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Changing a Tire in the TDF

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Changing a Tire in the TDF

Old 07-19-10, 08:08 AM
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Changing a Tire in the TDF

I'm impressed with how fast the mechanics are. When i take off my rear wheel, I always shift into the smallest cog. The riders in the Tour don't appear to do that. Am I wrong?
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Old 07-19-10, 08:23 AM
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Small cog, large cog, so long as you can get the wheel back on again, right?

I generally go small cog because otherwise my brain leaks and I tend to forget which cog the chain needs to go around when I put the wheel back on.

BTW, I am not very fast. I am not TDF mechanic material.
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Old 07-19-10, 08:25 AM
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Depends on how greasy you want your hands, with the rider holding the bike,
the mechanic can easily manipulate the chain into approximately the right cog
manually, and of course the rider will get a manual pushoff til he is clipped in
and has adjusted the RD. For the rest of us, shifting to the small cog is a bit
easier though slower.
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Old 07-19-10, 08:29 AM
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actually as I was reading this I was watching the Mavic neutral support mechanic fumble with Nicholas Roche's front wheel!

I think the riders do shift it inot the small cog but also I bet the mechanics practice alot.

I worked as a 'pit' mechanic and in a neutral support van a few times, the hard part is dealing with the panicky rider.
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Old 07-19-10, 08:33 AM
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It is a Wheel change , rather than a tire change, since the pro tires are glued on sew-ups and spares are glued up in advance.

It is only rare , like major sponsor requirement, that a Pro team will use a wire bead tire.
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Old 07-19-10, 08:43 AM
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I did mean a wheel change. If you accidently put the chain on the wrong cog, does that mess up the indexing for the other gears?
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Old 07-19-10, 08:47 AM
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It should just shift to the gear you previously had it in. Might be a jolt if it jumps several gears, but just eyeballing it should put the chain in the same range of the cassette that it should be in.
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Old 07-19-10, 09:00 AM
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Originally Posted by Equinox
I did mean a wheel change. If you accidently put the chain on the wrong cog, does that mess up the indexing for the other gears?
No, it will shift back to the right place as soon as you fwd pedal. The issue is more of you back-pedal, the chain may jam. By finishing the job with a single turn of the crank while the rider still holds the rear wheel off the ground, you resolve the entire issue.
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Old 07-19-10, 09:03 AM
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Ah, yes. I see. Thank you.
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Old 07-19-10, 09:11 AM
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It really doesn't matter which cog the bike is in except that some larger ones are a problem clearing the idlers.

The trick is to remember which gear the bike was in and put the chain back on the same one. That ensures that the wheel will line up and slide into the dropouts smoothly without the RD pushing it to one side or another. On my own bike I always shift to the smallest cog, either before removing the wheel, or before mounting it. At my age habit trumps memory every time.
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