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Cassette swap

Old 09-22-10, 06:08 PM
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Cassette swap

Can I swap a 12-25 for a 11-28 without doing adjustments? They are both ultegra 10 spd.
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Old 09-22-10, 06:24 PM
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The cassettes will swap ok but you might need a longer derailleur.
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Old 09-22-10, 06:27 PM
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Shouldn't have to adjust the H/L screws.
I'd double check the chain length (but that's just me, I am sure others will pooh-pooh this).
I'd also check the B-Limit screw.

Here's a nice overview of the whole process: https://www.parktool.com/repair/readhowto.asp?id=64

Have fun and make sure you learn something!

PS I respectfully disagree with Mr. Znomit: The Ultegra is rated for a max cog of 27 so you should be OK with the derailleur (27 vs. 28 is a non-issue).
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Old 09-22-10, 06:29 PM
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You'll have to lengthen your chain. I went from an 11-28 to 12-25 and took out two links I think. I also went ahead and re-tuned the cable tension in the RD because it only takes a minute.
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Old 09-22-10, 06:32 PM
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I hope not, I have a SRAM force derailleur. I tried doing this at the bike shop but they didn't have ultegra cassettes. Since they were going to order it, I decided I could order it instead and to do it myself. But they never mentioned anything about changing Deraileur for this new cassette.
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Old 09-22-10, 06:36 PM
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Force is good for 28T max cog - really, don't worry about changing out the derailleur.
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Old 09-22-10, 06:38 PM
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I've got Rival and it worked with the 28t cog.
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Old 09-22-10, 07:47 PM
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Originally Posted by metabike
PS I respectfully disagree with Mr. Znomit: The Ultegra is rated for a max cog of 27 so you should be OK with the derailleur (27 vs. 28 is a non-issue).
He didn't specify derailleur, ultegra is OK with 28 but with 105 depends on the model(which is why you don't see a 28 cassette in 105).

Force is ok to 28
https://www.sram.com/_media/pdf/sram/..._MY08_RevA.pdf
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Old 09-22-10, 07:56 PM
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Originally Posted by metabike
Shouldn't have to adjust the H/L screws.
I'd double check the chain length (but that's just me, I am sure others will pooh-pooh this).
I'd also check the B-Limit screw.

Here's a nice overview of the whole process: https://www.parktool.com/repair/readhowto.asp?id=64

Have fun and make sure you learn something
!

PS I respectfully disagree with Mr. Znomit: The Ultegra is rated for a max cog of 27 so you should be OK with the derailleur (27 vs. 28 is a non-issue).
Such moderation and politeness!
We can use more of that in BF (I'm not being sarcastic).
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Old 09-22-10, 08:01 PM
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Stfu!
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Old 09-22-10, 08:02 PM
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Originally Posted by Gluteus
Such moderation and politeness!
We can use more of that in BF (I'm not being sarcastic).
Thats assuming I'm a Mr
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Old 09-22-10, 08:03 PM
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....PS.. THAT WAS A JOKE

I swap out wheels all the time that have different cogs and all my RDs are 10 sp Ultegra 6600 and 6700. Always works except for the slight misalignment from different dishing.
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Old 09-22-10, 08:11 PM
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Originally Posted by CyciumX
....PS.. THAT WAS A JOKE

I swap out wheels all the time that have different cogs and all my RDs are 10 sp Ultegra 6600 and 6700. Always works except for the slight misalignment from different dishing.

Same here.
12-27, 11-25, 11-23 swapped between 2 bikes, one with Dura-Ace, one with 105 (both 50-34 chainrings).
No problems.
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Old 09-22-10, 08:44 PM
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Ultegra RD here. Changed from an 11-25 to an 11-26 and then to an 11-28 when I switched to a standard crank up front. The ultegra can handle the 28 cog without an issue. As for chain length, I just follow Sheldon Brown's advice. Run the chain around the big ring and big rear cog without looping it through the RD so that you can connect the chain then add one link. Works like a champ.
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Old 09-22-10, 08:44 PM
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Originally Posted by znomit
Thats assuming I'm a Mr
As Casper Gutman might say, "By gad sir/madam you've got me there, I should learn to be more circumspect in my posts."
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Old 09-22-10, 10:44 PM
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No problem. No new derailleur required. Always add a new chain with a new cassette.
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Old 09-22-10, 11:10 PM
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Originally Posted by metabike
Force is good for 28T max cog - really, don't worry about changing out the derailleur.
Yes, but the chainwrap capacity is only 31. Chances are, that means he's going to have to compromise on chain length a little and be careful not to cross shift. Still doable, though. I put my 11-28 on a 105 rear derailleur with my 50/34 crankset. With a little fine tuning and avoiding the big/big combo, it works fine.

Why does everybody only look at max cog size and ignore chainwrap? It's chainwrap that destroyed a derailleur on me in the past. Cog size just makes for a rough drivetrain.
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Old 09-23-10, 05:03 AM
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Originally Posted by urbanknight
Why does everybody only look at max cog size and ignore chainwrap?
Good point. Even though my experience has shown that rated total capacities can be exceeded by a few teeth without any negative consequence, you are correct. As I implied in my first post above, I hope that the OP is "listening" and uses this experience as a learning process for future endeavors.
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Old 09-23-10, 05:07 AM
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I put a 11-34 on a 105 rear derailleur with my 50/39/24 crankset.
No problem. No other changes made.
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Old 09-23-10, 06:14 AM
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If your chain was properly adjusted for a 25 cog cassette, you will need a new chain or you will need to lengthen it. That said, my chain is sized for my biggest cassette, and I switch between a 28, 25 and 23 all the time with no issues.
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Old 09-23-10, 07:19 AM
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Originally Posted by 10 Wheels
I put a 11-34 on a 105 rear derailleur with my 50/39/24 crankset.
No problem. No other changes made.
You have a long cage derailleur, so you get more wiggle room. What I can't figure out is how you got a 34 on there. I've heard others say they've done it too, but my 105 derailleur rubs cog against pulley on the 28 unless I make the chain a link too short. I'm jealous.
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