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Old 07-13-07, 05:40 PM   #1
ConstantRider
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Today's Cycling Lesson

I took a minor spill today at the intersection of Skyline and the Great Highway near the San Francisco Zoo. If you're familiar with the intersection, you know there's a three-way stop there. If you're headed north toward SF, you take a left at the intersection and immediately start going up a short but steepish hill. Since the cars never like to wait long for cyclists to clear the intersection, and since it helps to have some momentum for the hill, I typically pedal pretty hard there and that's what I was doing today.

I've popped my chain doing that in the past and did it again today -- only this time I was out of the saddle and leaning forward enough so that soon I was sailing over the bars and headed toward a traffic island. I got unclipped and landed with a semi-roll, and ended up pretty much intact except for a few minor scrapes and bruises. My bike looked good too except for one bent brifter, so eventually I got up and started peddling home. Five gingerly ridden miles later, I was at my apartment door, ready to clean myself up and sit in a soft chair for a while. Unfortunately, when I reached into my jersey pocket for my keys, all I found was a little bit of dirt.

And thus today's cycling lesson: If you crash, always check your pockets before leaving the crash scene.

Unless you want an excuse to add ten more miles to your ride.
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Old 07-13-07, 06:07 PM   #2
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I don't like going that way. There's always a lot of sand on that section of the road. I rather go straight and make a left on Sloat. A bit longer, but also much safer imo.
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Old 07-13-07, 07:15 PM   #3
BlastRadius
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What do you mean popped your chain? That shouldn't happen.
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Old 07-13-07, 08:22 PM   #4
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Quote:
Originally Posted by BlastRadius
What do you mean popped your chain? That shouldn't happen.
Well, I guess the more common term is "chain slip." Except I think that usually applies to when you're shifting and the chain goes all the way off the rings toward the bottom bracket.

What happened today was that I was in the big ring, and as I stood up out of the saddle and started peddling harder, the chain sort of popped off the ring for a moment. I don't mean it broke or anything like that -- but the sensation and sound was more like a pop than a slip, that's for sure. Then, in that moment when I guess the chain had lost contact with the chain ring, there was no resistance but I was still peddling hard, so that sort of launched me over the bars. After I had come to rest and examined the bike, the chain was actually on the smallest ring (I have a triple.) I.E., it hadn't slipped all the way off. Also, it didn't happen in the process of shifting.

I think it's probably time for a new chain, and maybe new chainrings. The chainrings have around 11,000 miles on them. (I've changed the chain and the cassette several times since I've had the bike, but never the chainrings...)
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Old 07-13-07, 08:37 PM   #5
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Quote:
Originally Posted by ConstantRider
I think it's probably time for a new chain, and maybe new chainrings. The chainrings have around 11,000 miles on them. (I've changed the chain and the cassette several times since I've had the bike, but never the chainrings...)
Probably a good idea. The chain shouldn't leave the chain ring teeth especially if you're not shifting.
Glad you weren't injured more seriously.
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Old 07-13-07, 09:14 PM   #6
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Originally Posted by jinws
I don't like going that way. There's always a lot of sand on that section of the road. I rather go straight and make a left on Sloat. A bit longer, but also much safer imo.
This is exactly what I was thinking as soon as I started reading the post. The build up of sand there is not removed as often as it is along the Great Highway when they close it down for that. Also, cars coming south that turn right don't always pay attention to cyclists.
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