Of course once I had it installed, I had to go ride the damn thing. I kept my powertap wheel on, as I was anxious to compare the two - I've had horrible reliability with the PT, mostly I get lots of data dropouts. No, it's not batteries - at one point I'd worn out the springs that push the cpu sensors down to the mount, so it wasn't getting a reliable connection. I've replaced the harness. Had to get a new cpu. Despite my attempts, I just ride a lot of extremely rough/potholed roads, and I inevitably lose data.
But I digress again..
Before I set off to meet up with the local we're-tired-from-Worlds group ride, I zero'd out both PMs. The ride itself is a relatively short after-work hammerfest for mostly 4s/5s and non-racers. We do a relaxed roll out to the first climb, and by the second climb the group's usually splintered. Here's the data from the PT and the Cinqo -
Cinqo:
Duration: 1:24:56
Work: 1051 kJ
TSS: 161.6 (intensity factor 1.073)
Norm Power: 241
VI: 1.16
Pw:HR: -0.08%
Pa:HR: -8.19%
Distance: 27.614 mi
Elevation Gain: 1312 ft
Elevation Loss: 1541 ft
Grade: -0.2 % (-232 ft)
Min Max Avg
Power: 0 715 207 watts
Cadence: 20 118 83 rpm
Speed: 0 40 18.7 mph
Altitude: 260 865 580 ft
Crank Torque: 0 721 212 lb-in
Powertap SL (wired):
Duration: 1:24:05
Work: 951 kJ
TSS: 142 (intensity factor 1.017)
Norm Power: 229
VI: 1.19
Pw:HR: 3.05%
Pa:HR: -1.26%
Distance: 26.957 mi
Min Max Avg
Power: 0 645 193 watts
Cadence: 29 209 84 rpm
Speed: 0 40 19.3 mph
Hub Torque: 0 337 74 lb-in
Crank Torque: 0 772 199 lb-in
There are some pretty weird (to me) discrepancies. My head unit for the cinqo is the Edge 500 - so speed is based solely on GPS. I believe the shorter distance shown by the PT data is due to dropouts. But, I don't understand why it shows a higher average speed. Maybe it's trying to compensate for missing data?
The power data is also pretty different, but some part of that will be drivetrain loss and combined with the fact that the PT hub hasn't been calibrated since I bought it..let's just say, I'll trust the Cinqo. Ain't my fault its numbers are higher
I did some more comparisons, using WKO's nifty multi-file range analysis. The following shows the PT data in yellow, cinqo in red, from starting a climb up a sort of undulating hill, then me getting dropped about 3mins in.
Power -
I thought the speed comparison was pretty interesting, GPS versus hub rotations..
So far I love the cinqo. The best part was earlier today when I was packing to head to go out of town, I didn't have to worry about shipping/checking my PT wheel - I just took off the crank, put it back in the FSA box, and threw it in my luggage. So easy. The second BB is for a bike I keep in AZ, where the cinqo will be going with me tomorrow.
Cheers to Quarq!
now i just need me some psimet wheels...