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I have EA90RTs on my bike and the gf has some Zondas.
Both great riding wheels. Not sure I can really compare the two as I have Ultremo ZX tubeless on mine while she's running tubed tires.Both feel light and stiff.
I weigh 90kg and have ridden over 2000 miles on the Eastons over the Alps, across pothole strewn Italian roads and on my London commute and they have performed flawlessly. Still straight as on day one. I love riding tubeless, great comfort and grip. The ultremo's don't last very well though. I finally got a puncture on the very worn rear around the 1400 mile mark. They were a breeze to get on though although that might be something to do with the wider rim on the EA90s. Mounting tires on campag wheels can be a struggle.
I have Campag wheels on my other bikes and swear by them. They're tough and responsive. I reckon both are safe bets.
The ultegras are slightly heavier unless I'm mistaken.
Trying to choose between the following to accompany new 5800 group. Budget is £300 max, any advice or alternative suggestions much appreciated.
Ultegra 6800
Campy Zondas
&
Easton EA90RT