It's on a Trek 1.2, and when I'm on the smallest 2 cogs it starts to contact the front derailleurs

Picture of where it contacts:



So does any have any idea on how to get it to stop rubbing?

Thanks.

can you trim the front derraileur? Can you find an equivalent gear in the larger chainring and middle cog?

It looks like you're on the small chainring. Are you familiar with the trim function of your shifters that with a half-click, will move the FD slightly to the outside w/o upshifting to the big ring? If not, check it out. If you're familiar with it and it's rubbing even after trimming, then try tightening your FD with the barrel adjuster just a smidge to get it to move a bit more to the outside with the trim.

Or...interpret the rubbing noise as a signal that it's time to shift to the big ring.

Try to avoid front small - rear small/big-big... It put's your chain in an angle that will do this "rubbing".

If it's not the problem, try getting it to your LBS so you're sure everything is correct with the settings of that front derailleur.

I'm not sure haha. I'm really new to this, and I still don't have a full understanding of the gears and derailleurs.

Thanks.

It's a triple, so technically not the small one to me, it's the middle. I am not familiar with the trim function, no. But now I have a feeling I should be. I'll try the half click thing on my ride a couple hours. Just from holding the bike up and pedaling it, that seems to have helped the problem. Thanks for that bit of info. Now I'm curious what else I'm completely oblivious too. Haha.

I'll keep that in mind, thanks.

1. Proper Adjustment
2. Avoid cross-chaining
3. Trim with the left shifter to clicks in between cogs

1 & 2 are usually enough.

This link to a Shimano PDF will give you more info on what the shifters are capable of. Don't worry if it's not the exact shifter you have...the principles are the same.

Also, it's tough to beat Sheldon Brown (RIP) for additional tips. Spend a few hours wandering around his website for great info on a wide range of topics.

you could add a touch more tension to the cable (if you have a FD barrel adjuster)

but generally SMALL-12 isn't the place to spend a lot of time.

Apparently some shifters don't have a trim option.... not sure which ones though.

My daughter's bike has no trim, I forget the shifters - Tiagra? Her cage is wide enough to avoid rubbing except on avoidable extreme cases.

Tiagras have trim. i use it all the time on my beater that has a Tiagra triple. (all Tiagra groupset)

I think the 1.2 has a Sora FD and a Tiagara RD. So maybe no trim.

I agree with the suggestion that you take the rubbing as a signal that you should shift up to the big cog on the crank. Just because your bike has 27 gears doesn't mean you should use them all. That may be a hard concept for a new cyclist to get his/her mind around, but it's just the way these things are designed. Cross chaining is a bad habit to get into.

I don't think Sora stuff has trim (maybe in the big ring only), and at least the Sora FD I've used didn't have an adjusting barrel, either. However, if the rub occurs only the two big sprockets, maybe you shouldn't be using them when in the middle ring? Or, you could try to loosen the cable just a bit, but then you might experience rub way too early when going towards the small sprockets.

2200 on up has front trim. Unless they took it out of it recently.

Trim means that you move the shifter (and thus the derailleur) a small amount up or down .... just enough to stop the rubbing .... not a whole shift.