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12/25 cassette vs. 12/27 Ultegra Double(13 posts)

12/25 cassette vs. 12/27 Ultegra Doublelott
Jun 4, 2002 12:27 PM
This is sort of the same question as the DA Triple.

I have a Ultegra double with a 12/25. I can climb most hills but its tough and I use the 25 a lot. Is the 27 worth getting or do you think I won't gain a whole lot with it???

Thanks, Larry
Jun 4, 2002 12:32 PM
If climbing hills is tough and you want it to be easier, get the 27. You should notice a difference and it doesn't cost that much. (You'll need a slightly longer chain, too.)
re: 12/25 cassette vs. 12/27 Ultegra DoubleLC
Jun 4, 2002 12:38 PM
It is worth it if you start to blow up on a steep hill. It feels about the same difference as going from the 23 to 25, which is sometimes just enough to take the bite out of the hill.
re: 12/25 cassette vs. 12/27 Ultegra Doublemwood
Jun 4, 2002 12:54 PM
One of the guys I ride with swapped out the 25 for a 28, keeping the rest of the cassette intact. With a 39 ring, he is happy with the results. Just makes for a big jump to the 28.
What will you be losing?rideslikeagirl
Jun 4, 2002 1:05 PM
I had the same sitch recently. I've been riding a 12x26, and have been really suffering on steep stuff (mainly cuz it's still early in MY season).

Silly girl that I am, I thought we could just slap a couple extra gears on there and instant-presto, have a 12x28.

Well, apparently, it doesn't work that way-

I had to forsake my 21 to get the 28 on there. Jeez, I never knew how much I use that one in a head-wind or gradual climb.

The jump was just too big between a couple of them. And, besides, I didn't notice a bit of difference between the 26 and the 28.

I've since had my old gears put back on and the triple just arrived today. Yippee! Oh, happy knees!!

Good luck-
re: 12/25 cassette vs. 12/27 Ultegra DoubleNo_sprint
Jun 4, 2002 1:29 PM
Firstly, 25 or 27 is not going to make or break you. If you ride in the steep mountains mostly and feel struggling continuously with the 25, go with the 27. If you prefer a different type of riding go with the 25. Around here most of my teammates and I are climbing vicious hills all the time with the 25s. We move to 11-23s or so for racing. We consider the 25s our trainers. Rare is a 27 on a racer around here. 11s are critical in downhill sections of road races. A rec rider is a different story.
re: 12/25 cassette vs. 12/27 Ultegra DoubleChen2
Jun 4, 2002 3:04 PM
I have both a 12-25 and a 12-27. For me the difference is significant but usually I'm happy with the 25 unless it is late in a long ride and I'm very tired. With Shimano 9-speed 12-25's or 12-27's it is not possible to replace just the biggest cog because they are built together with the next two cogs. With a 12-25 it is possible to replace the 12 and 13 with a 13 with built in spacer and then add a single 28 resulting in a 13-28, this would be a good hill climber and a 13 will take care of any high speed rides on flat roads.
I made that change last year.look271
Jun 4, 2002 3:44 PM
Never regretted it. I don't race but am a strong rec rider. I use the 24 alot (it's next to the 27) but it is nice to have that bail-out gear when you need it, and, frankly, there are a few hills here where I'm really glad I have the 27.
I made that change last year.Wingz
Jun 4, 2002 8:59 PM
...Question to all that replied.

Why isn't a triple an option, or why wouldn't you recommend a triple in this instance?
Not a bad option.look271
Jun 5, 2002 9:34 AM
However, I have Mektronics and didn't want to swap-out the whole gruppo (new rear der, shifters, crank, front der, bb.) When I build up a new bike, a triple will be considered, although I haven't been in any ride that I really NEEDED one.
27 is a great thingDuane Gran
Jun 5, 2002 4:33 AM
The term "steep" is rather subjective, but if it feels too steep for you then by all means get a 27. I keep a variety of cassettes handy and pull out my 27 when riding in the mountains. Maybe I don't need it, but if I blow up or hit a really nasty section I'm glad if I have it. My buddies are welcome to slog up on their 23 but I'll sit 'n spin thank you 'maam.
Same topic, previous posthrv
Jun 5, 2002 7:27 AM

Starliner "12-25 or 12-27?" 2/13/02 10:06am
re: 12/25 cassette vs. 12/27 Ultegra DoubleScott S
Jun 5, 2002 9:51 AM
Have you thought of an XTR rear deraileur and 11-34 cassette? I have a road touring bike that came equipped this way. If you need more climbing power, an increase from 25 to 34 tooth spocket would make a more meaningful improvement than increasing from 25 to 27.