Something doesn't sound right. I only have an Active Line Plus which has less power but it is very good indeed on hills. It is most unlikely that changing the tyres will do anything for you. It may well be that either the motor or control unit isn't working correctly. If you bought it from a local shop then get them to check it out. If you bought it online you should contact the seller.Guys i bought this bike today, and it wasn’t what I was expecting. I thought I was getting A 2020 gen 4 motor that would eat the miles away. Instead the bike barely made it up a steep hill in full turbo mode. This is my first e bike, the retailer I purchased off let me borrow a basic electric bike for a few days until mine arrived, and that bike didn’t have the comforts of this cube for sure, but it’s electric performance was brilliant and flew up the same hill this cube struggled with. I’m going to lean ahead and and say it’s the weight of this bike 24kg which Is the main issue. should I change the tyres to shred the weight, or is most of the weight in the frame and battery? Because the way I see it I’ve just spent close to 3k on A Bike that struggles up steep hills. And to top it all off I ran out of charge, this bike is extremely heavy to cycle home without any power.