Chain rub on a triple - to be expected?

My bike has lower end components, so I'm not really sure what's normal as far as performance goes. I'm wondering if things need to be adjusted or if what I'm experiencing is to be expected.

Here's what going on...

My crank is a 52/42/30 and my cassette is an SRAM 850 12-26 8 speed...front derailleur is a Shimano 2203 and the rear is Tiagra.

Biggest chain ring - all gears are fine, no chain rub. Unfortunately I rarely use this ring because it's really hilly here and there's no way I could get up a hill in this ring!

Middle ring - out of the 8 gears, can functionally use all of them, but the 2 "hardest to pedal" gears have pretty good chain rub going on. I try not to use them.

Small ring - out of the 8 gears, only use about 4 or 5. Easy pedalling gears work fine, but as I shift into harder-to-pedal gears, I start getting major chain rub. By the time I'm up to the 5th gear, it's making so much noise I'm afraid something is going to break.

I hope this is just something that needs adjusting. My difficulty is that I need my granny gears to get up most of the hills around here. But then I'll have a flat or a downhill and I want to be able to pedal, but I don't want to be switching rings every 1/8 mile. It would be nice to be able to use all 8 on the middle and small rings. Any advice would be appreciated :) :) :)

Do you know if your setup has what they call "trim?" It is a way of doing partial clicks on your left hand (chainring) shifter that shifts the front DR small amounts to help avoid rub.

I have heard people say that you almost can't avoid rub with a triple, but I have a triple, with trim, and I don't get rubbing if everything is adjusted right. I'm no good so far with my own adjusting...I tend to really mess things up. But, my LBS is happy to do adjustments for free for me.

I have a triple Shimano 105 setup, 9 speed.

I'm not very knowledgeable about this stuff...just my .02 for what it's worth!

I have Ultegra/105, Truvativ/LX, and Sora/Campy Mirage/2200 mixes. Normally, I won't get it unless I'm "cross chaining" i,e, using the big ring with the biggest cog on the cassette or vice versa.
By "hard to pedal"- are you referring to small cogs or the big ones?

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Originally Posted by Fredwina

I have Ultegra/105, Truvativ/LX, and Sora/Campy Mirage/2200 mixes. Normally, I won't get it unless I'm "cross chaining" i,e, using the big ring with the biggest cog on the cassette or vice versa.
By "hard to pedal"- are you referring to small cogs or the big ones?

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I don't know my terminology - it's so hard to explain in words! :o

By hard to pedal, I mean the smallest gears on the back wheel. So I guess my biggest problem is when I'm on my small chain ring and my smaller gears on the back. And my secondary problem is when I'm on my middle chain ring and the smallest gears on the back. Which I guess means that the problem is when I start cross chaining. Although I think maybe it's cross chaining way before it should be?

Starfish - I'll ask my LBS about trim. I hope I have this option. But I won't try it myself...I'm sure I'd mess it up even worse than it is now! :)

sounds to me like you're OK. I think almost any bike would do that.

Sara,

I'd definitely ask your LBS about trim. I'm still getting the hang of it myself... I posted a thread here a few weeks back because I thought my front derailler was out of whack since I got chain rub up front when I was in the smaller cogs (higher speeds) in the back.

Turned out I wasn't using trim properly. On my bike, when I'm in those gears in back, my shifter for the front has a sort of half shift thing it can do - I push the inside lever a little bit (not allll the way across - just about halfway), there's a sort of pop, and the rub stops. I'm still not real clear on how it works - seems like that adjustment just magically becomes available when I need it.

I need to read up on it. :D And probably ask the bike shop folks for another tutorial.

Sounds pretty normal to me. You can't use ALL gear combinations, because you'll be cross chaining. Once you get chain rub that can't be fixed by trimming the front, it's a sign that you should change to the next front ring.

yes, yes.
don't go farther than the 5th gear in the lower chain ring.

however, you should be able to reach ALL of them in the middle chain ring.
if you can't you need an adjustment.

Ditto to Mimi: Whether you have a double or a triple, you can't use all the gears are your rear cog in all of your combinations up front. You want to avoid as they say above, cross-chaining. That means you don't want to be in your little ring up front and your little gears (harder gears) in the back. Just switch to your next chain ring, i.e. when you start getting chain rub in the back, gear up in the front to your middle chain ring. Mimi is right, you should just about be able to use everything in the back from the middle. Occasionally, this won't work dependent on how big your cog differences are in the back, so you might not be able to use your last cogs in back on the small side and big side from your middle chain ring.

spoke

Cool! So I'm gonna head to the LBS for some possible adjustments, and then try to avoid certain gear combinations. Now that I can actually switch chain rings without dropping the chain every sinlge time, maybe I'll change rings a bit more often. I have Sora shifters so I'm not sure I have those half-click adjustments. Seems like if I mess around with the left-hand shifter, it tries to change rings on me. Perhaps when I go to the LBS, a little lesson will be in order too!

The great advice here just continues to amaze me! Thanks to everyone :)

It's great that you are wanting to learn more about your bike and how it works!!! I only wish that more people in general would take that stance!

As for your bike, it indeed you have Sora shifters, then you're right you do NOt have trim with your front derailleur... that starts with the nine speed drivetrains. But learning not to cross chain is always a good thing, and there are many areas where there are duplicate gear(gear inches) without having to cross chain.... I'm sure tthat your bike shop will be glad to show and explain that to you.

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Originally Posted by ridebikeme

It's great that you are wanting to learn more about your bike and how it works!!! I only wish that more people in general would take that stance!

As for your bike, it indeed you have Sora shifters, then you're right you do NOt have trim with your front derailleur... that starts with the nine speed drivetrains. But learning not to cross chain is always a good thing, and there are many areas where there are duplicate gear(gear inches) without having to cross chain.... I'm sure tthat your bike shop will be glad to show and explain that to you.

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Ahhh, so another thing to add to my list when I upgrade my bike in a year or two...better shifters! No trim with Sora...bummer! As I find more things about my bike that I'm somewhat dissapointed in, I'm thinking it will be more like only one year until I ugrade. But you have to start somewhere. This bike is getting me around just fine and I can beat the poor thing up a little bit and not feel too bad about it.

I still think a trip to the LBS may be in order. But I think working out better gear combos to avoid cross chaining is going to help. What would really help is if my legs were stronger so I didn't need those granny gears so much. But I know they're getting stronger, so it's probably just a matter of time.

I'm plenty strong and I still use my granny gears - A LOT!

It's all in where you ride.

V.

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Originally Posted by Veronica

I'm plenty strong and I still use my granny gears - A LOT!

It's all in where you ride.

V.

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Today my friend and I rode up Iron Mountain Rd. near Pollock Pines. Talk about needing your granny gears!!!

Based on the info and advice in this thread, today I tried changing chain rings more often to avoid cross chaining, and it worked great. I probably switched rings 8-10 times and didn't drop the chain once. Much better. Less noise and chain rub, and better gearing performance in general.

Probably no snow though. Iron Mountain is a beautiful ride.

http://tandemhearts.com/coppermine/a...nowy-group.JPG

This was two years ago.

V.

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Originally Posted by Veronica

Probably no snow though. Iron Mountain is a beautiful ride.

This was two years ago.

V.

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You're right...no snow this year at all! Very beautiful up there today...but very dry already.

Hey, I see a Placerville Bike Shop jersey in that photo!

That's Yellow. She lived in Placerville before moving to Utah. I'm in the red jersey. SadieKate is the other chick. The really tall guy is Bubba, SK's honey. The other guy is Ed, who also lives up there. My honey took the photo. He was doing SAG for us since he had broken his arm mountain biking on Tam.

V.

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Originally Posted by Veronica

That's Yellow. She lived in Placerville before moving to Utah. I'm in the red jersey. SadieKate is the other chick. The really tall guy is Bubba, SK's honey. The other guy is Ed, who also lives up there. My honey took the photo. He was doing SAG for us since he had broken his arm mountain biking on Tam.

V.

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It's a great picture! Ed looks a little familiar to me...I'll look for him on the Placerville Bike Shop rides. I have not met Yellow, but evidently she used to ride practically right past my house. Too bad I wasn't riding back then!

If you guys ever plan to do that ride again, count me in. Even though I didn't make it all the way today, I bet I'd be able to do it in another month or so.

I guess this is officially a thread drift now...

My Specialized Allez Elite was converted from a triple to a double when I bought it. Since then my LBS has looked at it a few times but can't manage to get rid of the rub when I'm in smaller front ring and smalls in the back... I get incredible rub that no amount of shifting or partial shifting can get rid of, consistent through 4 or so gears. The guys don't seem concerned, but they cater to racers on Pinarellos who laugh at my Ultegras.

Tell me that the rub *can* be tuned away?