Trouble shifting

[chris__P]

Hey

I'm having troubles shifting my front derailler.

I have Microshift twist-grip selecter, with 3 chainrings. The trouble is the twist-grip is now very difficult to turn, so that shifting from the small chainring to middle is very, very difficult and turning the twist-grip any further (ie to the big chainset) is actually impossible. The cable is very tight, but if I pull at it by hand, the front derailler does move across fully.

My question is, is this likely to be a problem with the mechanism of the twist-grip shifter, or is it something to do with the cable (too tight?), and if so is it easily fixed?

Thanks

 

[AlanW]

Could be that the cable has seized, that's quite a common problem.

High/low screws on mech need adjusting? Doubt it to be honest!

It may seem like a daft question, but I am "assuming" that you are doing this while peddling and moving and not standing still?

 

[chris__P]

Thanks for reply

No, its not the high/low screws, i adjusted them

And yep, whilst moving, although its as hard to adjust while stationary

In what way do you mean the cable seized? Within the shifter?

 

[AlanW]

In what way do you mean the cable seized? Within the shifter?

The actual inner within the outer sheathing, when was the last time the cable were replaced?

 

[chris__P]

they have never been replaced.

How aften should they be replaced?

The bike has done about 3000 miles