I went to a Spec demo last fall to test ride a Roubaix, ended up doing a test ride on a tarmac as well for the hell of it, figured why not since I was there... I fully expected to be buying a roubaix before the test ride given that I have herniated discs in my back, fell in love with the tarmac... saving my pennies now for a tarmac... roubaix was so smooth and quiet it was almost boring... but very nice... then I tried the tarmac, it was amazing how different they were... the tarmac was exciting to ride, every movement translated into forward motion, it kept whispering in my ear "dude, go faster, seriously, I promise, you can do it!"...
a tarmac as you describe with 25's and maybe a 0° stem or +7 stem would be close to ideal for me... I'll take mine with SRAM please...
