Well, I've placed an order for 2 sets of bearings on RcBearings. Thanks for the tips anyway! I'll see now how fast it will arrive

I'm desperately waiting for them, cas untill they arrive, I cannot do much on the assembling process. I've glued the tires today (they might fall apart as I didn't use too much glue on the first few moves ) They are my first handglued tires