• Hi Fox,

    The 7.5mm was just my rudimentary guess from using a tape measure. Looking at that link again mine is identical to that (I remember the XR1 on the box now - but doubted it yesterday due to seeing them selling it for the higher price elsewhere on the same site).

    Dunno about going round two rings but it fits my (quite substantial) White Industries ring with ease...

    They have just emailed me back to say this is the one I have ordered for £19.99 - weird it is elsewhere on the site for that price!
    http://www.mandp.co.uk/productinfo/547798/Security/Alarmed-Locks/Xena/XR1-Disc-Lock-Alarm

    110Db and a 7mm gap height - so do we think this will work? I'm guessing yes if the other one is 7.5mm and will fit two chainrings (I only need it to fit one).

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