When it comes to bike locks, you get what you pay for. Spend a few hundred pounds on a bike and then lock it up in the street with something that cost a tenner down the market and you could end up taking the bus home. Do yourself a favour and invest in some proper security.
When you're choosing what's best for you, look out for Sold Secure ratings. These are independently assessed awards given to security products and they come in bronze, silver and gold flavours reflecting the level of protection on offer.
OnGuard Bulldog Mini
This lock is just 150mm long, 90mm wide and 862g so it's ideal for slinging into your bag or leaving on the mounting bracket just in case you need it. The shackle is 13mm-wide hardened steel and its small size means it's hard for a thief to get something in there to prise it open. The cylinder will put up stubborn resistance to both strong-arm tactics and picking while all the parts are rubber coated to prevent any damage to your bike.
Abus Bordo Granit XPlus
This concertina-style lock is super-compact when folded up (190 x 65 x 35mm) so it's convenient to carry, the rubber pouch attaching to your bike frame in seconds with Velcro straps. The 5.5mm-thick hardened steel links provide Abus's top level of security while the lock mechanism is well shielded from attack. At 85cm long when opened out, it can fasten your bike to all kinds of solid objects, and one of the keys even has its own little LED to help you find the keyhole in the dark - neat touch!
Abus Granit X-Plus 54
A top-level Sold Secure Gold rating shows that this is a great choice if you need to leave your bike in a high-risk area - this is about as tough as a portable lock gets. It's built with a strong, double-bolted shackle and a well-protected mechanism while a universal mount makes it easy to carry around.
Kryptonite Evolution Mini
Kryptonite make some fantastically strong locks and this little number (140 x 83 x 13mm) packs a big punch for a little un, earning a Sold Secure Silver rating. The hardened steel shackle bolts into a reinforced crossbar with impressive resistance to twisting and leverage. It's also available in a longer (241mm) version.
Master Lock Street Fortum
With a Sold Secure Gold rating, this D-lock offers superb value for money. It's well constructed with a shackle that goes right through the locking bar to anchor everything firmly in place. You get four keys and a frame mount while the rubber finish prevents any damage to your bike frame.
Squire Urban Protector
With a Sold Secure Silver rating, the Urban Protector offers excellent protection for the cash. A hardened boron alloy steel shackle, a hardened steel body, and a double locking mechanism will fend off all but the best-equipped thieves with plenty of time on their hands. The shackle is a generous 29cm long so you get loads of space for locking your bike to street furniture, and the plastic carrying bracket holds it firmly on your frame while you're riding.
Master Lock Street Cuff
These are handcuffs for your bike. You attach one cuff around your frame and the other around something immovable, like a bike rack. They're made from laminated hardened steel, and because they're just 7.5cm in diameter it's difficulty for a crook to get a lever inside. The link between them is hardened too and it pivots, further thwarting any would-be tealeaf. The Street Cuffs fold in half for easy carrying, or you can buy an extra bracket (£9.99) for stowing them neatly on your bike.
Trelock FS 455
This lock comes with a Sold Secure Silver rating and the 85cm length means you can protect your wheels as well as the frame. It folds down to a diddy 190 x 84 x 35mm, and it sits securely in a plastic mount on your frame when not in use.
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