OnGuard's PitBull LS is a sturdy U-lock that defends your bicycle with 1/2-inch hardened steel and OnGuard's X4 quattro-bolt lock. And thanks to the included mounting bracket the PitBull will be along for every ride. This lock also comes with five keys, including OnGuard's Microlight key which has a built-in light.

The Bouncer from Knog makes sure it's only you riding away on your bike. A hardened steel shackle is nearly impossible to cut, grind, or freeze and its lock cylinder provides the ultimate in security. The silicone body is soft enough to protect your bike's paint job and holds up in the sun thanks to the UV resistant qualities.

The ABUS Catena Combo Chain lock features a strong, 7mm square chain with a durable fabric cover that protects your bicycle's finish. And, you can set your own combination on the easy-to-spin digit wheels, too.

• Four-sided trapezoidal chain links • Weather proof nylon cover • Heat treated links • Heat treated high security mini U-lock w/2 keys • 10mm chain • Length: 4 feet

Folds like origami but solid like Fort Knox. The compact package folds up easily and can be put in your back pocket or mounted to your frame using the included water bottle mount. We use hardened pins and 5mm thick steel links. Seamlessly wraps around your frame and secure your ride to anything from a bike rack to lamp post. Product Features: - Security level 7 - Security of a U-lock but will fit in the palm of your hand - Bottle cage mount included - 3 keys included - Weight: 1lb 6 oz

- The ideal solution to bicycle wheel theft - Includes a front and rear wheel locking skewer, with each lock operated using a unique multi combination key, to ensure the security of your wheels at a fraction of their replacement cost

- Titanium-reinforced hardened square link chain mated to an integrated X2P Dual Lock Down head - Featuring new double rubber cover for better protection against bumps and hits.

OnGuard's Mastiff Chain delivers major protection for your bike in high-risk areas. Its titanium-reinforced, 10mm hexagonal links resist attacks from saws and cutters, while the burly lock resists picking, pulling, and bumping and locks on all four sides of the shackle, maximizing resistance to pulling attacks. This lock comes with five keys, including one with a built-in light.

OnGuard's PitBull DT is a sturdy U-lock/cable combination that protects your bicycle with 1/2-inch hardened steel, OnGuard's X4 quattro-bolt lock, and a 3/8-inch-diameter cable. This cable is 4-feet long so that you can lock up your wheels, or another bike, with ease. And thanks to the included mounting bracket the PitBull DT will be along for every ride. This lock also comes with five keys, including OnGuard's Microlight key which has a built-in light.

OnGuard's PitBull STD is a sturdy U-lock that defends your bicycle with 1/2-inch hardened steel and OnGuard's X4 quattro-bolt lock. And thanks to the included mounting bracket the PitBull will be along for every ride. This lock also comes with five keys plus OnGuard's Microlight key, which has a built-in light.

OTTOLOCK is designed for quick stops and protecting against opportunity theft. Starting weight at just 145g and coiling to a compact 3-inch diameter, OTTOLOCK is truly portable and always there when you need it. OTTOLOCK is not a replacement for a U-Lock. For maximum security, use a redundant locking method with both a U-Lock and a secondary lock. See Use Guidelines. - Lightweight: Weighs only 145g - 260g and is easily stowed. So light and portable you won’t even know you are carrying it. - Compact: Coils to a 3-inch diameter. Keep it in or around your saddle bag, backpack, in your pocket, or anywhere you want. - Durable: Chip-resistant Cerakote paint and Santoprene plastic that will not scuff or harm finishes. - Convenient: Keyless resettable combination. - Weight: 18" = 145g / 30" = 175g / 60" = 260g

- 9.5mm four-sided chain links made of 3t manganese steel - Protective nylon webbing with hook-n-loop fasteners to hold cover in place and prevent scratches to bike frame - Adjustable rubber end-caps keep webbing ends protected while allowing the user to change the webbing length up or down as desired - Hardened Steel bodied Padlock with 2" x 11mm hardened steel shackle - Retained shackle side allows chain to be carried around waist - Hardened double deadbolt provides additional holding power against twist attacks - High security Pin-style cylinder - 2 ergonomic keys with coiled wrist key chains - Key Safe Program

Kryptonite's Evolution Series 4 1055 Mini Integrated Chain is a 10mm-thick, six-sided link chain made of triple-heat-treated, boron-manganese steel for maximum strength. At 21.5 inches long, the Evolution gives your bike security in a pint-size package. The links are covered with a weather-resistant nylon sleeve that protects your bike's finish, and it uses an integrated high-security cylinder that is pick, drill, and cut resistant. Three keys are included, including one that has a high-intensity LED bulb for convenient, easy unlocking in the dark. This chain has an anti-theft protection offer.

Kryptonite's Evolution Series 4 1090 Integrated Chain is a 10mm-thick, six-sided link chain made of triple-heat-treated manganese steel for maximum strength. At 35.5-inches long, the Evolution gives you biking security in an easy-to-carry package. The links are covered with a weather-resistant nylon sleeve that protects your bike's finish, and it uses an integrated high-security cylinder that is pick, drill, and cut resistant. Three keys are included, including one that has a high-intensity LED bulb for convenient, easy unlocking in the dark. This chain has an anti-theft protection offer.

- 14mm hardened MAX-Performance steel shackle resists both cutters and leverage attacks - Double deadbolt locking mechanism has extensive holding power - High security, disc-style cylinder with reinforced anti-drill, anti-pull protection system - Sliding dust cover protects and extends cylinder life - 3 stainless steel keys—one lighted with high-intensity bulb & replaceable battery - Key Safe Program - Product dimensions: 1.8” x 2.1” (48mm x 54mm) - Product weight: 1.85 lbs (0.84 kgs)

- 3mm hardened steel links for moderate security lockups - Includes easy-to-install transport bracket - Includes 2 keys - Key Safe Program - Product dimensions: Length 100cm - Product weight: 1.90 lbs

- 3mm hardened steel links for moderate security lockups - Includes easy-to-install transport bracket - Includes 2 keys - Key Safe Program - Product dimensions: Length 85cm - Product weight: 1.70 lbs

- End link locking point for extensive holding power - 4-sided 3t manganese steel chain links - 4 digit resettable combination over 10,000 codes - Patent pending lock head design - Combo Safe Program - Product dimensions: Length 120cm - Product weight: 4.50 lbs

- 7mm four-sided chain links made from 3t manganese steel - Patent-pending end link design secures chain to hardened deadbolt eliminating critical vulnerability - Hardened deadbolt design provides extra holding power - High security disc-style cylinder is pick and drill resistant - Includes 2 new ergonomic “I” keys - Durable weather-resistant nylon sleeve prevents scratches - Key Safe Program - Product dimensions: 47.3” (120cm) chain length - Product weight: 3.75 lbs (1.70 kgs)

- End link locking point for extensive holding power - 4-sided 3t manganese steel chain links - 4 digit resettable combination over 10,000 codes - Patent pending lock head design - Combo Safe Program - Product dimensions: Length 90cm - Product weight: 3.75 lbs

- 3mm hardened steel links for moderate security lockups - Includes easy to install transport bracket for hassle free transportation - Easy to use dials with highly visible digits that provide a high level of ergonomics - Compact and easy transport - Product dimensions: Length 85cm - Product weight: 2.18 lbs

- 5mm hardened steel links for moderate security lockups - Includes easy-to-install transport bracket - Includes 2 keys - Key Safe Program - Product dimensions: Length 85cm - Product weight: 2.35 lbs

- End link locking point for extensive holding power - 4-sided 3t manganese steel chain links - 5 digit resettable combination over 100,000 codes - Patent pending lock head design - Combo Safe Program - Product dimensions: Length 120cm - Product weight: 7.35 lbs

- End link locking point for extensive holding power - 4-sided 3t manganese steel chain links - 5 digit resettable combination over 100,000 codes - Patent pending lock head design - Combo Safe Program - Product dimensions: Length 90cm - Product weight: 5.85 lbs

The KryptoLok Combo U-lock is like a tough nut: you just can't crack it. Thanks to the 13mm hardened Performance steel shackle that resists cutting and leverage attacks, you get peace of mind while you run into the grocery store or lock up outside the coffee shop. A built-in four-digit resettable combination gives you easy unlocking and locking capabilities--no keys necessary! You can also take advantage of the Transit Flex Frame bracket for plenty of convenient mounting options. The KryptoLok Combo is 4 x 8-inches and has an anti-theft protection offer.

- 9mm four-sided chain links made from 3t manganese steel - Patent-pending end link design secures chain to hardened deadbolt eliminating critical vulnerability - Hardened deadbolt design provides additional protection - High security disc-style cylinder is pick and drill resistant - Patent pending integrated lock head with “talon” deadbolt - Includes 2 new ergonomic “I” keys - Durable weather-resistant nylon sleeve prevents scratches - Key Safe Program - Product dimensions: 47.25” (120cm) chain length - Product weight: 6.7 lbs (3.04 kgs)

Kryptonite's KryptoLok Series 2 915 Integrated Chain is a 9mm-thick, four-sided link chain made of triple-heat-treated, boron-manganese steel for serious strength. Its integrated high-security lock cylinder is pick, drill, and cut resistant. This five-foot chain is covered with a weather-resistant nylon sleeve that protects your bike's finish. Plus, the KryptoLok Series 2 has an anti-theft protection offer.

Kryptonite's KryptoLok Series 2 955 Mini Integrated Chain is a 9mm-thick, four-sided link chain made of triple-heat-treated manganese steel for serious strength. Its integrated high-security lock cylinder is pick, drill, and cut resistant. This 21.5-inch chain is covered with a weather-resistant nylon sleeve that protects your bike's finish. Plus, the KryptoLok Series 2 has an anti-theft protection offer.

Kryptonite's KryptoLok Series 2 995 Integrated Chain is a 9mm-thick, four-sided link chain made of triple-heat-treated manganese steel for serious strength. Its integrated high-security lock cylinder is pick, drill, and cut resistant. This 37.5-inch chain is covered with a weather-resistant nylon sleeve that protects your bike's finish. Plus, the KryptoLok Series 2 has an anti-theft protection offer.

The KryptoFlex 1030 Looped Cable is a 10mm braided steel cable providing increased cut resistance. The double loops are for use with U-locks, disc locks and padlocks (sold separately). The vinyl coating protects bikes and equipment from scratches and it includes a Hook-n-Loop strap for easy carrying. The KryptoFlex 1030 Looped Cable is 0.4-inch x 30-feet.