Old 12-15-09 | 09:48 PM
  #5  
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fuzz2050
Real Men Ride Ordinaries
 
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Originally Posted by RaleighComp
I had never stumbled on Sheldon's locking method before, but I get it and am glad it worked out <mostly> for you. The only downside occurs to me based on something I did a few weeks ago. I was hearing this low speed clicking in my rear wheel, exactly once per rotation (I could tell by looking at the label on the rim going by). Above a certain speed you couldn't hear it as the wind noise would drown it out, but it was certainly audible, coasting or pedaling at low speeds. If I walked my bike I couldn't hear it, so it had to be something to do with load. If I put practically all my weight on the seat while walking the bike I could produce the sound, but still couldn't narrow it down. I had my bike up on the stand to do a little maintenance a week or so later and I finally saw it. The rim was noticably "fatter" along a 4 inch section, but just on one side. On closer examination I had a growing crack clear through the machined braking surface that was spreading circumferentially in my 13 year old Mavic 217. I replaced the rim but was interested in investigating the failure. Was the rim cracked because I had worn the braking surface too thin or was it just a happenstance structural failure? So I hacksawed the section out of the rim and then sawed it again right at the center of the crack. The thickness of the rim was certainly adequate, barely different in thickness from the braking surface that hadn't been "braked on". It just had a crack that was spreading around the rim, probably about 4 inches long and almost unseeable when the rim was uninflated, but clear through the braking surface but you wouldn't know unless you examined the section with a jeweler's loop. Glad to not have found that failure out the hard way.

What does this have to do with locking your rear bike wheel through the rear triangle but not around a frame tube or stay? I was simply amazed at how few hacksaw strokes it took to get through the rim. So a thief with a common hacksaw could easily walk off with your whole bike in proabably a minute, albeit with a ruined rim, tire, and tube, but still a nice piece of pilfering.
just wondering, was that a rim alone, or a rim built into a wheel? I've heard tell (no experience myself) that because a wheel puts a compressive force on the rim it's harder to cut. Also, have you tried to hacksaw through a tire?
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