Can't change from mid to big chainring?

[geopat]

Any advice please...no problems going from low to mid ring....only to big...chain does not move over. Help thanks

 

[Radius]

Probably cable tension, cable could be frayed, or just stretched. Look up adjusting front derailleur cable tension, there's info about it on there

 

[redjedi]

This is a good tutorial for adjusting your front derailleur

View: http://www.youtube.com/watch?v=ngm6dr-1na0

 

[geopat]

Thanks for that