I don't do much in this forum even though I fit the definition - I'm currently 233# at 6'2" - much too heavy by any chart and vastly too heavy for this sport. I hope you find the following info interesting.
When I started riding, I used to ask my only cycling friend a lot of questions. His most memorable quote was "it's all about the climbing." This from a guy who chose to ride centuries (100 miles) over the Kangamangs pass in the White Mountains.
But I didn't just harass friends, I also read about cycling.
Joe Friel depressed me with his claim that:
- Every kilogram costs 3 seconds over a kilometer on a 5% ascent
I weigh 38# more than my minimum goal, 48# over my preferred goal. If I round that to 20 Kg (1 Kg = 2.2#), that means my fat costs me 90 seconds over one mile at 5% (I think "miles," not "kilometers").
- At 10 MPH, it's 0.25 miles.
No wonder I get dropped on group rides at every climb.
Gravity is a fat rider's friend on downhills, but the advantage is a small fraction of the climbing penalty. Based on a year of riding, almost entirely with fit people, I would guess my downhill advantage is 1-2 MPH - it's a subtle edge. Downhill speeds are faster, of course, and I am using educated guesses for average descent speed.
- 30 MPH would gain 9 seconds (15 yards, roughly 0.01 miles) over 28 MPH over a mile. Argh!
- Lose 0.25 miles going up, gain 0.01 miles going down
On a recent group ride there was a very long and very steep hill around the 25 mile mark. The fit riders (there are very few fat riders in my cycling clubs) had grouped at the top. I yelled "curse you skinny people" as I rode by. They should grasp my sarcasm by now. I kept going because I knew they would catch me on the next climb.
Feel free to point out any errors! Have a great ride.