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Why are there no 12-25 Cassettes?(20 posts)

Why are there no 12-25 Cassettes?MeDotOrg
Jul 26, 2001 10:31 AM
I see a lot of 13-26, 12-23, 12-21, but never 12-25. I'm using a 13-26 right now, but think I'm reading for something a LITTLE taller.

What's wrong with 12(13-14-15-16-18-21-23)25?
Oh, I'm sorry, I didn't realize you meant for S*MAHno. Becausebill
Jul 26, 2001 10:41 AM
for Campy 10 sp. it's a very common arrangement.
Oops. My bad. So sorry. Maybe next time (tee-hee).
elitest jerkak
Jul 26, 2001 10:58 AM
why you gotta be mean like that? dude was asking a simple question and you come out with some sort of "I guess you just don't know anything, do you. Aren't I cool, I put you in your place tee hee" attitude. you're such a winner!
Continuous Improvementgrzy mnky
Jul 26, 2001 11:10 AM
I think photo could be improved if the subject were rotated clockwise about 90 degrees..... ;-)
Jul 26, 2001 11:16 AM
on the ridiculous shimano/campy wars, which are funny when they're not entirely pathetic.
I at first did a bit of a double take, because almost all 10 sp. Campy OEM spec'd bikes come with a 12-25. Then, I counted the cogs he was proposing, and I saw nine of them. And then I realized that the joke was on me, he wasn't talking about the nearly ubiquitous Campy cogset but about shimano, which I know nothing about, so I had a little fun with it.
Nice ass, though.
this from a guysobber
Jul 27, 2001 12:33 PM
that can't even do typical set up and maintenance, like adjusting brake pads or derailleurs, on his high zoot Record??? Fer shame.
haha.. bill got an e-spanking (nm)ak
Jul 27, 2001 1:09 PM
send your E-Spanking to Bill@BillsSite.Net
from Blammo! the people that brought you "LOG!" and "LOG For Girls!"

"what rolls down stairs
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what's great for a snack
and fits on your back

it's LOG LOG
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(nobody reads the ones down here anyway, who cares)
Ouch. I think. Maybe. I'm not sure.bill
Jul 27, 2001 6:26 PM
Actually, I'm not at all sure what either one of you guys is talking about, but I think that it's supposed to hurt. Next time, I'll get it, I promise. Until then, have a good 'un.
Huh?bianchi boy
Jul 26, 2001 11:37 AM
Both Campy and Shimano make 12-25 cassettes. Or did you mean: Why don't many people use 12-25 casettes? I used a 12-25 Ultegra 9-speed cassette for a while and really liked it, but recently switched to 12-27 so I'd have more of a granny gear. I have another bike with a 13-29 Chorus 10-speed, which is better for climbing but I miss that 12 gear on downhills.

BTW, the Shimano 12-25 includes 12-13-14-15-17-19-21-23-25

The Campy 12-25 includes the same gears with a 16 as well (10-speed)
Jul 26, 2001 11:38 AM
12-25's are pretty common; check Excel:

re: Why are there no 12-25 Cassettes?Cliff Oates
Jul 26, 2001 11:45 AM
Since you're running a triple, you might find it worthwhile to go with a 12/23. If you end up building a triple 10 speed, then you're set since, as others have noted, a 12/25 cassette is available.
Sorry for the confusion - my faultMeDotOrg
Jul 26, 2001 12:36 PM
I'm talking about a 9speed Campy on with a triple crank. 13-26 is the way that it came originally. (Actually part of a 2000 Veloce group).
although I couldn't get the page to load just now, trybill
Jul 26, 2001 1:15 PM just to see. They have a lot of Campy stuff listed, including Veloce parts. I don't know if Veloce 9 sp. is compatible with, for example, 9 sp. Chorus cassettes, which would be more widely available aftermarket, but if a Veloce 12-25 is listed there, it presumably is available elsewhere (or, you can buy from, although sometimes they are a little ambitious about what they list compared to what they actually can get within a reasonable time).
BTW, I meant no harm with my little "tee-hee," and I didn't (and don't) feel very elite. Irony can be a tough thing to convey.
But you do have to marvel at the way these guys pull up the photo's.
2 Veloce loose cog casettesCliff Oates
Jul 26, 2001 1:54 PM
You could buy 2 loose cog casettes and mix and match. The 13-28 is the only 9 speed casette I know of with a 25t cog. Mix that with a 12-23 and you'd get what you're after.
re: Why are there no 12-25 Cassettes?jaybird
Jul 27, 2001 9:52 AM
I think there is a duplicate gear in there somewhere if you use a 53/39 and a 12/25. Anyone have a gearing chart or calculator handy?
re: Why are there no 12-25 Cassettes?Cliff Oates
Jul 27, 2001 10:12 AM
He's running a Veloce triple. Sheldon Brown's web site has a nifty gear calculator. Here's the probable output for his setup.

5223.8 %4240.0 %30
8.3 %
7.7 %
7.1 %
13.3 %
11.8 %
10.5 %
9.5 %
8.7 %
Jul 27, 2001 10:30 AM
Thanks... That is cool, i have never seen that before... Guess I was wrong, there isnt any duplicates for the double but there was for the triple.
thanks..Cliff Oates
Jul 27, 2001 10:43 AM
Sheldon Brown's web site is very cool. The odds are pretty good that most fundamental bike questions you might have will be answered there someplace.

5335.9 %39
8.3 %
7.7 %
7.1 %
13.3 %
11.8 %
10.5 %
9.5 %
8.7 %

Personally, I call the 53-19/39-14 duplicates along with the 53-23/39-17. Several others are very close too.
Jul 27, 2001 10:54 AM
It is normal for a few to be close especially when you have a triple or a 10sp cassette... I was suprised to see that the 25 didn't cause a duplicate though. I have a book, "Bicycle Science" that is pretty interesting if you are into the details... FYI
thanks..Cliff Oates
Jul 27, 2001 11:42 AM
I would have an easier time telling the difference between those gears by the chain angle and not by anything my legs could feel. I have Bicycling Science, but calculating gear inches is simple math.