Ai_1 wrote:
I haven't used the Inride but I see no point in it.
A speed sensor and a KK Road Machine or Rock'n'Roll gave me sufficiently accurate "virtual power" data. As I understand it the Inride does the same thing as Zwift, using the power curve to determine power from the wheel speed. I'm guessing the Inride roll-down is used to normalise for any inconsistencies between your setup and those used to generate the curves. I think that's largely unnecessary. You need consistency more than accuracy. Set it up the same every time and it doesn't matter too much if your figures are spot on, they'll be consistent.
As I mentioned previously in this thread, after using my KK RM with the speed sensor on Zwift for a couple of years, I got a PM (total power spider based, not one sided crank) and compared data for a few rides. I did workouts consisting of various power levels for various duration intervals. My "virtual power" as recorded by Zwift, was within 1-2% of the figures from my PM with the exception of the first few minutes of warm-up (thus the warm-up before Inride's roll-down test!) and some of the short (<1min) intervals that started with rapid accelerations. Even then the error was not huge (<10%) and occurred during the accelerations. I was impressed. Obviously a different trainer setup and different drive train losses would have shifted the power up or down a little, I got a little lucky, but it still shouldn't change too much.
My advice:
Don't bother with the Inride. Get a speed sensor (and cadence while you're at it) and set up your bike/trainer as follows....
100psi and a reasonable but not super low RR tyre and tube (I used the 23mm Felt TTR tyres and basic butyl tube that came on my tri bike as stock, since I wasn't using them for outdoor rides). I inflated to 100psi and turned the roller compression knob 3 full turns after first contact with the tyre every time. My drive train was fairly unexceptional. Ultegra 6800 with a Wipperman Connex 11SX chain and Rock'n'Roll Gold chain lube. That combo of hardware and setup resulted in accurate power data.
How do you know it’s accurate?
Human Person