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I've never ridden a 25 so hard to know how I should ride those...like the first half of a 50...?
Sunday was a test of if I could sustain 85% for 50 miles and still run, which was successful, as previously the most I've tried is 200watts for 3 hours, I also learnt I have more to give, especially if I'm not running afterwards, and I know there are lots of minutes here and there to be had with moar power, faster wheels, slightly improved position and arguably more favourable conditions although I quite enjoyed it on Sunday, buy I may as well try and grab as many at once and move from middle of the pack closer to the competitive end!
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How did you stick to "85% of FTP" if you've never ridden an hour flat out? Are you using an estimated FTP? In which case you should ignore your powermeter and ride on feel then check your power meter afterwards - otherwise you're deciding your pacing off some arbitrary number rather than your body. Don't you race 40ks in tri?
The good thing is it's scientifically proven you'll get better at pacing every distance the more your ride each distance.
50s should be ridden like 25s. You'd get your 2min if you rode harder. Worry about your position once you've got the pacing right.