85 on a bike (and tires and roads) of that era... Nuts!

I have a 90's sport bike that can do 140 - even today 85 is about all I car to do with it.

Hell, 1970's cars didn't really do those kinds of speeds well - the suspensions just weren't designed for it, they tended to float a LOT.

There were some really ballsy folks in the early 20th, racing stuff like this with little more than some leather protecting them (notably on their head).