With my Razor, for traction possibly the best place to chain is the rear, for 2 reasons. 1st, if the rears haven't slipped, it's a 2x4. If it slips, even a little, the fronts engage. It's like a limited slip from back to front. Next, there's space in back for weights and it's heavy on the rear anyway with the rear engine. Steering might be a problem, though.
