Originally Posted by
merlinextraligh
...
The tandem 509 and 510 were riding clearly wasn't designed to race. But it's all about the motors anyway.
You can also tell the change(s) in tandem design in the past 25-30 yrs, too, in those pics; you hardly see stokers run up the captains' backs like 509/510 does, anymore, unless they're purpose built race rigs.