When your rear wheel starts making a dry crunching sound or dragging as you coast, the culprit is usually worn-out cartridge bearings inside your freehub body. Replacing them before they seize completely saves you from scoring the axle or buying an expensive replacement assembly.
Hunt Bike Wheels use specific cartridge bearing sizes depending on the hub model (such as Sprint, Mason, or Rapid Enforcer variants). Doing this job at home doesn't require a full machine shop, but it demands patience, the right drifts, and a proper bearing press. Here's how to do it cleanly without damaging alloy freehub bodies or seating the new bearings crooked.
Tools and Supplies Needed
Before tearing down your rear hub, gather the necessary specialty tools. Improvising with flathead screwdrivers and hammers often leads to gouged aluminum shells.
- Bearing press kit: Ensure it includes threaded rods, washers, and flat drifts matching your exact bearing outer diameter.
- Bearing punches or a slim brass drift: For tapping out stubborn cartridge bearings from the opposite side.
- Hex keys (usually 5mm): For removing end caps.
- Clean shop rags and isopropyl alcohol: For degreasing internal cavities.
- Fresh waterproof grease: To coat the axle and bearing seats, preventing annoying creaks.
- Replacement cartridge bearings: Double-check your exact Hunt wheel model number to source sealed bearings (often standard sizes like 6802 or 6902, stamped with numbers on the rubber seal).
Step 1: Remove the Wheel and Freehub Body
Start by dropping the rear wheel out of your frame and pulling off any quick-release skewers or thru-axle adapters. For additional background on this development, detailed coverage can also be found on The New York Times.
- Pull the end caps: Most Hunt end caps are push-fit. Grip them firmly with gloved hands or protect them with soft-jaw pliers and pull straight out. Some models require two hex keys unscrewing in opposite directions.
- Slide off the freehub body: Pull the freehub body straight off the axle spline. Keep an eye out for thin axle shims, pawls, and tiny springs that might fly loose. Place these safely on a clean cloth.
- Extract axle seals: Remove any rubber lip seals or spacer washers sitting exposed on the freehub bearings to expose the inner races.
Step 2: Knock Out the Old Freehub Bearings
Hunt freehub bodies typically house two small cartridge bearings pressed internally against an internal spacer tube.
- Locate the internal spacer: Look inside the center of the freehub body. The inner spacer tube floats between the two bearings.
- Shift the spacer: Insert your brass punch or thin screwdriver through the top bearing and gently push the floating center spacer sideways just enough to expose a sliver of the inner race of the bottom bearing.
- Tap out the first bearing: Lightly tap around the exposed inner edge of the bottom bearing using your punch, working in a star pattern (top, bottom, left, right) so the bearing exits square. Once it clears the bore, the internal spacer will drop out.
- Remove the second bearing: Flip the freehub body over, drop your punch through from the newly opened side, and tap out the remaining top bearing using the same evenly distributed strikes.
Step 3: Clean and Inspect the Freehub Shell
With both old bearings removed, take a moment to examine the empty aluminum shell.
- Scour the bores: Spray isopropyl alcohol inside the bearing seats and wipe away old contaminated grease, metal dust, and grit.
- Check for damage: Inspect the press-fit surfaces for deep gouges or ovalization caused by a previously seized bearing spinning inside the soft alloy. If the seat is severely wallowed out, the freehub body may need replacement.
- Apply light grease: Smear a microscopic film of fresh waterproof grease inside the clean bearing bores. This prevents galvanic corrosion and makes the next replacement effortless.
Step 4: Press in the New Bearings
Pressing bearings in straight is the most critical step. Never hammer new cartridge bearings directly on their inner seals or inner races.
- Start the first bearing: Lay the freehub body flat on a stable workbench. Place the new bearing squarely over the bore. Use a flat drift that presses only against the outer metallic race of the bearing.
- Drive it home: Thread your bearing press rod through, secure the drift and backing plates, and slowly turn the handle. Check that the bearing enters the bore flat. Stop turning the moment you feel firm resistance, indicating the bearing has bottomed out against its internal shoulder.
- Re-insert the spacer: Drop the internal spacer tube back down through the center of the newly seated bearing.
- Press the second bearing: Place the final bearing over the opposite side, ensuring the internal spacer is centered so it doesn't trap crooked. Drive this second bearing in until it rests firmly against the internal spacer. Do not over-torque, or you will side-load the bearings and cause premature binding.
Step 5: Reassemble and Test
Clean any stray grease off the outside of the freehub body before putting your drivetrain back together.
- Reinstall pawls and springs: Clean the pawl pocket on the hub shell, apply a drop of light freehub oil (avoid thick grease here, which sticks pawls down), and pop the pawls back into place, securing them with their retaining spring ring.
- Slide the freehub on: Carefully slide the rebuilt freehub body back onto the axle splines, rotating it backward slightly to let the pawls click past the ratchet ring.
- Replace end caps and axle parts: Pop the end caps back onto the axle ends until they click securely.
- Spin test: Mount the wheel back into your bike frame. Spin the cranks and coast. The wheel should roll smoothly, and the cassette should spin silently without dragging the chain forward.
Consult official documentation from Hunt Bike Wheels for torque specs or replacement parts specific to your hub generation. For additional wheel care insights, check out resources on Park Tool.
Frequently Asked Questions
How often should I replace Hunt freehub bearings?
Lifespan varies wildly depending on riding conditions. Riders who commute year-round in rain and road salt might need new bearings every 3,000 to 5,000 miles, while fair-weather gravel and road riders often get double that mileage.
Can I just re-grease my old cartridge bearings instead of replacing them?
Yes, if caught early. You can use a sharp needle or hobby knife to carefully peel off the rubber seal, flush out old grit with degreaser, pack fresh grease inside, and snap the seal back down. If the bearing feels gritty, rough, or has side-to-side play, replacement is mandatory.
What happens if I ride on worn freehub bearings?
Worn bearings allow the freehub body to wobble under chain tension. This causes poor shifting performance, excessive wear on the internal ratchet ring, and eventual destruction of the aluminum hub shell itself.
Do I need a special bearing press, or can I use a mallet?
While you can tap bearings in using a suitably sized socket and a rubber mallet, it is very easy to cock them sideways and ruin the soft aluminum hub shell. A threaded bearing press guarantees parallel, controlled installation.
