The good news is that both Bike companies are very good to deal with, responsive and helpful and that they both make Demo rides fairly easy to attain. I’ll own up now to owning and loving my Bird Aeris 145.
I’ve ridden both HT’s in last couple of months and enjoyed both. The lower BB on the Bird was a problem in the mild confines of Swinley so amongst proper trails with sticky up rocks etc I’d be a little worried. The Bird Zero riding position was just perfect to me but I felt that the frame gave me a lot more of a pummelling from the cobbles on the trails. Sadly the Solaris test wasn’t over the same ground so I can’t directly compare but could believe frame materials have an effect? The Solaris felt pretty good, responsive and agile, I rode it for 90 mins approx but it really only came alive after a tweak of the bar position, then it was very good indeed. One negative against the Cotic at the moment is delivery timescales, especially if you’re after it as a winter bike?
I’m also looking for a frame that will take both 29 and plus options, so another strike against the Bird there, I’d listen to any arguments about the fact that perhaps it’s a more hardcore focused design than the Solaris? Both bikes were tested on 29er 2.5/2.6 tyres, pressures were tinkered with during the ride to even out differences.
As ever – get yourself a test ride on both, then choose the colour you like most?