I recently bought an older ti frame that I plan on building into a XC bike (for trail riding and fun, not racing). The bike has canti mounts but no provision for a rear disc. My new fork has provisions for a disc, so I was considering either:
A) running a front disc/rear linear pull setup
B) contacting the frame manufacturer (Titus) about having rear disc mounts welded on.
I'd probably rather go with option A because it will be a lot cheaper. Also, I'm not sure how critical it is to run rear discs. Opinions welcome!
Although I've built several bikes, my experience is old school -- this will the first "new" bike I've built in about 10 years. I'd like to put together something that is solid and capable and that will last me as long as my last bike did.