What is Reddit's opinion of Bike U Lock 18mm Heavy Duty Bicycle U Locks with Shackle Anti-Theft Motorcycle Lock with Keys and Sturdy Mounting Bracket,Security for Road Bike,Scooter,Motorbike,Black?

From 3.5 billion Reddit comments

I would use two locks at least. A chain + a U-lock.

Cheap 18mm hardened steel U-lock for $25: https://www.amazon.com/AKM-Lock-Heavy-Mounting-Security-Motorcycle/dp/B07JLS89MY/

Those cheap locks can be cut in seconds.

Combination locks need to be avoided 100%

95% of combination locks can be fiddled with non-destructively as well, according to lockpickyinglawyer

Some can be fiddled with in seconds

16mm hardened U-lock at least along with 12mm hardened manganese steel chain at least

This cheap 18mm U-lock is actually hardened: https://www.amazon.com/AKM-Lock-Heavy-Mounting-Security-Motorcycle/dp/B07JLS89MY/

I would get this high quality 12mm german Schlage chain: https://www.amazon.com/dp/B00X6E0NO0/

And use this padlock with that chain: https://www.amazon.com/dp/B07RH7M8SW/

Zarker is a decent Korean padlock company. Not the best but good enough to deter junkies. Not good enough to deter expert thieves.