How to replace a worn pedal bearing set on clipless pedals

Clipless pedals take a real beating, especially if you ride through the dusty trails around the Yarra Valley or commute daily across inner Sydney. The sealed bearing sets tucked inside each pedal body are designed to handle load and rotation, but grit, sweat, and our harsh UV all conspire to shorten their life. When the bearings fail, you usually feel it before you see it: a gritty resistance, a click with every pedal stroke, or a vague side-to-side wobble under hard efforts.

Replacing the bearing set is one of those jobs that looks fiddly on the bench but pays off massively once you've done it. A fresh pair of bearings can make an old pair of pedals feel brand new, and you'll save a tidy amount compared to buying replacements. This walkthrough goes through the full job, from initial diagnosis to the post-service test ride, with the kind of detail you'd expect from a workshop that sees these pedals come through every week.

Before diving in, it's worth noting that clipless systems share design DNA with the cassette on the back of your bike. If you've already tackled a similar job on the rear wheel, the how-to-replace-a-worn-cassette-tool-and-lockring-for-a-perfect-fit guide covers the comparable principles of removing a worn component with the right tool and technique.

Diagnosing bearing wear in clipless pedals

The classic symptom of tired pedal bearings is rotational drag that doesn't go away even after you've cleaned the cleat interface. Spin the pedal by hand with the bike in a workstand, and feel for roughness or a pulsing resistance as the axle turns. New pedals will spin for many revolutions with almost no friction; worn ones tend to grind to a halt within a turn or two, even on premium gear that's only done a couple of thousand kays.

Side-load play is another tell. Grip the pedal body and rock it against the axle. Any clunk or perceptible slack usually means the bearing preload has loosened or the balls themselves have developed flat spots. In Australia's dry interior rides, where fine red dust works its way into everything, this kind of wear can show up surprisingly early, sometimes within a season of regular use.

Don't confuse bearing failure with bushing wear. Some lower-end pedals use nylon or bronze bushings rather than sealed bearings, and these can feel similar but require a different rebuild approach. Check the manufacturer's spec sheet before ordering parts, because the rebuild procedure for a bushing pedal is fundamentally different and the wrong grease will turn them to mush in weeks.

Tools and workspace setup

A clean, flat work surface is essential, since the bearings and circlips involved are small and easy to lose. A magnetic parts tray is a worthwhile addition to any home workshop and saves fishing around the concrete for a 3mm circlip at 9pm on a Sunday, which is the worst possible time for that kind of disaster.

You'll need the following essentials, plus a few optional extras for trickier rebuilds:

A torque wrench capable of low settings (around 5–20 Nm) is also handy for the reassembly step, particularly on carbon-bodied pedals where overtightening the end cap can crack the body.

Removing the pedal body and old bearings

Start by removing the pedal from the crank. Remember that the drive-side pedal threads on in reverse, so it loosens the "normal" way from the front of the bike, while the non-drive side loosens from behind. Mount the axle in the vice with soft jaws to protect the threads, and don't over-crank the vice or you'll mushroom the end of the axle.

With the axle secured, take off any dust cap or end cover. On many designs, this is a plastic snap-fit cover, but some use a small bolt or a threaded ring. Work carefully here, because older plastic covers can become brittle after years of UV exposure on the bike rack at a café in Fitzroy or sitting out the back of a share house in Brunswick.

Once the cover is off, you'll see the bearing preload arrangement. It's usually a wave washer, a shim, or a threaded cone. Remove these in order and keep them on the bench in the same sequence for reassembly. Then drive out the old bearings using a suitably sized socket or bearing drift, working from the outside in so you don't distort the bearing seat. A light tap is all you need; if the bearings really won't budge, the corrosion is telling you something.

Cleaning and inspecting the pedal axle

With the bearings out, give every component a thorough clean. Degreaser on the bearing seats, axle, and end caps removes the contaminated grease that caused most of the wear in the first place. Pay attention to any pitting or corrosion on the axle surface where the inner race sits; even a small divot will telegraph through the new bearings and shorten their life considerably.

Inspect the bearing seats inside the pedal body for cracks or stretched bores. If the aluminium has worn oval from a long-running rough bearing, a new bearing won't sit properly and you'll feel play again within weeks. Most modern pedal bodies are robust, but it's a worthwhile check, particularly on older designs that have done thousands of kilometres along the Brisbane Valley Rail Trail or similar rough surfaces.

The axle threads deserve attention too. Clean them with a brush, chase them with a die if you have one, and apply a thin layer of anti-seize before reinstalling. Australian stainless steel pedals can still gall when mated to a crank, and a seized pedal axle is a miserable thing to deal with later, especially if you have to remove the crank itself just to free it.

Choosing and installing the new pedal bearing set

Match the replacement bearings to the pedal model exactly. While standard 6001 and 6901 sized bearings are common, some pedals use proprietary sizes or sealed contact angles, and substituting the wrong type will either bind or wobble. A quick reference for common pedal bearing specs:

Pedal brand/model Bearing size (ID × OD × W mm) Type Notes
Shimano SPD (M520/M540) 8 × 22 × 7 608 sealed Standard, easy to source
Shimano SPD-SL (R540/R670) 8 × 22 × 7 608 sealed Same as MTB SPD
Look Keo Classic 9 × 17 × 5 689 sealed Check spec carefully
Crankbrothers Eggbeater 8 × 19 × 6 Miniature sealed Often unique to model
Time ATAC 8 × 22 × 7 608 sealed Shares with Shimano

Always confirm with the manufacturer's exploded diagram before ordering. Some premium options from suppliers like premium cycling retailers carry specialised bearing kits that include the correct spacers and seals, which simplifies the job considerably and saves a separate parts order.

Press the new bearings in using a socket that contacts the outer race only. Even pressure is critical, since an angled install will preload the bearing and shorten its life. A small bench press or a careful tap with a soft mallet works fine for most home setups. Pack each bearing generously with grease once seated, working the grease through the seal until you can see it come through the opposite side, which confirms the bearing is fully packed.

Reassembly, torque settings, and final checks

Reassembly is essentially the reverse of disassembly, but with attention to preload. The wave washer or shim stack determines bearing preload, and getting it right is the difference between a pedal that spins freely and one that binds. If your pedal uses a threaded cone, tighten it until you can just feel resistance, then back off until the pedal spins freely with no play.

Grease choice matters. Marine-grade or high-pressure greases tend to last longer in our climate, especially if you ride in the humid coastal air around Cairns or in salt-spray zones near the Mornington Peninsula. Standard bicycle grease works fine for most inland riders, but it tends to wash out faster when the weather turns wet. A final check before the pedals go back on the bike should cover these points:

Reinstall the pedal on the crank with fresh anti-seize on the threads, and torque to manufacturer spec. For most Shimano and Look pedals this is around 35–40 Nm; Crankbrothers usually call for slightly less, around 30 Nm.

Testing the service and knowing when to replace

Take the freshly serviced pedals for a short test ride before committing to a long loop. A quick spin around the block is enough to confirm the bearings are seated properly and the preload feels right. If you feel any roughness or binding under load, stop and recheck the installation, because forcing through it will only damage the new bearings before they've had a chance to bed in.

Bearings don't last forever, even with regular service. A pedal that has done five or six bearing replacements is usually showing wear in the axle itself, and a fresh axle or new pedal body becomes more cost-effective than another service. Keep an eye out for fretting corrosion at the axle-to-body interface, which usually means the pedal is approaching end of life and is worth replacing before it leaves you stranded mid-ride.

For riders clocking up big kilometres on the Mawson Trail or commuting through Perth's summer heat, expect to service the pedal bearings every 12 to 18 months. Cooler, drier conditions and regular cleaning can stretch that out, but the combination of load, rotation, and exposure will eventually win. A well-executed bearing replacement is one of the more satisfying workshop jobs, and the next arvo ride will feel noticeably smoother for the effort.