Basically, even today, Tom told me that I'm out of warranty and need to buy a rear wheel as well.
I acted impulsively and quickly bought just the front, but I was wrong, because if I'd bought the set right away, I'd only pay shipping once ($100).
I suggested returning the front and then buying a front and rear set from them, but I'm afraid the return shipping costs will also be paid by the buyer.
They might be able to help me out, but if they don't, they're really bad people. This is already the third set I've bought from them, plus other accessories.
Anyway, trying Ali, they say the warehouse where I bought the goods, which was in France, has been closed and now they have one in Poland, and in any case, they still charge the same shipping cost of $100 or more.