Sorry, why are road bikes narrower than off-road bikes? Agree the handle bars will be narrower on a road bike, but can't you swap (head to tail) the bikes around so the handle bars don't clash with each other?
Surely it's then just down to the crank/pedal extension and I can't see how a road bike will be really any narrower in that department than an off-road bike. You could always take one pedal off if you're worried about that scratching the car? Or if it's a hitch mounted bike rack, can't you get an extender piece to move the bike carrier out from the car more?
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