chain rubbing on front mech

[ross cordon]

I know not a lot about the workings of my gears but after my ride today I cleaned and lubed my chain and noticed that when in gear 9 and 10 out of ten the chain rubs on the inside of the front mech , so I rang Halfords and the guy told me that there is nothing that can be done about it . he said he can adjust it but then it will rub when im in 1st and 2nd . this doesn't sound right to me . i could have it looked at at my local decathlon because the guy there is fantastic but this will void my warrenty . am i being fibbed too , or is the guy at Halfords right .

 

[uclown2002]

Which ring at front?

It might rub if your in the small ring at front. Avoid large>large, small>small as chain line is distorted.

 

[cyberknight]

Hes right assuming your staying in the same ring at the front, the last two gears at either end should not be used with the opposite chain ring to avoid chain rub which reduces efficiency, is noisy and can reduce parts life.Otherwise its just a case of adjusting your high and low stops and getting your front mech cable tension set correctly.

 

[ross cordon]

I think I see . it rubs when im in large cog at front and 9 and 10 at the rear , is that right then

 

[cyberknight]

I think I see . it rubs when im in large cog at front and 9 and 10 at the rear , is that right then

When you say 9 and 10 do you mean the biggest or smallest at the back?

 

[ross cordon]

the two smallest

 

[ross cordon]

your dealing with the village idiot here , what is the H stop

 

[cyberknight]

http://www.parktool.com/blog/repair-help/front-derailleur-adjustments

 

[fossyant]

Use the park guide linked above.

You need to adjust it so that 10 only just doesn't rub - this gives you maybe till 2 or 3 before it will rub on the big ring (note don't use 1 or 2 of the big rear sprockets when on the big front.

Similar goes if in smallest chain ring and largest rear sprocket. Use the low screw so that the front mech is just off rubbing. You'll then find 8.9.10 might rub, but you should be switching to the big ring before them.

Depending on the levers, you can tap them a little to adjust the trim - i.e. a small tap to move the mech just a notch or two on the ratchet.

 

[Berties]

On some shifters you get the option to trim slightly ie on tiagra, just move the lever slightly,I get this on my genesis cx

 

[steve52]

or you can find an older experianced cyclist, maybe at a club? and they will be more than happy to help, i have turned two sets off orks the right way round (yep halford assembled) and adjusted brakes and gears several times, all free and done in minutes

 

[ross cordon]

thanks guys i think i got it . just adjusted them and will think about what you said re not using small gears at back when using large cog at front and vice versa . thanks people