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I am consider buying a 2009 Roubaix. Either an Expert UltegraSL or most likely the Pro with a DuraAce-Ultegra mix. I'm age 49. I live in Chicago so not many hills of much length.

The Pro has the Specialized Crankset compact 50-34, an Ultegra Cassette 12-27 with Dura Ace 7900 Derailleurs Front and Back.

Curious what you think are the usable gears on that? With 10 speed are the 50x27 and 34x12 the only ones truely not usable? Are the next gears up usable, or do they rub, or are they not recommended?

Just trying to figure out if the shipping 12-27 (12,13,14,15,16,17,19,21,24,27) should be replaced.

On my current Trek 7-speed road bike with an Ultegra 53-39 x 13-21 last season I found that 61 to 64 gear inches 39x17 to 39x16 felt good on flats.

On the Roubaix I calc 50x21 or 34x14 to be about 64 gear inches. After much review and considering the low-low 34x12 is not usable(?), it seems the only slight improvement I might make is to a 12-25 (changes ...21-24-27 to ...21-23-25) and that does nothing for what I think would be my sweet spot of 60-70 inches..

Wonder if other Roubaix owners riding the 50-34 can reflect on what gearing they find good on the flats? What gearing they find rubs or is undesirable for some other reasons?

Thanks,

Carl
 

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i have a '08 roubaix expert, ultegra sl, 12-27 and 50-34. I find the 34/12 works okay, no major rubbing and the same for the 50-27.
 

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l ride a roubaix with 50/34 & 12-27 cassette and find it better than standard gearing but l have climbs everywhere l ride, l try to avoid the 50-24 but end up there at times, and 34-13 as the chain will rub against the big ring when in the 34-13. lf you find you do not like the gearing with that combo as some don't, than switching out the 34t for a 36t and changing the cassette to an 11-23 might give you gearing you prefer for flat terrain and should you visit the alps than you will have the gearing already to throw on and enjoy.
 
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