Small to Big Ring on bike

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2004-10-28 1:13 PM

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Master
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Raleigh, North Carolina
Subject: Small to Big Ring on bike
At least once per session I end up causing the my chain to come off when switching from small ring to big ring. Just had bike to LBS for tuneup and adjustment. Still having problem. What am I doing wrong?

I hate being clipped in, and in the middle of a workout and have to stop for 20 sec and get greasy to fix my chain.

2004-10-28 1:19 PM
in reply to: #76872

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Subject: RE: Small to Big Ring on bike
possible stupid question but is your chain stretched, get your LBS to use that funny tool too see if it is, this could cause it

this has happened to me when changing when going over a big bump but i guess that isnt it! i would check the chain

a
2004-10-28 1:21 PM
in reply to: #76872

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Pro
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St Charles, IL
Subject: RE: Small to Big Ring on bike
jkbostic - 2004-10-28 12:13 PM

At least once per session I end up causing the my chain to come off when switching from small ring to big ring. Just had bike to LBS for tuneup and adjustment. Still having problem. What am I doing wrong?

I hate being clipped in, and in the middle of a workout and have to stop for 20 sec and get greasy to fix my chain.


I've had a similar problem, fixed it by adjusting the limit screws on the front deraileur. Not to knock your LBS, but are you sure they checked the limits on the front? A lot of them tend to leave the front alone, unless you tell them you've having problems with the chain shifting off the ring, in my experience. Not a bad thing, just that they focus on the rear and brakes which is where you'll see the most play/stretch and adjustments needed.

-Chris
2004-10-28 1:38 PM
in reply to: #76872

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Extreme Veteran
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Québec City
Subject: RE: Small to Big Ring on bike
Hi !

This can happen sometimes even if your bike is finely tuned. It may depend on the cog your on while you change you ring as well as the speed (rpm) you have while shifting. However, if this happens frequently, go back to your bikeshop and let them know about the problem.

One tip : you can put you chain on your bing ring after it has come off without getting off the bike just by putting you shifter in the small ring position and continue pedaling. This avoids all the mess on your hands and lets your stay on your bike. Very helpful during races...

Hope this helps.

Christ.
2004-10-28 1:45 PM
in reply to: #76872

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Expert
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Iowa
Subject: RE: Small to Big Ring on bike

My bike worked fine until I took it in for a tuneup - twice during my next race the chain came of twice! It turned out to be nothing more than an adjustment to the front derauiler (sp) - no problems ever since. In my case, it was just a matter of an inexperienced mechanic who did the tuneup. The LBS owner fixed it, so be sure you're working with experienced people.

2004-10-28 4:44 PM
in reply to: #76872

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Master
1791
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Raleigh, North Carolina
Subject: RE: Small to Big Ring on bike
Thanks to all for the replies - I'll check all of these out. I'm definitely going to try to re-set the chain using that method -thanks Christ. I was always hesitant to pedal with a chain outside the big ring figuring I'd damage the derailleur. Hopefully you don't have to be too skilled to do this correctly. The bike shop did check the chain and felt that it was in decent shape. They lubed it up as well.


2004-10-28 5:40 PM
in reply to: #76980

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Subject: RE: Small to Big Ring on bike
Hi Jeff,

Resetting the chain that way might not be the best thing to do to you chainring but compared to the hassle of getting off the bike and spending time (especially during a race...), I choose this method... I mountain bike raced for a couple of years and believe me, doing this once in a while (resetting the chain) causes nothing compared to what MTB chainrings are subjected to. I started doing this on the road and I'm pretty sure that you'll get it easily though, for some reason I don't know, it seems harder to do while training indoors... When I train and my chain goes off the big ring, I reset it as a training for subsequent races. I do think it is a good skill to master...

Have fun !

Christian.
2004-10-28 7:27 PM
in reply to: #76872

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Master
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Kingston Ontario
Subject: RE: Small to Big Ring on bike

Hey Jeff,

My LBS told me never to be at either extreme end of the cog when large ring/small ring shifting.  I used to do that when I was finding the small ring too easy...I would be naturally be at the small end of the cog and then shift up to the big ring....chain would fall off more often than not.  Now it never happens to me.

Good luck with this aggravating problem!

Jen

2004-10-28 7:36 PM
in reply to: #76872

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Master
1791
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Raleigh, North Carolina
Subject: RE: Small to Big Ring on bike
You guys and girls are awesome. Thanks for the great info on my little/big problem. ;-)
2004-10-29 12:41 PM
in reply to: #76872

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Expert
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Evergreen, Colorado
Bronze member
Subject: RE: Small to Big Ring on bike
Just another idea - I found that I would occasionally drop my chain when shifting from the small to big ring on my new bike. Someone suggested that I take care to hold the shifter over until the chain had shifted before releasing it. Previously, I guess I would just click the shifter and release immediately. Haven't dropped the chain since. Of course, this was just me being a total newbie to my STI shifters, so it might not be applicable to someone who has used them for a while.
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