fl hub...fl rear hub installation of freehub body, pawls, and pawl springs y remove the drive side...
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FL Rear HubInstallation of Freehub Body, Pawls, and Pawl SpringsRemove the drive side end cap by using two 5mm hex wrenches, one in each end cap. If the non‐drive side end cap loosens first, remove the drive side end cap by clamping the exposed non‐drive side axle using a good quality axle vice. Be sure not to damageaxle threads by using the appropriately sized clamp. We recommend the use of a Park Tool AV4 Axle Vise. There is a picture of a Park Tool AV4 (See Fig. 4) in this document for your reference. See Figure 2 for 3D exploded diagram of rear hub.
NOTE: If you have an early model hub with an axle that has slotted ends, DO NOT USE the slots to remove the end caps. Use only an axle vise (See Fig. 4).
Slide the free hub body assembly and the shim washer off of the axle. Carefully pry off the seal covering the pawls and springs.Note: this seal has a metal base. Be sure not to bend it when removing and re‐installing. A damaged seal may lead to contamination of the freehub drive system and/or lead to excess resistance when rolling.
Note the installation direction of pawls and springs (Fig. 4B). Using a small set of needle nose pliers remove the pawls and pawl springs. If the drive system is contaminated with dirt or spent grease, clean thoroughly. Install new pawls and springs in the correct orientation (Fig. 4B). Lightly grease the new pawl’s tooth surface and free hub body ratchet teeth with quality bearing grease. Ritchey Bearing Grease, or Phil Wood Waterproof Grease is a good example.
Be sure that all axle bearing surfaces are clean and dry before re‐installing the free hub body. Reinstall shim washer, free hub body, and end caps. End cap torque specification: drive side: 100kgf ; non‐drive side: 110kgf . You may reference hub model’s explodeddrawing in this document for correct assembly (Fig. 2). Be sure that all seals and dust caps are in their correct position, and there is no undue resistance when turning the axle and free hub body after assembly.
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FL Freehub kit includes freehub body, pawls ,springs, shim, and seal.
FL HubsInstallation of Hub Shell Bearings
Remove the drive side end cap by using two 5mm hex wrenches, one in each end cap. If the non‐drive side end cap loosens first, remove the drive side end cap by clamping the exposed non‐drive side axle using a good quality axle vice. Be sure not to damage axle threads by using the appropriately sized clamp. We recommend the use of a Park Tool AV4 Axle Vise (Fig.4). There is a picture of a Park Tool AV4 in this document for your reference. See Figures 1, 1b, and 2 for 3D exploded diagrams of hubs.
NOTE: If you have an early model hub with an axle that has slotted ends, DO NOT USE the slots to remove the end caps. Use only an axle vise.
Note: On some front hub applications, the end caps may be snap fit. You will be able to directly pull the end caps off by hand to expose the hub shell bearings. It may take a firm grip. It’s recommended not to use a hard tool to pry the cap off to avoid damage to end cap, hub shell, bearing, and seal.
On rear hubs, slide the free hub body assembly and the shim washer off of the axle.
While holding the hub shell firmly, use a soft blow plastic or wooden hammer to tap on the non‐drive end of the axle to drive out the opposing bearing. Be sure not to hit the axle so hard as to deform it’s shape or damage the integrity of the threads. The axle is now free with the drive bearing still attached. Remove the bearing from the axle. Re‐install the axle in the hub shell to drive out the remaining bearing.
Be sure that all hub shell and axle bearing surfaces are clean and dry before installing new parts. When re‐installing bearings we recommend a sealed bearing installation tool for proper bearing alignment. The FL Hubs use a proprietary, Enduro double row angular bearing that MUST be installed with the correct tool to insure proper alignment. This document includes a picture of the Wheel’s Manufacturing Wizard Bearing Press (Fig. 3). In an emergency if a sealed bearing installation tool is not available, a socket tool with the same diameter as the bearing can be used. However, bearing alignment is crucial for proper bearing operation and longevity, so extreme care must be used. Remember to install axle before installing the second bearing! On rear hubs reinstall shim washer, free hub body, and end caps. You may reference hub model exploded drawing in this document for correct assembly (Fig. 2) . End cap torque specification: drive side: 100kgf; non‐drive side: 110kgf. On front hubs re‐install end caps. Be sure that all seals and dust caps are in their correct position, and there is no undue resistance when turning the axle (and free hub body on rear hubs).
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Installation of Axle and End CapsRemove the drive side end cap by using two 5mm hex wrenches, one in each end cap. If the non‐drive side end cap loosens first, remove the drive side end cap by clamping the exposed non‐drive side axle using a good quality axle vice. Be sure not to damage axle threads by using the appropriately sized clamp. See Figures 1 and 2 for 3D exploded diagrams of hubs. We recommend the use of a Park Tool AV4 Axle Vise. There is a picture of a Park Tool AV4 in this document for your reference (See Fig. 4).
NOTE: If you have an early model hub with an axle that has slotted ends, DO NOT USE the slots to remove the end caps. Use only an axle vise.
On some front hub applications, the end caps may be snap fit. You will be able to directly pull the end caps off by hand to expose the hub shell bearings. It may take a firm grip. It’s recommended not to use a hard tool to pry the cap off to avoid damage to end cap, hub shell, bearing, and seal.
On rear hubs, slide the free hub body assembly and the shim washer off of the axle.
While holding the hub shell firmly, use a soft blow plastic or wooden hammer to tap on the non‐drive end of the axle to drive out the opposing bearing. Be sure not to hit the axle so hard as to deform it’s shape or damage the integrity of the threads. The axle is now free with the drive bearing still attached. Remove the bearing from the axle. Re‐install the axle in the hub shell to drive out the remaining bearing.
e sure that all hub shell and axle bearing surfaces are clean and dry before installing new parts. When re‐installing bearings we recommend a sealed bearing installation tool for proper bearing alignment. The FL Hubs use a proprietary, Enduro double row angular bearing that MUST be installed with the correct tool to insure proper alignment. This document includes a picture of the Wheel’s Manufacturing Wizard Bearing Press ( See Fig. 3). In an emergency if a sealed bearing installation tool is not available, a socket tool with the same diameter as the bearingcan be used. However, bearing alignment is crucial for proper bearing operation and longevity, so extreme care must be used. Remember to install the new axle before installing the second bearing! On rear hubs reinstall shim washer, free hub body, and end caps. You may reference hub model exploded drawing in this document for correct assembly (Fig. 2). End cap torque specification: drive side: 100kgf; non‐drive side: 110kgf. On front hubs re‐install end caps. Be sure that all seals and dust caps are in their correct position, and there is no undue resistance when turning the axle (and free hub body on rear hubs).
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Fig. 1 FL Front Hub
Part No.213456
DescriptionSerrated end washers
End capsO‐rings
Double Row Angular BearingHub Shell7075 Axle
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Fig. 1b FL Front Hub 15mm QR Type
Part No.1 and 6
2345
Description15mm I.D. End CapsThrust Adjuster
Double Row Angular Bearings7075 AxleHub Shell www.syncros.com
Fig. 2 FL Rear Hub
Part No.1 and 16
23456
7 and 13891011121415
DescriptionSerrated end washers
Left End capDouble Row Angular Bearing
7075 AxleHub Shell
Shim SpacerFreehub Bearings (incl in kit)
Pawls (6)Pawls Springs (6)Freehub Seal
Freehub Bearing Spacer (incl in kit)Freehub BodyEnd Cap SealRight End Cap
FL Hubs: Supplementary Information
FIG.4 Park Tool Axle Vise in use. This tool, or a tool like it, is essential to service the hubs correctly. Make sure to use the center clamp for the inner axles when removing the end caps.
Fig. 4A FL Rear hub shown with freehub seal installed Fig. 4B FL Rear hub shown
with freehub seal removed to show pawls and springs assembly.
Fig. 3 Tools We RecommendThe Wheels Mfg Wizard Bearing Press