Originally Posted by
Mimoza
These are Challenge Gravel Grinders, no cheap China tires. Their maximum is 3.7 Bar / 52 PSI. They are super fast on paved roads and fine on medium gravel. But I'll change to Secialized Pathfinder TLR Gravel Racing 700x40. They can stand 4 Bar (60 TPI)
Up to about 15 years ago, we used Continental Top Touring 700x35/37 on our tandem for credit card touring. On one trip along the Canal du Midi tow path, we got so many pinched flats (tires at slightly above max rated pressure) that I ran out of patches and spare tubes. Protruding rocks are just really hard on on tires of that size.
My solution was to replace the 700C tandem with 26" wheel'ed tandem when I had the tandem rebuilt (basically new frame and wheels). Now we use 26"x2" slick tires and have not had any snake bite punctures since. YMMV.