How to ride a 25 mile TT?

[Steve vRS]

As per the title. I've done quite as few 10s now and think my best technique is to hit about 165bpm (my max is 180) after a gentle start ramping up and then bury myself for the last 1/2 mile.

I'm doing my first 25 on Saturday so what are the suggestions? Similar routine but maybe I'm for 160bpm?

I don't have a powermeter nor have I had a threshold test so I'm going off HR alone.

Thanks!