By: Master Lock
Secure your bike with the Master Lock 8170D U-Lock Bike Lock! This heavy-duty lock is made with a 6-1/8 inch wide black steel body and a reinforced cuff over the crossbar and cylinder for extra protection. It features a disc-style cylinder that is pick and drill resistant for maximum security. With its easy-to-lock design, superior build quality, and long-lasting durability, it is no wonder the 8170D U-Lock is one of the best bike locks on the market. Get yours today and rest easy knowing your bike is safe!
E.C. :
Heavyweight, looks just like photo, big/normal size, not cuttable. Could be used as a weapon, it’s so heavy lol Might rust if left in weather but it’s easy to use and the mount screws are very tiny. Make sure not to drop them, I’ve already lost a couple parts but I had enough to secure it, luckily. Be gentle with the keys, they could get worn if used while angry 😂😂You also have to use the key to lock it. Masterlock is a longtime trusted company and I’m very happy with my purchase. 10/10 would recommend.
United States on Nov 10, 2023
Diane:
Works well for locking up the door of my catio. Keeps both cat and me safe ! It is big enough to go around door post and side post to keep everything secure. So far no complaints, easy to put on and take off.
United States on Oct 20, 2023
ReneeRenee:
Seems like a solid lock and is heavier than I expected. Also appreciate that it comes with two keys which wasn’t obvious from the photos. I’m satisfied it will hold up a lot better than a wire lock.
Canada on Sep 17, 2023
pinecone29:
I use this for locking up my bike at work. The lock and key mechanism works great and it functions as it is supposed to. I can't comment on the bracket that attaches to the bike frame as I just put it in my backpack and take it out when I need it a I don't want to attach it to my frame. It would likely need a hack saw or rotary tool in order to break it or if someone is good with picking the lock. I can't see it being opened using bolt cutters as it is likely too thick. If you are super concerned and leave your bike for extended hours, you may want to pay the big bucks for something that has a proper lock security rating, but for me, this works great.
Canada on Sep 06, 2023
Emperor Ed:
Can't turn key to unlock.
United States on Aug 26, 2023
Ian:
In a world of burgeoning e-bike thefts, the Master Lock 7.25" U Lock offers an affordable solution to deter opportunistic thieves. For its price, it serves its purpose well, acting as a visual deterrent for anyone hunting for an easy steal. Its affordability, therefore, shouldn't be dismissed outright.
However, its performance against more determined or skilled thieves is a different story. The lock is unfortunately susceptible to picking and cutting. This vulnerability raises some concerns about its effectiveness as a standalone security device for your e-bike, especially in high-theft areas.
That said, when used in conjunction with a sturdier lock, such as the Kryptonite Evolution 1090, it plays a role as an excellent secondary security measure. This combination has proven successful in my case, having effectively safeguarded my e-bikes in an area known for frequent thefts.
In conclusion, the Master Lock 7.25" U Lock is a budget-friendly choice for those looking for an additional layer of security. Its strength may not lie in its ability to withstand dedicated burglary attempts, but as a secondary lock that enhances the overall security of...
United States on Jul 06, 2023
The amazon shopper:
Great for locking cheaper bikes, if you got an expensive scooter or e bike, buy a bigger lock because this one is very thin and you will need to find a bike rack to lock because a tree will be too thick. Overall not bad at all and cones with mount and two keys
Canada on Mar 14, 2023
Kenneth R Franklin:
Good overall quality and good fit. I had to buy longer bolts to attach as my bike frame is thicker than most
Canada on Oct 22, 2021
Fernando Arreola:
Practico y economico, funcional y seguro
Mexico on Sep 05, 2020
| Secure Your Bicycle with the Master Lock 8170D U-Lock Keyed Bike Lock | SIGTUNA Bike Lock: 16mm Heavy-Duty U-Lock for Superior Security | SIGTUNA 16mm Heavy-Duty U-Lock Bicycle Security Lock | |
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| B2B Rating |
80
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97
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97
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| Sale off | $13 OFF | ||
| Total Reviews | 90 reviews | 779 reviews | 638 reviews |
| Special Feature | Heavy Duty | Anti-theft, Heavy Duty | Anti-theft, Heavy Duty |
| Item Dimensions LxWxH | 9.8 x 7.33 x 1.33 inches | 2.44 x 7.8 x 10.67 inches | 9.45 x 6.97 x 1.89 inches |
| Lock Type | Key Lock | Key Lock | Key Lock |
| Material | Steel, Rubber | Steel | Steel |
| Brand | Master Lock | SIGTUNA | SIGTUNA |
United States on Dec 28, 2023