That is kind of the reason I asked the question about starting pressure. They look huge. Mountain bikes run a nominal 65 PSI. I saw a picture of a Pete Riegel bike with a Jones Counter on the front hub. Figured that must be the right one and ran out and got one. First ride on a cloudy day was OK. Then on a clear, fast heat up day (and this is on a 5K) agreement was so bad I had to reride one of the miles. Put a 65 yo 95 on same bike and had same kind of problem running it at about 80 PSI on an 8 mile out and back. After that, I ran a 120 PSI or airless.