General Discussion Triathlon Talk » Rear cassette gearing...opinions needed! Rss Feed  
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2013-07-13 1:49 PM

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Regular
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Evansville, Indiana
Subject: Rear cassette gearing...opinions needed!
Hey everyone, I just bought a new rear wheel and it came with an 11-25 rear cassette on it (campy record 10). My other wheel had a 12-23 on it and my RD is adjusted to work with the 12-23 currently. Now one of these wheels is going to get an aerojacket disc cover on it and will become my race wheel and the will be my training wheel.

My question for you all is which cassette would be best suited for racing the 12-23 or the 11-25? Most of my riding is approx 20-22 on flats, 11-12 going uphill and 35-40 going downhill. The only time I ever use my 12 tooth cog is going down hill. So is it necessary that I sacrifice a middle gear to gain the use the 11? If I switch cassettes will I also need to take the bike in to get the RD adjusted too? I just don't know much as far as rear cassettes go. Your advice is welcomed freely!

Edited by fubar44 2013-07-13 1:53 PM


2013-07-13 1:53 PM
in reply to: fubar44

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Subject: RE: Rear cassette gearing...opinions needed!
Why would you need to change anything?

Your rear derailleur is set up for an inside and an outside limit setting as well as a between the gears setting.

What those gears are is irrelevant. As long as your pulleys are set up to clear the largest cog and keep it snug on the smallest, it shouldn't matter.

Now if you have a spacer between your cassette and the wheel on one and not the other, that's a different story.

2013-07-13 2:27 PM
in reply to: DanielG

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Expert
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Floriduh
Subject: RE: Rear cassette gearing...opinions needed!
+1 on what Daniel said RD only needs adjustment if the indexing is a bit off. And honestly is there that big of a difference in the two cassettes?
2013-07-13 3:21 PM
in reply to: Oysterboy

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Regular
204
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Evansville, Indiana
Subject: RE: Rear cassette gearing...opinions needed!
There isn't much of a difference between the two but when I put the 11-25 on instead of the 12-23 the chain skipped and jumped pretty badly when I shifted into the 11 toothed chain ring so I called my LBS and the guy said I had to adjust the RD and that I could run one or the other cassette but not both with the same adjustment so that why I'm asking my fellow BTers because you all have been so much help in the past that I trust your judgement over a 17 yo kid on the other end of the phone at my bike shop.
2013-07-13 3:50 PM
in reply to: fubar44

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Master
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Salt Lake City
Subject: RE: Rear cassette gearing...opinions needed!
I routinely swap between 11-23, 11-25 and 11-26 cassettes, no adjustment needed.
2013-07-13 3:51 PM
in reply to: fubar44

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New user
61
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South Central PA
Subject: RE: Rear cassette gearing...opinions needed!
You should try to adjust the derailleur yourself as it really isn't too difficult. Just print out the instructions for whatever derailleur you have and go through it step by step. I changed wheels and cassettes a few weeks ago and thought about taking it to my LBS, but figured I should give it a try. It wasn't very hard.


2013-07-13 3:54 PM
in reply to: fubar44

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15

Subject: RE: Rear cassette gearing...opinions needed!
For racing I prefer the 12/23 so there is no big gap in cadence when you're racing at your limit. Of course if you are going to a very hilly race, you. Might appreciate the 25 but otherwise keep the spacing tight in your rear cluster. If you spin out on the 12, I suggest getting aero and coasting.
You don't mention if you're running a compact front ring so I'm assuming 53/39 front.
2013-07-13 4:16 PM
in reply to: Jhbinsc

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Regular
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Evansville, Indiana
Subject: RE: Rear cassette gearing...opinions needed!
I'm running a 53/39 standard front. I'm currently working on adjusting the rear DR but no matter what I do the chain still skips on the 11 chain ring. When I shift into the 12 it's fine but just the 11 is having skipping issues. To me it looks like when I pedal the chain ring is slipping causing the skips. I will try to take a video of it and post it so you can see what's going on
2013-07-13 4:37 PM
in reply to: fubar44

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Regular
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Evansville, Indiana
Subject: RE: Rear cassette gearing...opinions needed!
Here is a video of what is going on. You can see it skipping when I shift all the way down in to the 11. I have messed around with the adjustments to no avail. it works fine in the 12 tooth, its just when it going down into the 11 that I am having problems.

http://www.flickr.com/photos/98846516@N03/9279986946/
2013-07-13 4:39 PM
in reply to: Jhbinsc

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Regular
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Evansville, Indiana
Subject: RE: Rear cassette gearing...opinions needed!
Originally posted by Jhbinsc

For racing I prefer the 12/23 so there is no big gap in cadence when you're racing at your limit. Of course if you are going to a very hilly race, you. Might appreciate the 25 but otherwise keep the spacing tight in your rear cluster. If you spin out on the 12, I suggest getting aero and coasting.
You don't mention if you're running a compact front ring so I'm assuming 53/39 front.


So your suggesting keep the 11-25 for training and use the 12-23 for the races? Most of the rides/races that I do aren't SUPER hilly but usually have some decent rollers in them.
2013-07-13 4:59 PM
in reply to: fubar44

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Expert
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Floriduh
Subject: RE: Rear cassette gearing...opinions needed!
Looks to me like you need to loosen up your RD cable a turn of two to get into the bottom cog. While the spacing should be the same between the various cassettes, it could be off slightly and the RD doesn't have enough slack to let the chain ride on the 11 tooth.


2013-07-13 5:00 PM
in reply to: fubar44

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Resident Curmudgeon
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Subject: RE: Rear cassette gearing...opinions needed!
Who installed the cassette on your new wheel? Not sure about campy but shimano ten-speed has a small spacer that goes on before the cassette. Forget the spacer and it will act as you're describing.
2013-07-13 5:53 PM
in reply to: the bear

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Elite
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PEI, Canada
Subject: RE: Rear cassette gearing...opinions needed!

Originally posted by the bear Who installed the cassette on your new wheel? Not sure about campy but shimano ten-speed has a small spacer that goes on before the cassette. Forget the spacer and it will act as you're describing.

This was my thought too.  I managed to get two spacers in there by mistake once with similar poor results..

2013-07-13 6:20 PM
in reply to: the bear

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Subject: RE: Rear cassette gearing...opinions needed!
Originally posted by the bear

Who installed the cassette on your new wheel? Not sure about campy but shimano ten-speed has a small spacer that goes on before the cassette. Forget the spacer and it will act as you're describing.


Yeah, that spacer caused me troubles until I figured it out too.

Either put it in before the cassette in all your wheels or leave it out in all your wheels and you shouldn't have to screw with the limits.

2013-07-13 6:33 PM
in reply to: fubar44

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Master
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Subject: RE: Rear cassette gearing...opinions needed!
Is your rear de-railer Camy or Shimano? It looks like the guide wheel is hitting the cassete. It may be a problem with the chain length. I would take it in to an "expert"
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