Originally Posted by
pdlamb
As Mark Twain said about watches, “A man with one watch knows what time it is; a man with two is never sure.”
Personally, I believe a cheap speedometer first, followed by the (processed data) GPS, with post-processed GPS data a distant third. Of course Strava gave you a mile and a half per hour better answer, so which do you want to believe?
Segal’s Law.
https://en.wikipedia.org/wiki/Segal's_law
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“Train hard until your legs are tanned, then keep going until the shape arrives.” -Jolanda Neff