Hog Bikes

Best Motorcycle Disc Lock

The best motorcycle disc lock for most riders is the URBAN UR6. This motorcycle disc lock locks onto your front brake disc so the motorcycle can't roll, and a 120 dB alarm sounds if someone tries to move it. Its 6 mm pin fits most motorcycle brake discs, so it's an easy first lock for most bikes.

For more protection, the URBAN UR10 motorcycle disc lock is SRA approved and Sold Secure Gold tested.

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Quick picks

Check this before you buy: pin size

The pin on a disc lock goes through a hole in your brake rotor. A thicker pin is harder to cut, but it needs a bigger hole. Measure the holes in your rotor first. The Kryptonite's 5 mm pin fits small vent holes, the URBAN UR6 and KRASER WA6Y use 6 mm, and the RADIKAL RK14S uses a 14 mm pin that only fits large holes.

Our picks

Best overall

URBAN UR6 Alarm Disc Lock

Good for: everyday parking at work, the store or on the street.

  • 120 dB alarm with warning beeps first; use it with or without the alarm
  • 6 mm pin fits most motorcycle brake discs
  • Waterproof, replaceable alarm module
  • CR2 battery lasts 2 to 3 years, per the listing
Check it on Amazon

Best certified alarm lock

URBAN UR10 Alarm Disc Lock (10 mm)

Good for: riders who want an independently tested lock.

  • SRA approved and Sold Secure Gold tested, per the listing
  • 10 mm double-locking pin, stainless steel
  • Warns with 6 beeps, then sounds a 120 dB alarm
  • Waterproof, with a replaceable battery and alarm module
Check it on Amazon

Best maximum security

RADIKAL RK14S Alarm Disc Lock (14 mm)

Good for: bikes with large rotor holes that park in risky spots.

  • SRA approved and Sold Secure Powersport Gold, per the listing
  • 14 mm double-locking pin in hardened stainless steel
  • Anti-drill, anti-pick lock with 3 coded keys
  • 120 dB alarm you can switch on or off
Check it on Amazon

Best without an alarm

Kryptonite Keeper 5-S2 Disc Lock

Good for: a small, simple lock with no battery to think about.

  • 5 mm pin fits smaller vent holes
  • Compact, lightweight and weatherproof
  • Bright orange reminder cable included
  • Stapler-style lock stops roll-away and ride-away theft
Check it on Amazon

Best rechargeable

KRASER KR7Y USB Rechargeable Alarm Disc Lock

Good for: riders who'd rather charge than buy batteries.

  • Charges by USB in about 90 minutes; up to 2 months per charge, per the listing
  • 110 dB alarm with 3 warning beeps first
  • 7 mm pin
  • Push to lock, no key needed to lock it
Check it on Amazon

Best budget alarm lock

KRASER WA6Y Alarm Disc Lock

Good for: alarm protection at a low cost.

  • 110 dB alarm with motion sensor and 3 warning beeps
  • 6 mm pin, waterproof alarm
  • Comes with 3 keys, a reminder cable, a pouch and spare batteries
  • Push to lock
Check it on Amazon

What is the best motorcycle disc lock?

The URBAN UR6 is the best pick for most riders. It has a 120 dB alarm, a waterproof design and a 6 mm pin that fits most rotors. For more security, go with the URBAN UR10 or RADIKAL RK14S. For no alarm, the Kryptonite Keeper 5-S2.

Can thieves break a disc lock?

Any lock can be beaten with enough time and tools. A good disc lock makes it slow and loud, which is often enough to send a thief to an easier bike. Tested locks like the URBAN UR10 and RADIKAL RK14S hold up longer. For the best odds, add a GPS tracker so you can find the bike if it's taken.

Front or rear wheel: where should a disc lock go?

The front rotor is the usual spot because it's easy to reach and easy to see, which helps scare thieves off. Put it where you'll see the reminder cable before you ride.

How do I stop myself from riding off with the disc lock on?

Use a reminder cable. It runs from the lock to your handlebar or throttle so you can't miss it. The Kryptonite and the KRASER WA6Y come with one; for the others, buy one separately. Riding off with a lock on can damage the brake and the fork.

What is Sold Secure?

Sold Secure is a UK test lab that attacks locks with real tools and rates them by how long they hold out. SRA is a similar French approval. A lock with either rating has been tested by someone other than the maker, so look for them in the listing.

How we picked

We looked at what riders actually buy on Amazon, kept the products lots of riders already use and like, and favored known motorcycle brands. We read each maker's listing and pulled the key details you see on the cards. We haven't lab-tested these products, so we don't give scores. Details come from the product listings as of November 9, 2026, so check the listing for current sizes and fit before you buy.