Originally Posted by
ARGOJIM
RD, every time I write a long answer it gets lost to the signoff demons. The point I was trying to make was all the force would be applied to the outer idler bearing, flange or frame as a potential failure point, the counter rotation of the chains reduces some of the force applied to the bearing and supports, by removing it, it multiplies the force applied at that point. A bearing at the inner frame rail may help this.
I agree, this could be a failure point, but the inner bearing will help.