We have had our RadRunners for two months now and are happy with them, EXCEPT we have incurred three flats in the last week. One nail, one tack, and a thorn. The tires are supposedly "Puncture Resistant". The first flat we were 17 miles from home and I had to pay $280 for a tow truck to come get us. After doing some research the next morning I read about Slime Tube Sealant. Called my local hardware store, they had a bottle. I followed the instructions and a YouTube video and fixed the tube/tire in about 10 minutes and the tire has held its air ever since. The stuff is amazing. So I went out and bought 4 bottles, we carry two on each bike. The next two flats I repaired while we were on the road. I recommend that every RadRunner owner carry two 8 ounce bottles (or one 16oz, it takes 8 oz to fill a RadRunner tube), a pair of pliers (to remove nail, etc., I carry a small Leatherman multi-tool) and a hand pump with them at all times. No more flats, or at least a sure-fire way to fix them quickly.