(a bit OT) security

Discussion in 'Bicycle Mechanics and Repairs' started by bonj2, 28 Aug 2007.

  1. Go for the almax and spend more on better ground anchor

    1 vote(s)
  2. Go for the almax and keep oxford ground anchor

    1 vote(s)
  3. Get a cheaper chain and keep oxford ground anchor

    0 vote(s)
  1. bonj2

    bonj2 Guest

    basically, two questions:
    1) I remember ages ago on C+ somebody posted a link to a video on youtube that showed some blokes trying to cut through bike chains with various tools, boltcroppers, angle grinders, etc. - I think they managed to get through them all within about 5 minutes (albeit after replacing many of the tools/blades) apart from one which either took ages or they couldn't do it - does anybody remember what that was or have the video?

    2) is welding generally fairly secure? I can't see any reason why it wouldn't be, but just wondering if there's something I've completely overlooked...what i'm considering doing is having a ground anchor welded into the floor of my van. Does anybody know anything about welding, and whether it's likely to be possible / expensive ? If so, is the fact that the floor is painted white like the sides going to be a problem to a professional welder?
  2. xroads

    xroads New Member

    welding is only as strong as the weakest link. Which in this case may be the thickness of the floor panel, which could easily be cut with a grinder or powered hack saw. All depends how determined the thief is.
    Welding to painted steel surface is no problem, as it can be grinded away before welding.
  3. mosschops2

    mosschops2 New Member

    re 2) yes - fairly secure. Probably better than a bolt, in that you'd effectively have to cut the metal away around the ring that you secured in the floor. At that stage, a burgular would be better off cutting through the chain / bike lock that you use. RE paint - not a problem as he/she would most likely remove it before welding. The area around the weld is likely to have all the paint burnt off (top and bottom of the sheet mind), so will need repainting to a) look good inside and ;) help to prevent corrosion on the underside.

    Very possible, and not expensive really. Best bet is find a friendly (car) body shop (ie small, independent, local) to do it for you.
  4. OP

    bonj2 Guest

    hmmm... interesting. i've just had a chat on the phone with a welder who reckons it would be better to use bolts with a thickish plate underneath and above due to the thinness of the metal, but it might involve taking lots of stuff off so as to be able to get to the underneath, as i don't want to drill through the petrol tank or the exhaust or something! I guess i'll have to have a look at the underside to see how feasible that's likely to be, but i just thought welding it on would be easier.
  5. Shaun

    Shaun Founder Moderator

    re 1) I think you saw it in GONE IN 60 SECONDS: The Bike Crime Wave aired on ITV.

    Gone in 60 seconds trailers:

    Sorry, but can't find a video link to the full program ;)
  6. Mr Phoebus

    Mr Phoebus New Member

    I think it's Captain Cropper? YouTube has removed some vids to stop any legal action.
  7. You could always use bolts and then round the edges off, so that a spanner can't get a grip on the bolt head.
  8. mosschops2

    mosschops2 New Member

    Or in my case, your instruction could simply have been to use bolts!!!
  9. rob_mcp

    rob_mcp New Member

    You can get all sorts of secure bolt systems- nuts where the hex bit shears off when torqued up etc. hammering ball bearings into alan key bolts, and i'd have thought this safer (and easier) than welding - You may not want to drill into the petrol tank but do you want to weld above it either!
  10. OP

    bonj2 Guest

    this is true, I think i'm going to go for bolts, not welds. I've rung up a garage that have serviced my van before so know it quite well, and they're very amenable to me bringing it down with the anchor (and the thule 592 rack) to see how it could be done. So what i'm going to do is take it down and have a chat with them to see how they propose to do it. The guy was talking about high-tensile steel bolts aswell which sounded good.
  11. OP

    bonj2 Guest

    aha! I think this was the one
    i'm going to have a watch of it when i get home when i can put the sound on
  12. col

    col Veteran

    Bit of an eye opener,what happens with the guarantee now?
  13. Shaun

    Shaun Founder Moderator

    Bloody scary viewing really, especially in light of the cost of most of those chains!!

    Did you watch the ones about picking D-Locks? Even scarier!! ;)
  14. Keith Oates

    Keith Oates Janner

    Penarth, Wales
    It doesn't bode well for the comparatively small chains we use on bicycles!!!!!!!!!!!!!!!!!!!!!!!!
  15. rikki

    rikki Veteran

    What are you tying up in the back of your van?;)
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