On the contrary, the other lady and gentleman admitted going off trail. We told you to stay on the pavement. And ALL TERRAIN doesn’t mean you can run over anything with impunity. Thorns, nails, bombs, aka hazardous common sense items will obviously cause damage. That’s not the problem though. You rode the bike up the hill flat and that’s what ruined our tube and tire liner ($15 and $86 dollars respectively). We don’t charge anyone for getting flats because we can just patch the tube. It should also be common sense that if you damage our bikes, you pay for repairs. One of the reasons you sign a liability waiver, to ACCEPT liability and owness for damages to yourself and our property. I did check the tire pressures, that’s one of the many reasons I don’t let anyone leave without doing a test lap without me observing. I won’t authorize a refund from TripAdvisor and feel free to leave me bad reviews. I will respond by copying and pasting our exact messages so other people understand our policies. By the way, you had 4 flat tires. I generously only charged you for the tube, liner, and labor on one rear tire of the bike that you rode up the hill flat.