This year at the tour Or 2011 vuelta on the Angliru?
The 42 inner is the same over the whole rotation as a 42 round, and "feels" very comparable. probably nearer 46 at the max and 38-39 at the deadspot. Moving to a slightly bigger cassette will minimise any difference you feel up hill.
However the ovalness does help keep fluidity and momentum climbing better than a round ring IMHO.
O Symmetric Users
Moderator: robbosmans
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So a 42T O.symmetric inner will feel comparable to a standard 42T inner? With Campags biggest 29T rear choice that will effectively give gearing equal to 39/27, which I for one find a tad on the heavy side for long sustained climbs of around 10%. Not that I climb those all the time, but being able to choose suitable gearing for those events is something I'd like to do. Hmm.
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Yeh the osymetric 42 gives the same roll out as a round one. They do a 38-52 in 110bcd if thats any help.