Road Cycling - shimano ultegra

I just upgraded my bike to shimano 9 speed ultegra, from campy 8 speed. I wanted to know. How do you make the chain not rub the front delrailer in front 39 rear 15 to 12?

Unfortunately it will always rub once you get the bike into the 14 cog or higher while using the 39. I am assuming from your question that Campy does not have this problem. Not much help.

CHEERS.

Mark

Going from Campy to Shimano is defintiely not an "up-grade".

Shimano has the narrowest Chainring spacing. Campy 9 speed the widest. This is probably the reason why you're gettingrubbed the wrong way.

Why hte downgrade?

What Campy line did you have?

Don't worry, Tim, some of us still like Shimano. But, it is pretty tough to keep that rubbing from happening. I end up in the big ring on the bigger rear cogs to keep it from bothering me. I also put a little tension on the rear derailleur with the shifter to move it a little closer to the chain if I don't want to move up to the big ring. I assume that Ultegra will let you do that without shifting all the way up to the big ring.

You can use the "trim" function of the front shift lever. When on the small chainring and you start to get some rub action when switching to a smaller cog in the back...just bump the shifter to the right one small click.

Same thing when on the big chainring and hitting a large cog in the back....bump the down-shift lever on small click to trim.

Good luck!

Paul

djpluv has the solution. I do the same thing, just do one small click on the shifter and it will move the front derailer over just a tad bit. Then it will not rub. I can cross my chain over any direction and not get any rubbing and get smooth operation.

If it still continues to rub you will need to rotate your derailer on the seat tube some to get it straight with the chain.

The trim device on the front der. is the best answer.

My question is why would you want such an angle on your chain line when you are probably duplicating (or close) a ratio you can achieve by changing to the large chainring and a larger cog in the rear?

I only found out about that trim function by mistake a couple of days back, sure makes for a nicer ride :)

Originally posted by Styk33
If it still continues to rub you will need to rotate your derailer on the seat tube some to get it straight with the chain. BINGO!!.... I thought that front DR of mine looked slightly crooked...lol I might not have rubbing issues after this!

Brendon
:beer:

Originally posted by Bikedud
My question is why would you want such an angle on your chain line when you are probably duplicating (or close) a ratio you can achieve by changing to the large chainring and a larger cog in the rear?

I find that my gearing in best useable order (not using low/7th/8th) goes sumthin like this:
LOW 1st
2nd
3rd
4th
5th
6th (trim for this one)
High 4th (trim for this one)
5th etc

Brendon
:beer:

Brendon

If it fells good do it.

I am frugal and try to avoid the excess wear on the drive train. With modern drive trains there is usually overlap in gear ratios. A 51x17 and a 39x13 both yeild 83.1 gear inches. I try to pick the one that gives the best chain line. If you do the math on your rear cogs you may find similarities.

But in the end what is comfortable to you is what's important.

If everything is compatible, you might have what I call "midclicks" between clicks on your STIs. When I use to have full Ultegra, I was able to eliminate the front der chainrub by gently applying pressure to the shifters, which in turn would make "mini" clicks, not a full throw. The result was no chain rub :)

danr, this is what we mean by "trimming" :p just a fancy name for "clicking" lol

Bikedud, I find that Low 1st there is a bit of cross over from the chain ring to the first cog, and about 3rd or 4th the chain is straight - therefore using 5th/6th isnt much different to using 1st :p
Brendon

:beer: