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I need to change my cassette and rings. I have an old/ abused Ultegra setup. New rear Dura ace derail.
My thought was to move to 10 spd DA... I presently run a 27/12 cassette and 53/39 rings. I like the range, in that I am not that strong. I would like to reduce weight and take advantage of the Compact design.
What would be the equivalent in Compact setup? Am I foolish to think that I NEED the 27? I really do hurt on the hills.
I am short-ish on $$$, so I was going to look for DA 7800 used.
Any suggestions would be helpful. Keep in mind, I would like to drop some bike weight (don't start a rant about weight...it's 'fun' for me to bling up the bike)...
 

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I will start by saying that I don't believe that Dura Ace 7800 came with a compact crank.

The closest equivalent setup to your existing setup would be a compact crankset, 50/34 mated to a 12-25 rear cassette. The high gear (53 to 12) is not as tall with the 50 to 12 combo and the low gear is a bit lower with a 34 to 25 combo. If you want a slightly taller low gear then you can try a 12-23 on the rear instead which will give you more closely spaced gear jumps.

If you are trying to save money then keep your bike the way it is. If the gearing is about ideal for you then why change it? No need to spend money unless you need to, right? The weight savings won't be as much as you may think and the difference in weight may not be enough for you to notice even at the top of a big climb.
 

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AlanS said:
I need to change my cassette and rings. I have an old/ abused Ultegra setup. New rear Dura ace derail.
My thought was to move to 10 spd DA... I presently run a 27/12 cassette and 53/39 rings. I like the range, in that I am not that strong. I would like to reduce weight and take advantage of the Compact design.
What would be the equivalent in Compact setup? Am I foolish to think that I NEED the 27? I really do hurt on the hills.
I am short-ish on $$$, so I was going to look for DA 7800 used.
Any suggestions would be helpful. Keep in mind, I would like to drop some bike weight (don't start a rant about weight...it's 'fun' for me to bling up the bike)...
what exactly are you asking? the dura ace 7800 wasn't made in compact. the newer ultegra sl compact in 172.5 weighs 819g. the dura ace 7800 in the same size but 53/39 weighs 664g. the ultegra sl is great, if you want a compact i'd recommend it.
 

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Well, if you're running a 53-39 crank with a 12-27 cassette currently AND are suffering on hills, going compact could be beneficial (though I don't think there was a 7800 DA compact).

For example, with a 50-34 compact, you could run 11-25 in back. 50x11 is actually a bit taller gear than your current 53x12, and the 34x25 compact low gear is equivalent to about a 39x29, giving you even more of a break on the hills, if you need it.

Or you could just go 11-23, which is a nice tight cassette with a low gear very close to your current 39x27 (just a hair higher).

Squidward is right though, the weight savings won't be huge, and you shouldn't spend the money if your current set-up is good in your book.

I also don't remember if there was an 11-25 'sette in the 7800 line... the 7900 DA does have it, but not sure about 7800. There was an 11-23 in the 7800 tho'.
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