The only bicycle  lock under $50 on the market that we really recommend.

Kryptonite's 785 keyed chain lock is constructed from 7mm thick manganese steel and is stronger than similarly priced U-locks.

A durable weather-resistant nylon sleeve covers the chain links to prevents scratches to your frame.

The 3 foot length is long enough to go around the frame and front wheel at a bike rack or to secure two bikes side by side around a post.

$500 anti-theft protection available at kryptonitelock.com for $15 per year.