I test rode an Aeris 145 in Large and XL (LT). I was convinced I would prefer the large but the XL felt amazing. I’m 6ft 2″ with long arms and legs and obviously benefit from a bike with very long reach. I was looking for a frame only deal and the Aeris ticked all the boxes. I had an Ibis XL frame but always felt cramped on it so was looking for a roomier frame to switch all my nice bits on to. I didn’t have time to test the AM 9 but I would have done if I were looking for another 29er. Definitely test before you buy because the steep seat angle has the effect of shortening the feel of the top tube.
I approached my test ride with an open mind as some reviews said she wasn’t great at climbing but I found it brilliant mainly because of the seat angle. I found the suspension very supportive on the climbs which is one of the main things I look for and she ripped going downhill. For me the riding position, geometry and sturdy feel of the bike gives me a lot of enjoyment and confidence.
I was sold on 29ers when I got a Whyte T129 because it felt stable but the Aeris feels far more stable and I don’t miss the 29 inch wheels at all when I’m riding the Aeris. Despite its length the Aeris feels a bit more nimble and fun in tight, techy woodland trails. Not much between my Strava times on these two bikes. The T129 possibly climbs a tad quicker but the Aeris is a lot better downhill, I suspect the AM9 is a bit better at everything.
The only negative from my initial test ride was that the Aeris felt a little slow to pick up speed on the flat but I think this might have been due to the massive tyres on it. It feels better with my carbon wheels and 2.35 High Rollers.