning they point towards the direction of the drive side / cassette side). Next push the large ratchet into the hub shell against the spring. You should feel the spring pushing back the rachet outwards.
• Take the small ratchet and assemble it back into the freehub body. The face teeth of the ratchet should face outwards, meaning that the face teeth should be visible.
• Next, put the freehub body onto the axle. You can guide the freehub body onto the axle by taking the body and focus on the bearings. The bearings should align with the axle, one could use the index finger to center the body on the axle.
• Now check whether the large ratchet is still seated in the hub shell, if not please guide the large ratchet back into position by slightly pushing it. Next push the freehub body towards the hub, please note that in case the large ratchet is not seated in the hub or the small ratchet is not seated in the freehub body one should stop pushing the body and first seat both ratchets properly.
• Next put back the end-cap back onto the axle. While doing so, hold the axle from the disc side with your other hand. When pushing on the end-cap a clicking noise indicates that the end-cap is mounted correctly.