I definitely put the 155mm Rotor crankarms to the test today. Started my ride late, 1:30pm, so the heat was going to be tough. We’ve had NO heat to speak of yet here in Virginia, USA, so I’m far from acclimated. Temp reached 87F degrees.
I started out to do my Seahorse Century 100mile course, with over 8000’ elevation gain. I found myself pushing harder than I should have, but liking it. My HR was too high many times, power looked about where it should to me, so I felt the XCADEY XPower-S Gen2 spider meter was reasonably on target. My course had a LOT of uphill, with some steep climbs that weren’t terribly long as things go around here, but long enough to hurt and always with long approaches that took a toll.
I felt good, and I could tell it took more force applied to the pedals than before, so I was using lower gears more of the time, but it felt fine…
That lasted until almost my first PITSTOP at 45 miles, at which point, I realized I was COOKED when I started out again with fresh icewater with electrolytes and Hammer Perpetuem in my bottles again.
At the last mountain peak before that, 33 miles into the ride, I was averaging 142bpm, 88rpm, and 157W, all strong numbers for me. I was at 14.7mph at the 45mile stop, having climbed about 4000’ at that point.
Once I started out again after the stop, I knew I wasn’t going to last for the full distance. I had 1100’ to gain in the next 5 miles, with over 800’ in 1.75miles. I couldn’t really avoid that climb, so I stayed with the route and did it, but I had to just steadily crawl up in low gear, trying not to blow up completely. My stomach was a bit upset because I had overdone the effort early on and the heat was really hitting me at that point.
The descent was longer than the climb and on a very curvy switchback descent that had gravel tossed across the pavement on every corner, so there was not much relaxing.
After I got back to the valley floor, I had a long straightish road with barely any drop, less than 1%, so it was steady pedaling. I stayed easy on the pedals because as Phil and Paul always said, “There was no more coal in the boiler room.”
I messaged my wife, who was compassionate and willing to come pick me up to save me from the remaining 40-ish miles, with another substantial climb (that I could bail on) but lots of smaller ones too, so I was really thankful for the option.
By the time she reached me, I was about to hit 75 miles, and did just under 5800’ of elevation.
Overall, I’m very happy to have the shorter cranks in place. It’s too early to tell much because today was such an outlier ride in several ways, and I know I need to get several rides on them to adjust to the changes in gear choice timing, as well as body position on the bike. I definitely could tell I was staying comfortable at a lower aero position than I have been able to before. That was a very positive thing.
The loss of some torque was detectible, but didn’t feel discouraging to me, even though I already ride out of spec with cassette choices to achieve lower gears. (50/34 compact crank and 11-40 XT cassette, on an Ultegra 11 speed mechanical setup.)
Overall, I’m pleased with the first day out on the shorter crankset, and look forward to how it changes things for me over time. As to higher cadence, I ended the day with an 84rpm average, not as high as it looked like it would be after the first 35 miles, but after bonking some later, it really pulled my average down. The 84 is probably close to my previous norm, though with all the climbing, it probably would have been a couple points lower in the past.
Here’s my Seahorse Century course screenshot (which I didn’t complete today, but have in the past.)