And it sucked! Wow. Not that I didn't expect it to, I'd previously been using an LT estimate from an indoor TT. And that sucked.
Turned out I was right about having underestimated my number previously.
The worst part is that I made a wrong turn and ended up messing around at low speed long enough for my heart rate to drop enough to mess with my average. D'oh! Will have to revisit it relatively soon.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Just did a LT test