You have a good point Bob. I'm sure I'll be picking up just as many thorns in my tires after I put them in. Doesn't look like too many folks have used these so, I'm going to order a couple and give them a try. When I fix the flats the thorns are never over 1/2″ inside the tire so I think the added thickness of the Tube Guard will prevent 95% of my flats. I'll let everyone know how they work. Thanks.