Power to weight ratio ... and weather and terrain
POINT # ONE:
The less weight propelled up an incline the better. Apply the 250 watts of power to pushing 180 lbs up a 4% incline of half a mile and you'll get `X' time result. Apply the same watts to pushing 150 lbs up a 4% incline of half a mile and you'll get up faster.
POINT # TWO:
Weather affects long climbing events, assuming all else remains equal. Hot weather causes our body to heat up and we sweat to cool down. If we are unadapted to hot weather riding we will go slower. If we do not hydrate enough we will both go slower and likely cramp up.
POINT # THREE:
Wind affects long climbing events asssuming that all else remains equal. Climbing into a stiff wind will take longer than climbing with a strong tailwind.
POINT # FOUR:
Endurance. As Eddie Merckx would respond when asked how he got to be so dominant: "Train lots!"
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Last week I was joined by two other cyclists on a long, hilly route.
http://connect.garmin.com/activity/194784590
The temp was between 95 - 105 F.
I was on a recumbent and the other two were on upright / diamond frame bikes.
Rider # 1 was 52 yrs old, 5'8" and weighed 175 lbs.
Rider # 2 was 27 yrs old, 6'2" and weighed 170 lbs.
I'm 5'10" and 66 yrs old. I've gone from 232 lbs last July to around 185 lbs now (12 months).
Both riders have probably logged 1,000 miles within the previous 30 days. They ride the same mountainous terrain as me.
I haven't ridden that many miles (3,416) since January but I've logged a lot of climbing (248,000 feet).
They ride / train in the early morning. I try to ride / train mid-day. I make it a pointed goal to adapt to the heat.
Rider # 1 bailed and called for his wife to come get him in their car just past 50% of the ride. Too hot. His HR was higher than he expected and, wisely, elected to live another day.
Rider # 2 climbed almost effortlessly (easily faster than me). But he couldn't handle the heat. He had to stop twice for 45 minutes each time. At the ride's end he was riding without his helmet, his eye's were sunken and he looked deeply fatigued.
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So, `climbing' is not just `climbing.' Depending on your goal of becoming a better cyclist there are several factors associated with performance. It is how you train for the events that serve as your goal.