I have dura ace on my Trek race bike - the bike has done around 14,000km.
I have noticed recently that there is a weird "grinding" sound from time to time when I am riding, especially when the right pedal goes from 12 - 2 o' clock.
Of more concern is that if I accelerate whilst on the 17, the chain seems to either jump or slip, or maybe it goes in and out of gear, and there is a kind of "crunch" where I pedal hard, and make a half turn without any resistance.....in the best of circumstances this causes me to lose speed, in the worst of circumstances causes me to bang my knee on the bars and get the "nearly went over the handlebars" palpitations....
Being able to jump hard on the 17 is something I need to do about 100 time every time I race, so things are not looking good.
Does anyone have any idea of what might be wrong? I am hoping it is just something I can adjust, rather than the chain being stretched or the 17 being worn down.
I have noticed recently that there is a weird "grinding" sound from time to time when I am riding, especially when the right pedal goes from 12 - 2 o' clock.
Of more concern is that if I accelerate whilst on the 17, the chain seems to either jump or slip, or maybe it goes in and out of gear, and there is a kind of "crunch" where I pedal hard, and make a half turn without any resistance.....in the best of circumstances this causes me to lose speed, in the worst of circumstances causes me to bang my knee on the bars and get the "nearly went over the handlebars" palpitations....
Being able to jump hard on the 17 is something I need to do about 100 time every time I race, so things are not looking good.
Does anyone have any idea of what might be wrong? I am hoping it is just something I can adjust, rather than the chain being stretched or the 17 being worn down.