Originally Posted by hduncan88
I know it is okay if the frame is a little wider than center-to-center but how wide is too wide?
I can't believe a whole day went by without a reply!
You want the siderails to be supported by the tubes. If they're too far out and don't touch, and only your crossbars rest on the tubes, they put all of the weight being carried on small focal points. This can cause extreme wear or dammage to the tubes. Too wide also makes it hard to keep the frame straight and tightly rigged to the tubes. It can be done, but only with lite rower, not much gear, or lots of crossbars.
Short answer; If the siderails rest on the tubes at all it should work...to a point.