The wheels are made out of plastic, but they've got enough give so that you can navigate cracks and bumps in the road with ease. Though, you still have to be mindful of cracks and bumps when using this stroller. If there's any indication that your terrain may get bumpy or unevenly paved (e:g., shopping malls) then I recommend getting a different one for those types of areas because they'll wear out faster on flat surfaces with little traction as museum floors do.