Kryptonite Messenger Mini With U-Lock Extender review

A lightweight and portable mid-security lock with a much greater lockable area than you might expect

Cycling Weekly Verdict

The Kryptonite Messenger Mini With U-Lock Extender manages to be lightweight and portable while still providing a decent level of security (Sold Secure Silver) and respectable lockable area. There’s a range of thoughtful design elements which include a shackle with a bent foot, the rubberised coating, a dustcover for the lock barrel and the U-lock extender – which increases the lockable area significantly without adding much to the size of the lock. However, the lack of a bike mount and the fact it comes with only two keys does count against it.

Reasons to buy
  • +

    Lightweight

  • +

    Extra shackle is genuinely useful

  • +

    Relatively secure

  • +

    Sliding dustcover

Reasons to avoid
  • -

    Doesn’t come with a bike mount

  • -

    Only comes with two keys

You can trust Cycling Weekly. Our team of experts put in hard miles testing cycling tech and will always share honest, unbiased advice to help you choose. Find out more about how we test.

The Kryptonite Messenger Mini With U-Lock Extender is intended as something of a goldilocks lock from the American security brand.

>>>Read more: Best bike locks

Thank you for reading 20 articles this month* Join now for unlimited access

Enjoy your first month for just £1 / $1 / €1

*Read 5 free articles per month without a subscription

Join now for unlimited access

Try first month for just £1 / $1 / €1

Stefan Abram
Tech features editor

After winning the 2019 National Single-Speed Cross-Country Mountain Biking Championships and claiming the plushie unicorn (true story), Stefan swapped the flat-bars for drop-bars and has never looked back. 

Since then, he’s earnt his 2ⁿᵈ cat racing licence in his first season racing as a third, completed the South Downs Double in under 20 hours and Everested in under 12.

But his favourite rides are multiday bikepacking trips, with all the huge amount of cycling tech and long days spent exploring new roads and trails - as well as histories and cultures. Most recently, he’s spent two weeks riding from Budapest into the mountains of Slovakia

Height: 177cm

Weight: 67–69kg