Well since you are not a powerlifter or body builder I would say you did pretty well with 250. I know many people who do not come close to that that are avid cyclists.

I have never attempted a 1 rep max on leg presses as it is a movment I do after many sets of squats, hamstring curls and hack machine squats. My current high weight on leg press is 580lbs or about 265K for 12 repititions, my current squat maximum is 390 for 4 repititions. I have not attempted a single rep max in a long while. This year is the first in over 10 years I have gotten back on the weights with any seriousness. My personal best lifts when I was at my peak was a 560lb (about 254K) squat at a body weight of 178lbs (81K). At that time I actually did leg presses with over 800lbs (363K). I lived in the gym back in those days.

The world of powerlifting is much different from cycling. When I had that incredible leg power I could not spin high rpms so I was actually not as quick on my bike back in those days. My quads would become so pumped it was like having weights tied to my feet.