I road my MTB today for the first time in years. I'm certainly not converting, but I've signed up to do a ride in December that is on a dirt road--so nothing really technical, but it does get steep at the end (and includes a river crossing--fun). The bike felt ok, but I really wanted to raise the seat. The post is already extended to the max, so raising the seat would necessitate getting a new post. Which makes me wonder whether I'm just wrong on this. Does one generally aim for the same leg extension on a MTB as on a road bike? Or does the nature of the riding require a more compact position?