How to Fit Mudguards on E-Bikes Properly

A wet road can turn a clean e-bike into a rolling spray gun in minutes. If you want to fit mudguards on ebikes properly, the key is not simply finding a set that matches the wheel diameter. You need enough tyre clearance, secure mounting points and hardware that will not work loose under the extra speed, weight and vibration of an electric bike.

For urban e-bikes, full-length mudguards are one of the most useful upgrades you can make. On e-MTB and gravel e-bikes, compact guards may be the better answer where tyre clearance and suspension travel limit your options. The right setup keeps water off your back, drivetrain and motor area without causing rubbing, rattling or wheel damage.

Choose mudguards for your e-bike, not just its wheels

Wheel size is the starting point, but it is not the whole specification. A 700c urban e-bike and a 29-inch e-MTB both use a similar rim diameter, yet their tyres, frame profiles and available clearance can be completely different. Check the size marked on the tyre sidewall, such as 700 x 45c, 29 x 2.35 or 27.5 x 2.6, then compare it with the mudguard manufacturer’s recommended width.

As a rule, choose a mudguard that is noticeably wider than the inflated tyre. A 45 mm guard can work well over a 35 mm commuter tyre, while a 60 mm guard suits many 45 to 50 mm trekking tyres. For wide MTB tyres, full guards can become impractical, especially with aggressive tread. A close-fitting guard may clog with mud long before the trail becomes difficult.

E-bike frame geometry also matters. Integrated batteries often create chunky downtubes, rear racks can occupy the same space as mudguard stays, and some hub-motor bikes use axle fittings that differ from a standard quick-release wheel. Before ordering, inspect the fork crown, bridge between the seatstays, dropouts and rear axle area for threaded eyelets or dedicated mounting points.

Full-length, clip-on or MTB guards?

Full-length mudguards with stays are the best choice for commuting, touring and everyday riding. They offer the most coverage, protect the rider behind you and keep road grime away from the chain, cassette and lower bearing areas. They are especially worthwhile on a fast urban e-bike used through winter.

Clip-on mudguards are quicker to remove and suit bikes with limited mounts. They work well for occasional wet rides, but they do not offer the same protection as a properly fitted full set. A rear clip-on guard can also move under rough riding, so it is better suited to light gravel or commuting than repeated technical descents.

For e-MTB, short fork-mounted front guards and compact rear guards are usually the practical option. They keep spray out of your face and off the shock area without reducing clearance around a 2.4 or 2.6-inch tyre. They are not designed to keep your trousers dry on the ride home, but they cope better with mud and suspension movement.

Check clearance before you fit mudguards on e-bikes

Clearance is the detail that separates a quiet, reliable installation from a guard that rubs at every pedal stroke. Measure the space between the tyre and the fork crown, seatstay bridge and frame tubes. You need room not only for the mudguard itself, but also for tyre flex, small stones and accumulated mud.

On road and commuter e-bikes, aim for a visible gap around the tyre rather than fitting the guard as close as possible. If your tyre picks up grit, leaves or wet road debris, a tight guard can jam. On an e-bike, that is more than an annoyance: the motor can continue applying force while the wheel is obstructed.

Do not assume the clearance is the same all the way around the wheel. Many frames are tighter at the chainstays, fork brace or seatstay bridge. Rotate each wheel slowly and inspect the gap from every angle. If the wheel is slightly out of true or the tyre is not seated evenly, correct that before setting the mudguard position.

Full-suspension e-MTBs require an additional check. Deflate the rear shock or compress the suspension carefully to confirm that the tyre will not contact the mudguard, frame or mounting hardware at full travel. Never fit a conventional rear full-length guard to a suspension bike unless the manufacturer specifically provides a compatible mounting solution.

Tools and hardware for a secure installation

Most mudguard kits include stays, bolts and small brackets, but it is worth checking their compatibility before starting. You will normally need Allen keys, a small spanner, side cutters for trimming stays, a tape measure and a little thread-locking compound suitable for bicycle fasteners.

If your frame has no eyelets, use purpose-designed P-clips, axle mounts or bridge clamps supplied for that application. Avoid improvised hose clips, cable ties as primary mounts or drilling holes in the frame or fork. Drilling can weaken the component, void a warranty and create a serious safety issue, particularly on carbon forks and e-bike frames with internal cabling or battery mounts.

Stainless-steel hardware is preferable for a bike used in wet conditions. Where a bolt threads into an aluminium frame eyelet, apply a small amount of suitable grease or assembly compound to help prevent corrosion and seizing. Use thread-locker only where the component manufacturer recommends it, and do not overtighten small bolts into lightweight alloy eyelets.

Fitting the front mudguard

Start with the front wheel because fork and crown clearance usually determine whether the set will work. Position the guard centrally beneath the fork crown, then loosely install the crown bracket. On many bikes this uses the brake bolt, a dedicated threaded mount or a supplied adaptor. Make sure the bracket does not interfere with brake hoses, front lights or cables routed around the headset.

Attach the stays at the fork eyelets or axle mounts, keeping all bolts loose enough for adjustment. Centre the mudguard over the tyre, then set the height so it follows the wheel’s curve without sitting too close to the tread. The front section should extend low enough to limit spray, while the rear section should clear the downtube and any motor cable routing.

Once centred, tighten the crown mount first and then the stay fixings. Trim excess stay length only after checking steering from lock to lock. The cut ends should be capped if the kit includes protective caps. A sharp exposed stay is a hazard to legs, luggage and nearby cables.

Fitting the rear mudguard

At the rear, attach the bridge bracket beneath the seatstay bridge or to the dedicated mounting point. On some step-through and rack-equipped e-bikes, the rear guard may share space with a carrier mount. Fit the carrier according to its instructions first, then assess whether the mudguard bracket sits cleanly beneath it.

Secure the stays to the rear dropout eyelets and align the guard along the centreline of the tyre. Check the gap around the chain, derailleur, cassette and brake caliper. On hub-drive e-bikes, be particularly careful not to trap or bend the motor cable at the axle. The cable needs a natural route with enough slack for wheel removal.

If your kit includes a mudflap, fit it. A flexible flap makes a real difference on wet roads, reducing the spray thrown forwards by the front wheel and backwards by the rear wheel. It is a small addition that protects shoes, panniers and riders behind you.

Test the installation before your first wet ride

Spin both wheels and listen. Any ticking usually means the tyre is touching the guard, a stay is contacting a spoke or a cable is brushing the wheel. Correct this while the bike is in the stand rather than waiting for the noise to become worse on the road.

Then check every bolt, compress the suspension where relevant and turn the handlebars fully both ways. Take a short ride over rough ground and recheck the mounts afterwards. Mudguards settle slightly after their first ride, particularly stays and brackets on bikes with wide tyres.

Reinspect the setup after a few rides and whenever you remove a wheel for a puncture repair, tyre change or brake service. A guard that is perfectly aligned before wheel removal can sit off-centre once the wheel is refitted.

A well-fitted mudguard set is not glamorous, but it makes an e-bike far more usable when the weather turns. Choose the width and mounts carefully, leave realistic clearance and take the extra few minutes to align the stays. Your clothes, drivetrain and fellow riders will notice the difference.