GW - "What the hell is a DH trailbike? whatever you've dream't up short wheelbase isn't going to do you any favours when you need stability for the DH part of your trail. "
i means 'a trail bike as it handles downhill' rather than a DH trailbike as a new category, i wasn't that clear i guess. as in, i know what makes a trail bike biased toward good downhill handling. there are bikes with 140mm travel (full or front) that fit that description.
and no, a short wheelbase wouldn't come into it normally, you can generalise and say long wheelbase = stable, we all know that. but as i was saying with wheel size, one variable alone does not always dictate how a bike handles, you can't judge a bike with one measurement. a 'short' wheelbase 29er could be 43" and that's enough to offer plenty of stability when other factors like a short rear and a slack front are considered. it's relative and i'm not saying it equals a V10 etc, what i mean is that it will handle well at speed downhill within the linitations of say a rgid rear or a 120mm fork etc / not be biased toward climbing at the expense of fun and downhill ability to the majority of riders.