Hey fellow bike-to-workers-

I don't really know what forum to post this in, but as it's a commute bike...

Anyways, I'm buying a KM, and would like to use my current disk-brake 26" wheels and tires for a while, to spread out the cost of buying the frame/fork and new wheels/tires. I'm just wondering if this will be a bad idea. I know the changes will be a lower bb, and less trail (right?) - will this make the bike unstable? I'm thinking it'll be for a couple of weeks (until my next paycheck). Is there anything I'm not thinking about that makes this a bad idea?

Thanks,

Jeremy