07-17-2011, 07:58 PM
I could use some pointers as I continue to diagnose this chain issue with my road bike.
When the chain is on the biggest crank and smallest gear on the cassette, and under load, it occasionally slips for a moment and re-catches.
I can't replicate this just by spinning the wheels while inverted or on a bike stand. It only happens when I'm going downhill and over 30mph and pedaling hard. It's not consistent in terms of time (assuming standard cadence) nor cranks (such as, every 2.5 cranks). It may occur between every 5th crank rotation and 10th crank rotation, if at all.
Needless to say, going 30mph is a short lived event on a weekend ride, lasting just several minutes offset by the effort to get up the hill.
I've checked the chain for damage. I've checked the cassette for wear too. It's a 10 speed, so that outer gear only has 11 teeth. The gears change easily, like a hot knife through butter.
When the chain is on the biggest crank and smallest gear on the cassette, and under load, it occasionally slips for a moment and re-catches.
I can't replicate this just by spinning the wheels while inverted or on a bike stand. It only happens when I'm going downhill and over 30mph and pedaling hard. It's not consistent in terms of time (assuming standard cadence) nor cranks (such as, every 2.5 cranks). It may occur between every 5th crank rotation and 10th crank rotation, if at all.
Needless to say, going 30mph is a short lived event on a weekend ride, lasting just several minutes offset by the effort to get up the hill.
I've checked the chain for damage. I've checked the cassette for wear too. It's a 10 speed, so that outer gear only has 11 teeth. The gears change easily, like a hot knife through butter.
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