I will be moving to Bristol (UK) and I understand it's quite hilly so I want a mountain bike and since I won't have a car, I will use it to transport things around and don't want to just use a backpack. But I never see baskets on mountain bikes, panniers occasionally. I only see baskets on non-mountain bikes. When I was in Holland, I didn't see baskets on mountain bikes (though Holland barely has any hills so mountain bikes aren't necessary). Is it dangerous to put a basket on a mountain bike? Like it interferes with the gears or something? Thanks