Originally Posted by
Lot's Knife
1. They do slow you down.
Not significantly. And what kind of cramp does a flat tire put on your overall speed?

I agree with everything else.
Last fall I did a mountain bike ride. 4 people, 4 bikes, 8 tires. We had 32 flats. One bike had 27 punctures, 1 bike had 4 (it had 1 tubeless tire that got a flat), 1 bike had 1. That leaves one bike that had zero...mine. The one that had 1? I forgot to put the Tuffy back in my wife's tire

Yeah. They work.