Ever since I got my bike (Surly Long Haul Trucker), it has been prone to shifting on its own. This is almost guaranteed to happen when I stand up on the pedals, and happens regularly when sitting as well. I have the feeling that this is a dangerous condition.
It seems from reading about the problem that it is due to the cable catching somewhere and creating a clutch effect. (read about it here) There does not seem to be a way to adjust the friction of the shift lever. I've tried:
- greasing the cable guide under the bottom bracket (no effect)
- backing off the tension of the cable with the tension knob on the cable casing (no effect)
Can anyone relate how they overcame this? My next step is to further loosen the cable by adjusting the connection to the derailleur?