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Discussion Starter · #1 ·
Hey everyone,

Looking to upgrade my cassette or at least mix it up a bit for some steeper climbs.

Currently I have a 11-25 105 cassette on the rear. I want to upgrade to either a 12-27 or 11-28. I cant really seem to find a 6600 12-27, so it leaves me with a 7800 12-27 or the new 6700 11-28 (I guess they decided to not make a 12-27 in the new Ultegra). I don't really want to spend the extra for a 7900.

My question is: Can I use a 6700 11-28 on my 6600 setup? I don't know what size cage my RD is but I hope it works. Thanks.
 

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Discussion Starter · #2 ·
Well.....just ordered the 6700 11-28. Ill give it a go and let you guys know how it works. Looking forward to a higher cadence on my steep climbs
 

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Rub it............
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Yes you can use the 6700 11-28 cassette with your 6600 RD. You should be able to get away with out any adjustments, however a slight adjustment of the B-screw might be needed.
 

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Discussion Starter · #4 ·
Thanks, just got it yesterday, after my ride of course. Ill install it tomorrow and let everyuone know how it works. More worried about the jump from a 23/25 to a 24/28. Hope its not too dramatic.
 

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Discussion Starter · #6 ·
Yes, compact.

Probably going to end up with a 12-27, where I might place the 11 from another to make it a 11-27.

Just trying to find something that will give me a higher RPM while climbing. Currently on anything around 6% incline or more, I can go up it, just seem to be really mashing it.

Im about 210 lbs right now, and hope to drop under 200. Just need a little extra "help" for the real steep climbs haha.
 

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The rear derailleur (short cage version) on 6600 Ultegra group is rated for 27T gear max, unlike the 6700 rear derailleur, which obviously can accommodate a 28T gear.

To make your setup work, you'll need to change your rear derailleur to the 6700 and it will shift into the 28T for you.
 

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Discussion Starter · #9 ·
Thanks for the help guys......I havn't installed the new cassette in case I need to sell it for a 6600 12-27.

On the other side, Does it matter what size cage I get for a new 6700 RD?? Short cage, long cage? Medium cage? No idea......
 

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Compatability chart from shimano

COMPATABILITY CHART FROM SHIMANO

shimano.com/publish/content/global_cycle/en/us/index/tech_support/tech_tips.download.-Par50lparsys-0025-downloadFile.html/01%29%20Drivetrain%20Compatability%20Chart.pdf
 
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