Where I ride the temperature since May has been in the high 90's with high humidity. When I finish riding - 60 miles or more - I weigh myself and am usually about 3lbs lighter, which means 3 pints of bodily fluid loss. No matter how much I drink, I sweat copiously and can never stay adequately hydrated.pwa wrote: ↑13 Aug 2022, 9:52am Cycling long distances in hot weather is not as daft is it might appear. At speeds above walking pace you have a breeze in your face, so evaporation and cooling do happen. It is when you stop that you feel the heat most. But over a hot day you need a good few litres of water. You cannot economise on water use. I'd be using a big bottle at least every hour, so if I only had two I'd be looking to top up every two hours. That can be problem, logistically.
Some years ago doing Audax rides I would always use camelbaks but got out of the habit. It is though a good way to drink. I put electrolyte tablets in my bottles to help with salt, etc, which seems to be of use.
One thing I do find though is that after about 20 miles I find I have not got through one 24 ounce bottle, but for the remainder of the ride I get through maybe one bottle every 12 miles.