Im new to this e-scooter thing. I have a A Zero 10X and have fitted it up with some air shocks front and rear. In the front I used a 125mm unit. I found on really big bumps it tends to bottom out. Has anybody used a 140mm (this was the next size up that I could find). I have one on order along with a set of hydraulic brakes. The City I live in is flat and has lots of cycle ways and i just loving the sense of freedom on my scooter.