The two main tires right under the seat are great big but they are puncture proof. The other four tires are little. The guy that delivered it went through everything with me, but little did he know of my memory loss. LOL When he was telling me about the speeds, he told me there's a turtle and a rabbit on it, so when I was gonna go down the ramp, what do I ask him? "Where's the rabbit?" ROFL I meant the turtle!!! My ramp isn't to code so it's a little steep. Can you imagine if I'd found the rabbit??? I would have gone into the tool shed just like my grankids do when they ride my little wheeled garden cart!! LOLOL It wouldn't have been so much fun for me, though! That shed would still be going down the street, taking fences, laundry room and more mobile homes with it! I pity the poor people at the mall! LOL That's when the turtle will come in handy, eh? Maybe I won't go into too many stores any time soon. LOLOL What a trip!!