with the speed sensor mod on the D2R you are measuring the RPM of the cassette (which would be equivalent to rear wheel RPM were there to be a wheel). the main flywheel is 'geared up' from the rear cassette by a belt. To measure the speed I used a Garmin GSC-10, although any ant+ speed sensor...
i dont think you have to assume any particular wheel diameter. Presumably the power curve was developed by someone whom matched RPM (rear cassette) vs power.
So are you judging your threshold power off your Stages P.M. or from virtual power in Trainer Road and one of the corresponding resistance/power curves?
If it is off the Stages then it must be pretty accurate and thus any perceived differences in your effort on the trainer versus road at the...
I bought a second GSC-10 (but perhaps should have got something different, I'll come back to this later). I have managed to get it working OK with a strong magnet from an old Hard Disk Drive, which is simply stuck to the flywheel at the base of the cassette (no need to remove the flywheel...
I had a play around with this and I do not think it is going to work. I was suprised just how strong a magnetic field is required (e.g. proximity and strength of magnet). Lokks like I will buy another pickup.
I just installed TR and saw the various resistance settings. My ANT+ arrived today, still waiting for the mega magnet.
I have thought about a slight variation of your set-up. Instead of buying another Garmin/Ant+ speed pickup to put on the trainer, I was hoping I might be able to...
I read somehwere that trainer road has multiple power curves (e.g. for different resistance levels). I am just waiting for my ebay purchased magnet & ANT+ USB to arrive to investigate further.
I just got myself a D2R Shadow and am also interested in getting it into Trainer Road. I assume you need to get a magnet and ant+ pickup so that the equivalent speed is transmitted. My question is this, how does trainer road know what degree of magnetic resistance is being applied and therefore...
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