Kids' bikes with rubber wheels
— wheels made of hard rigid material and fitted with solid rubber tyres: these tyres are made entirely of rubber and have no voids and do not require air to be pumped into them. On the one hand, this makes the wheels practically insensitive to punctures and other damage; on the other hand, they “work out” shocks and bumps worse than inflatable ones, and are intended rather for younger age groups, where the loads are small.
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