Abus lonus 8000 chain lock review

A decent choice

BikeRadar score3.5/5

The Ionus chain lock is a newly updated version of the Abus Steel-O-Chain, which has been rated pretty highly by us in the past. It differs from that model in that the lock mechanism now has a larger square shield.

Inside the new plastic cover is the same clever bolt mechanism, which is fixed to the chain with a 3mm steel armoured case. But, cleverly, both the lock and bolt – at the chain’s other end – are fixed but still allowed to rotate.

This makes it extremely difficult to attack what’s usually the most vulnerable part of this style of lock because levering is made tricky thanks to the freely rotating parts.

In our first test the chain was very resilient to cropping; we dented the links without actually cutting them. Attacking the lock mechanism with hammers and chisels for five minutes created a lot of cosmetic damage but the lock maintained its integrity.

In test two we had power tools on tap and cut through the chain in a little over 30 seconds. Overall, though, this is one of the most portable chains available and is tough to boot. The Ionus comes with two keys.

Warren Rossiter

Senior Technical Editor
Approaching two decades of testing bikes, Warren can be found on a daily basis riding and exploring the road and off roads of Wiltshire's Salisbury Plain in the UK. That's when he's not travelling the world to test the latest kit, components and bikes.
  • Age: 44
  • Height: 188cm / 6'2''
  • Weight: 92kg / 203lb
  • Waist: 86cm / 34in
  • Chest: 112cm / 44in
  • Discipline: Road
  • Preferred Terrain: Big, fast descents and rough surfaces like cobbles or strada bianca
  • Current Bikes: Decade Tripster ATR, Dedacciai Temarario, Cannondale Synapse, BMC Granfondo Disc Di2, Genesis Day One CX, Parlee Z Zero Custom, Storck Scenario Comp Custom, DMR Trailstar, Bianchi Pista, Cube SUV 29er e-bike
  • Dream Bike: Bianchi Oltre Disc, Bianchi Specialissima, Cannondale Slate, Buffalo Bike
  • Beer of Choice: Brew Dog Punk IPA
  • Location: Wiltshire, UK

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