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OnGuard Mastiff Chain and Disc Lock

Sale $24.95 $39.95 38% off

Item # ONG000S

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  • Black, 8mm ($24.95)
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Item # ONG000S

Chain up.

We can't all have a massive dog hovering near our bicycle to intimidate potential thieves, but we can lock up our whip with the OnGuard Mastiff Chain and Disc Lock. Featuring cut- and saw-resistant square links made from titanium reinforced hardened steel and a Mastiff rotary lock with a deadbolt mechanism, this lock works hard to keep your bike in place. It comes packaged with five heavy-duty, F-style keys and includes a nylon chain cover with hook-and-loop tabs.

Tech Specs

Titanium reinforced hardened steel
Lock Type:
2.59 ft
Recommended Use:
Manufacturer Warranty:

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So far so good...

    The mastiff lock is a triple threat;. it has weight, it has girth and it has a mess-proof lock. You can't destroy this thing. It's awesome. I feel very secure using this lock to protect my bike.

    Avg. ride time: 2h 17m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    OnGuard Mastiff Chain & Disc Lock

    • Familiarity: I've put it through the wringer

    I really like this lock more and more I use it. Much easier to carry around than a medium ulock. I like to wrap it around my handle bar while commuting. Good length to tie up and comes with plenty of extra keys. Every once in awhile the shank has trouble getting hung up on the edge of the pad lock housing when relocking but overall its my go to when out around town for errands.