General Discussion Triathlon Talk » 9 speed vs 10 speed Cassettes Rss Feed  
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2005-04-22 11:47 AM

Master
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Shreveport, LA
Subject: 9 speed vs 10 speed Cassettes
As compared to the Ultegra 9, do the Dura Ace 10 and the Ultegra 10 speed cassettes offer:

1 smaller cog (i.e. Less Teeth, Faster Gear)
1 larger cog (i.e. More Teeth, Easier Gear)
1 extra middle cog (i.e Another "In-Between Option")

Thanks for the help.

BTW. I know you have to have a 10 speed to use a 10 speed cassette, etc. I am just think about upgrading components at some point, and wanted to know the difference in this area.


2005-04-22 11:52 AM
in reply to: #146525

Master
1597
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Colorado
Subject: RE: 9 speed vs 10 speed Cassettes
The extra cog is in the middle.
2005-04-22 12:08 PM
in reply to: #146525

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Resident Curmudgeon
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The Road Back
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Subject: RE: 9 speed vs 10 speed Cassettes

Copied this from my answer to a similar question in a previous thread:

The advantage of 10-speed  is smoother shifting, but not so much in the mechanical sense. Smoother shifting as you will have one fewer 2-tooth jump in gearing. Here is the “tooth-count" on the standard 11-23 cassette, 9-speed vs 10-speed

 9-speed: 11-12-13-14-15-17-19-21-23

10-speed: 11,12,13,14,15,16,17,19,21,23

As you see, the 10-speed adds a single 16-tooth cog (a $15 part, ). With the 9-speed (on the 53-tooth chain ring), you shift from a gear ratio of 6.1 (17-tooth) directly to a gear ratio of 6.9 (15-tooth), whereas the 10-speed gives you an option of a 6.5 gear ratio on the 16-tooth.

More meaningfully, at 80 rpm on a 53-tooth this translates into speeds of 19.5, 20.7, and 22.1 mph for 17-, 16-, and 15-tooth cogs, respectively. On the 39-tooth chainring, these speeds are 14.3, 15.2, and 16.3, respectively). This may illustrate the extra effort you will have to put into that mid-gear shift. Personally, I'm rarely on the big chain ring so my shifting is centered around the smaller cogs, the 15-tooth is a climbing gear for me.



Edited by the bear 2005-04-22 12:15 PM
2005-04-22 12:14 PM
in reply to: #146544

Master
1315
1000100100100
Shreveport, LA
Subject: RE: 9 speed vs 10 speed Cassettes
the bear - 2005-04-22 11:08 AM

As you see, the 10-speed adds a single 16-tooth cog (a $15 part, ;-) ). With the 9-speed (on the 53-tooth chain ring), you shift from a gear ratio of 6.1 (17-tooth) directly to a gear ratio of 6.9 (15-tooth), whereas the 10-speed gives you an option of a 6.5 gear ratio on the 16-tooth.

More meaningfully, at 80 rpm on a 53-tooth this translates into speeds of 19.5, 20.7, and 22.1 mph for 17-, 16-, and 15-tooth cogs, respectively. On the 39-tooth chainring, these speeds are 14.3, 15.2, and 16.3, respectively). This may illustrate the extra effort you will have to put into that mid-gear shift. Personally, I'm rarely on the big chain ring so my shifting is centered around the smaller cogs, the 15-tooth is a climbing gear for me.



Bear, thanks for the break down. Seeing the speeds associated with each ring at constant cadence of 80 helps me to see why some would find this very beneficial.
2005-04-22 2:49 PM
in reply to: #146544

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Pro
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Vancouver, BC
Subject: RE: 9 speed vs 10 speed Cassettes
Someone I know just bought a new bike with a 10 speed Ultegra cassette. It's an 12-21 (I think), so it has 12,13,14,15,16,17,18,19,20,21 . It's my understanding that you can get different sizes in the Ultegra 10, so I guess the answer to your question regarding where the extra gear is in the set is it depends on what size cassette you get and what size you have now.

Here's a link too.
http://harriscyclery.net/site/showitem.cfm?Category=110&searchtype=...

HTH,
Jen
2005-04-22 3:39 PM
in reply to: #146549

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Veteran
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Greenville, SC
Subject: RE: 9 speed vs 10 speed Cassettes

If you ever want to figure what the different gearing combinations will translate into mph, here is a good website.  http://sheldonbrown.com/gears/  I agree that it really helps to see it in mph.

I used it to make comparisions when I was thinking about buying a compact crankset.  I'll definitely make the switch to compact once I have the money burning a hole in my pocket :-)



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