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Disc Covers
Your brake rotors are precision-machined components that live in the most exposed position on your dirt bike. Rocks, roots, and crash debris can score, dent, or even crack a rotor during hard off-road riding — and a damaged rotor won't just hurt your stopping power, it can damage your brake pads and caliper as well. Disc covers provide a durable shield that absorbs the impacts your rotor doesn't have to.
Our disc cover selection includes front and rear options from quality brands like Acerbis, engineered from impact-resistant polypropylene with specific cutouts that maintain adequate airflow for cooling while blocking debris effectively. Many covers feature integrated guards that protect the rotor from direct lateral impacts during low-speed falls and rock strikes. Available for most popular dirt bike platforms in both OEM and universal sizing.
Find the right disc cover for your dirt bike's make and model in our selection below.
Frequently Asked Questions
What is a dirt bike rear disc cover and why do I need one for off-road riding?
A rear disc cover is a protective plastic guard that shields your brake rotor from rocks, mud, and debris that can cause warping or premature pad wear. High-quality options like the Acerbis Rear Disc Cover - Full provide comprehensive coverage to prevent impact damage during aggressive trail or track riding.
Will Acerbis disc covers fit my specific KTM or Honda motocross bike?
Acerbis designs model-specific disc covers for major manufacturers including KTM, Honda, Yamaha, Kawasaki, and Husqvarna to ensure a perfect bolt-on fit. Most front and rear guards require a model-specific mounting kit or axle spacer, so always verify your bike's year and displacement before purchasing.
What is the difference between a front brake disc guard and a full rear disc protector?
A front disc guard typically covers the leading edge of the rotor to deflect roost, while a full rear disc cover often replaces the axle spacer to provide rigid protection for the entire braking surface. Brands like Acerbis use durable polypropylene that flexes under impact rather than shattering, keeping your braking system functional in rocky terrain.
Do aftermarket disc covers work with oversized brake rotors?
Standard disc covers are engineered for OEM rotor sizes, typically ranging from 220mm to 270mm depending on the bike model. If you have installed an oversized brake kit, you must check the maximum diameter clearance specifications provided by Acerbis or the manufacturer to ensure the plastic does not rub against the rotor.
How do I choose the right mounting hardware for a plastic disc cover?
When buying a disc cover, check if the mounting bracket is included or if it must be purchased separately as a bike-specific part. For the best results, match your Acerbis Disc Cover with the corresponding aluminum mounting kit to ensure the guard stays centered and does not vibrate loose during high-speed operation.