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Stupid question on cassettes! Sorry.

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Stupid question on cassettes! Sorry.

Old 07-11-11, 11:24 AM
  #1  
cyclisteaux
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Stupid question on cassettes! Sorry.

I must have 7 Dura Ace 7900 cassettes on different wheels since I'm too lazy to swap em out. I think they're 11-21, 11-23, and 11-25.

The problem is that I can't tell which is which, so if I go on a hilly ride, I get worked over if I take an 11-21 or 23.

How difficult is it for Dura Ace to stamp the number on the damn cassettes? Haha! Is there an easier way to find out which is which? Other than manually counting all the teeth? I know, I know......I'm a lazy bastard.

Thanks all.
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Old 07-11-11, 11:30 AM
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Just look at them, a 25 is bigger than a 23 and the 21 is the smallest.
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Old 07-11-11, 11:32 AM
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Campy is stamped Im pretty sure
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Old 07-11-11, 12:06 PM
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Shouldn't be hard to tell a 11-21 from a 11-23, or an 11-25.

(Hint: they get bigger)
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Old 07-11-11, 12:44 PM
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Sharpie the number on the rim.
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Old 07-11-11, 12:48 PM
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Sorry, I just lined them all up against a wall and looked real hard to scrutinize size differences. Could not tell the difference and they all look the same. Isn't there an easier way?
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Old 07-11-11, 12:56 PM
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Old 07-11-11, 12:58 PM
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OK, homebrew, I took your advice and manually counted each cassette and sharped the number!

Problem solved. Thank you all for your patience and good advice.
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Old 07-11-11, 01:22 PM
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The 11-25 7900 cassette has only one sprocket spacer while the 11-23 and 11-21 have two. So when you go on one of those hilly rides take the wheels that have cassettes with only one sprocket spacer.

(Exploded views are here: http://bike.shimano.com/media/techdo...9830728250.pdf)
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Old 07-11-11, 05:26 PM
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I wish I had this problem.
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Old 07-11-11, 05:29 PM
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I wouldn't have been able to figure this one out. That's why I don't race.
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Old 07-11-11, 05:51 PM
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dahut
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Originally Posted by HMF View Post
I wish I had this problem.
I know, right?
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Old 07-11-11, 07:41 PM
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Originally Posted by Seattle Forrest View Post
I wouldn't have been able to figure this one out. That's why I don't race.
With only 10 fingers & 10 toes, it's difficult to keep track of those bigger cogs.
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Old 07-11-11, 08:25 PM
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Not sure about 7900 but 7800 is stamped down inside the largest cogs. Look down parallel into the teeth onto the base plate and turn the cassette till you see the markings.
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Old 07-11-11, 08:33 PM
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hammy56
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counting. its hard.
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