You'll also go faster than you think you will as long as you don't go off too fast.Probably true, tis the nature of my job.
Just wanna see where I am comparatively, im 19st and dont want to make a fool of myself
The adrenaline, race conditions and encouragement from marshals always give you an extra surge. I thought my fast commutes or solo weekend rides when trying hard were the fastest I could do when analysing Strava or garmin data etc, but the competition manages to eek out a couple more mph.