Well, sure, don't take advice from a guy who is bigger than you and hasn't had a flat in 3 years. One thing I forgot to mention. If you're changing the tires yourself, you could be getting flats. It took me a lot of practice to get good at it. The trick is to make sure that the bead of the tire remains seated as you are pumping air into it. I do this by pumping a little bit of air in at a time and working the bead until it's too stiff to work the bead on anymore. Over-inflation will also cause flats. I bought a hand pump with a built-in psi gauge so I always know exactly how much air I'm putting in. The 838's can go 35-85 psi, I always put in 42 in each tire. And my bike is pretty hefty, considering without a motor it would still weigh almost 70 lbs and it's a 98cc 4 stroke, so it weighs almost twice as much as a China girl. Like I said, no flats in 3 years. I wouldn't be telling you all this if it didn't work extremely well for me. And the 838's are very durable. After 600 miles, they still look brand new. No walmart brand tire or punctureless design will boast that, certainly not on a motorbike. Most punctureless designs are softer than pneumatic tires, making them wear much faster. And they cost 3 times as much, so if you pay 3 times as much and they wear 3 times as fast, you'll end up spending 9 times as much on tires. Trust me bro, after 4 years of motorbiking, I spent more on tubes and tires in the first year (before I switched to slime tubes, learned how to properly change a tire and put the right amount of air in) than I have in the past 3 years of doing it right. I just bought the 838's this past spring, and they've held up better than any other tires I've ever owned, including a $45 Specialized brand tire.