Protector 10mm chain & Masterlock Excell M50D padlock review£49.70

Bike security

BikeRadar score4.5/5

If you're in the market for something more adaptable than a D-lock, this combination is well worth looking into.

The 10mm hardened steel chain is available in 0.8m, 1m, 1.5m and 2m lengths, and our 0.8m test sample tipped the scales at an impressive 2.12kg.

The internal width of the links is 15mm, so if you buy the chain alone it pays to make sure your padlock shackle will accept a 10mm diameter chain with a 15mm internal gap.

We tested the Masterlock M50D, but this chain will also accept the Squire SS50CS, or Secure-A-Bike padlocks also available from

The M50D padlock weighs a scant 372g yet offers good protection. We managed to open it once under controlled situations, but it took the best part of 40 minutes.

Cutting is quicker – using our portable grinder it took 2min 17sec for the padlock and an impressive 3min 57sec for the chain.

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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