Onguard 8003 Pitbull
This is not the safest option on the list. Furthermore, it is neither the cheapest nor the most costly. But trust us when we say that the Onguard 8003 Pitbull is the kind of lock that you can feel confident using day in and day out.
A 14mm solid steel shackle is sufficiently thick to render bolt cutters ineffectual; even better, it latches on both sides, requiring at least two slashes to dislodge it. It will eventually succumb to an angle grinder, but not without producing a great deal of noise in the process. Hence, you will never have to be scared of your bike being stolen.
In addition, this Onguard 8003 Pitbull provides at least five keys, so you never need to worry about losing one of them. Also, the lights on each key are a great feature, given this price point. The most popular option is the standard form, which has adequate space inside for the frames and wheel.
Ratings: 4.5 stars (from 376 reviews)
Price: $42.19
Buy it at: https://www.amazon.com/dp/B008MZ0A3M