Originally Posted by
H.S.Clydesdale
This is my ideal bike. I have never liked the MTB geometry. I tend to stand on the pedals all the time, or sit and coast. But the sitting hurts because no bike seat was ever designed to take all my weight. (230lbs) Maybe a MTB with a huge comfort bike seat... In any case. I think the road geometry is much more comfortable because you can put weight on your handlebars. In the case that you need to go off road, BIG TIRES!
It's actually quite easy to get a cross country MTB rig with which your weight will be nicely balanced. Look especially at mid 90s MTBs.
This is my "time trial MTB" setup. Controls on the barends are so nice. When in flatbar mode, I use a longer, flatter stem and even then weight is nicely balanced between saddle and bars.
Time Trial MTB by
Lester Of Puppets, on Flickr