In general we recommend to check the hubs of your S-series wheels on a frequent basis by simply checking whether the wheels rotate smoothly in the bike. In case you observe that the wheels do not run smoothly, or in case you identify any noise- or visual issues it is recommended to perform the hub maintenance procedure.

Besides, we recommend to check your hubs with an interval of 5.000 KM or annually. Furthermore, we recommend to change the bearings based on an interval of 10.000KM (this interval is based on normal weather and usage conditions, in the case of usage in rainy conditions the interval should be lowered to 5.000 KM).

The procedure to maintain the hubs and replace the bearings of the S-series hubs is as follows:

S-series front hub

• Untighten the trough axle and remove the wheel from the fork. Next, remove the disc rotor by untightening the lockring.
• Remove the end-caps on both sides of the hub. This can be done by firmly pulling the end-cap. In case the end-cap is stuck, we recommend to rotate the end-cap slightly while pulling it.
• Next, the bearings and axle should be removed from the front hub. The first bearing and axle can be pushed out using  a bearing press (SC2014554 or similar). Discard the removed bearing, it should not be re-used.
• Using the axle, the second bearing and can be pushed out. Discard the removed bearing, it should not be re-used.
• At this stage, we recommend to clean the hub, axle and end-caps with a dry cloth. You may use a degreaser to clean the components. It is important that all parts are clean before the new bearings are installed.
• Take a bearing from bearing kit SC2021249 and place it on top of the bearing seat at the drive side of the hub. Only use little force while placing the bearing on top of the bearing seat, too much force will damage the bearing or hub shell.
• Take the second bearing from bearing kit SC2021249 and slide it in the hub together with the axle to place it on top of the bearing seat at the non-drive side of the hub.
• Take a bearing press (SC2014554 or similar) which is compatible with the 61802 bearing (outer width of 24mm and inner width of 15mm) and the 61902 bearing (outer width of 28mm and inner width of 15mm) and press the bearings into the hub shell. It is important to not apply too much pressure, whenever the bearing is fully seated you will instantly feel that pressing in the bearing further requires more force. Please make sure to stop at this point.
• After installing the bearings, it is recommended to apply some grease on the outside of the bearings. Apply about 1 ML on each bearing as shown on the picture.
• Next, mount the end-caps on both sides by pushing it on the axle while holding the axle in place. A clicking noise will confirm that the end-cap is correctly assembled.
• Take the disc rotor and mount it onto the centerlock spline of the hub. Next take the lockring and screw it in position by hand and finally lock it with a suitable tool while respecting the torque as stated on the lockring.
• Mount the wheel back in the fork.

S-series rear hub

• Untighten the trough axle and remove the wheel from the frame. Next, remove the disc rotor by untightening the lockring.
• 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), spacer and endcap can be taken of the axle of the hub.
• Next, the bearings and axle should be removed from the rear hub. The first bearing and axle can be pushed out using a bearing press (SC2014554 or similar). Discard the removed bearing, it should not be re-used.
• Using the axle, the second bearing and can be pushed out. Discard the removed bearing, it should not be re-used.
• At this stage, we recommend to clean the hub, axle and end-cap with a dry cloth. You may use a degreaser to clean the components. It is important that all parts are clean before the new bearings are installed.
• Take a bearing from bearing kit SC2021250 and place it on top of the bearing seat at the drive side of the hub. Only use little force while placing the bearing on top of the bearing seat, too much force will damage the bearing or hub shell.
• Take the second bearing from bearing kit SC2021250 and slide it in the hub together with the axle to place it on top of the bearing seat at the non-drive side of the hub.
• Take a bearing press (SC2014554 or similar) which is compatible with the 61802 bearing (outer width of 24mm and inner width of 15mm) and the 61902 bearing (outer width of 28mm and inner width of 15mm) and press the bearings into the hub shell. It is important to not apply too much pressure, whenever the bearing is fully seated you will instantly feel that pressing in the bearing further requires more force. Please make sure to stop at this point.
• After installing the bearings, it is recommended to apply some grease on the outside of the bearings. Apply about 1 ML on each bearing.
• Now place the engagement spacer back on the axle.
• Put the freehub body (including cassette and endcap) onto the axle. You can guide the freehub body on 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. A clicking noise will confirm that the end-cap is correctly assembled.
• Take the disc rotor and mount it onto the centerlock spline of the hub. Next take the lockring and screw it in position by hand and finally lock it with a suitable tool while respecting the torque as stated on the lockring.
• Mount the wheel back in the frame according to our instruction manual.