I haven’t noticed any deadness or harshness from the Zero AM, it just feels like a hardtail compared to my full-sus! Maybe the bigger wheels add the smoothness that the alloy frame loses vs my old 853 Soul? I’ve only ever plummeted off one drop on one occasion in a Lemming stylee, so I can only assume that my old bike had some kind of critical hardware failure! 😉
Whatever you’re looking at, bear in mind that any frames with a full tapered headtube, like a ZS44/56, will give you the option of using an angleset to change the head angle by up to 2 degrees. My modified Bird is now at 64.3 deg HA static and it certainly doesn’t feel too slack, if anything it feels a little steeper than my Spitfire when riding (which is at 65.7 deg static).
The BB heights (or drops) vary a lot on all the bikes in this thread – my modified Bird is probably the lowest with a 55mm BB drop. That might seem really low but it’s similar to my Spitfire when riding. However, it doesn’t suffer poor feet placement gladly – but if you’re used to riding modern trail/enduro bikes and avoiding bashing your pedals on the ground then you’ll be fine with a BB that low – and it’s so good in the turns on the limit of grip.
Don’t just look at top tube lengths because they’ll vary a lot with seat angle – a bike with a steeper seat angle will be longer when you’re standing up, so my Bird is 445mm reach but only 606mm ETT due to the 75.4 deg SA. It’s quite a bit longer than my Spitfire but that feels a good thing when the back wheel is bucking all over the place and the fork has 30mm less squish. The 420mm chainstays definitely keep it nimble enough when you need to chuck it about – emergency manual! 😉