I am a type 1 diabetic. I use a pump with a cgms but the senor losses its signal during the ride if it is hot out. I cut my basal rate to 50% and I carry GU or Cliff shots. I also use a cliff bar for long rides. Sunday I did 100 mile ride with 7000ft of total climbing. It was my first century of the year. I had quadruple bypass is Dec of 09 so I was happy to get it done. I have put 2300 miles on my bike this year.