Grinding/vibration under load
07-01-19, 01:06 PM
#1
Senior Member
Thread Starter
Grinding/vibration under load
I am getting a strange grinding/vibration through the pedals on certain gears. I notice it when in the 2nd and 3rd largest cogs in the back and the big ring up front. Originally I thought it was cross-chaining, but when I go into the biggest cog on the back I don't seem to hear it. It also only seems to happen when under heavy load (e.g. climbing out of saddle).
I am riding an 11-spd Ultegra Di2. Chain/cassette have less than 2k miles on them and the bike is shifting well.
I can't for the life of me figure out what is going on. Any insights would be much appreciated!
I am riding an 11-spd Ultegra Di2. Chain/cassette have less than 2k miles on them and the bike is shifting well.
I can't for the life of me figure out what is going on. Any insights would be much appreciated!
07-02-19, 03:01 PM
#3
Senior Member
07-02-19, 03:45 PM
#4
- Soli Deo Gloria -
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Chordal action?
2.2.1 Chordal Action
It is supposed to increase with smaller sprockets but riding fixed gear I find that some front/rear combinations just seem worse regardless of sprocket size.
-Tim-
2.2.1 Chordal Action
It is supposed to increase with smaller sprockets but riding fixed gear I find that some front/rear combinations just seem worse regardless of sprocket size.
-Tim-
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