I ride an early 90's Trek MultiTrack 700. It's a completely rigid, Cro-moly frame with 700c wheels, and, except for a new rear wheel (double wall rim) and cassette, all of the components are original. I want to begin riding some basic MB trails. Nothing fancy, no jumps or DH riding, just basic hardpack trails. However, I'm 6'2" and 235 lbs. Will a fully rigid frame withstand the abuse of roots and ruts with a rider of my size? Or will I constantly be buying new rims, or risk breaking something more vital? According to my LBS, suspension forks for this style of bike are pretty much nonexistent, so if I need shocks, I'll wait until I can invest in a new frame.
Thanks for your help!
Edit: I rode my first hardpack yesterday, and it was a blast! I'll get a better feel for technique as time goes on, but the bike seemed to handle it like a boss.