Customer service we'll get back to you if you write a review much quicker than their own website hard to log in and out of the website every time I have to change my password back to the same password every time I want to speak to them they have to send you a link. The bike is not meant for European roads as it does not have a c o c certificate therefore you cannot drive it on roads legally in Europe. it's advertised as a trail of road bike but I would not recommend off-roading with it. this is a cruising bike. You will get approximately 20 to 30 kilometers from each battery if you do the speed of 35kl to 45kl kilometers per hour and you weigh approximately 80kg-90kg kilos. petal assist will increase that. Customer service team will help you out and send you all the relevant parts that you need and send you instructional videos and how to do it but it without the tools and the knowledge of an engineer you're probably not going to be able to do it so you'll have to spend money in a bike shop for them to do it for you. I am able to do most of the work myself but an average person probably can't so keep that in mind. The bike suspension is rough and the front wheel motor doesn't stick to the road so do not engage it unless you're actually moving at 15 kilometers always turn it off if you're going to stop or take off taking off with the front wheel motor on is not safe to wait distribution of the bike means the front of the bike lifts up the front motor off when taking off and that will solve the problem overall it's a good bike with a few issues overall it's fun