Made the mistake of riding to the river on our tandem it was 115 but only about 7 miles on our e tandem. we felt bad before we even got there with a too fast heart rate and it was not a hard ride all flat. we waded in the river and cooled off and got ourselves wet before riding home. lesson yearned. I had to ride home from work a day or two later 8.5 miles I had to stop and get a bunch of water to finish the ride. my garmin showed 135 degrees on the pavement.