gears changing at will

SpaceMonkey83

Hi There, I've got some 8 sp shimano sora shifters and derailleur. However lately, sometimes they have not been shifting when I push the lever in or push the button to make them go down. Then suddenly they change gear when I haven't even asked them too, this is both up and down the gears? Any ideas on what this could be before I spend any money out on it?

kentphil

Could just need to adjust the cable tension.

owenlars

http://sheldonbrown.com/autoshift.html

desweller

Cables have probably had their chips. When's the last time they were changed?

macroadie

SpaceMonkey83 wrote:

Hi There, I've got some 8 sp shimano sora shifters and derailleur. However lately, sometimes they have not been shifting when I push the lever in or push the button to make them go down. Then suddenly they change gear when I haven't even asked them too, this is both up and down the gears? Any ideas on what this could be before I spend any money out on it?

Ghost man! run, run away fast and say a prayer :shock:

team47b

SpaceMonkey83 wrote:

this is both up and down the gears? Any ideas on what this could be before I spend any money out on it?

if your front shifter cable is too loose it will change up, if your back shifter cable is too loose it will also change up.

Gears that automatically change down require the cable to be tightened to do this, so this would require something sticking and is less likely.

tighten up the cable tension.

SpaceMonkey83

DesWeller wrote:

Cables have probably had their chips. When's the last time they were changed?

thinking this is it, gonna get some new cables and outers and try that.