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SD70da. Free wheel

DGODGR

Senior Member
I don't know the answer to your question but I do have some anecdotal information.
I used to rent an I/R SD70 from a friend/competitor. Whenever we tried to load it onto my dovetail trailer (it had steel angle iron on the dove tail -steel angle iron + steel roller drum= no traction) it would struggle to climb up the dovetail. It seemed to me that all the propulsion came through the front drum. I now own a Bomag BW177-4 and it is a much better climber in all situations.
 
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