Saterday I had cleetless pedals put on my new road bike, and I bought a pair of cleetless shoes, after practicing for a few hours I got the hang of the cleetless system, I also had a computer installed on my new bike. Sunday I took her out for my first real fitness ride, I road 13.2 miles in 46 min 6 seconds with an avaerage speed of 15.94 mph, and a top speed of 22.8 mph (pedaling fast down hill he he he). It rained last night, and not knowing how those thin wheels on my road bike would react to the wet roads, I instead took my Trek Navigator (comfort bike ), and the bike I had been riding up until I got the new bike out this morning for my daily ride. There's no computer set up so I just used my watch, and I went the same distance, only it took me a little over 2 1/2 mins longer to complete the same distance as I did with my road bike the day before. On my roadbike my heart rate was from the mid 140's to a high of 152bpm, on my Trek comfort bike it was in the high 130's to a max of 145bpm. The weird thing and my question is why was I more tired when I got home from my ride on my Trek, than the road bike, also while I was ridding the Trek it seemed harder? I always thought that the higher the heart rate, the harder the work-out, but with the road bike I had a higher heart rate, but I was'nt as tirerd, and it was easier, with the Trek I had a lower heart rate but it was harder, and more tireing!!!??? Can anyone explain this phenomanon ?