Well I think the safe speed limit is probably around 35mph for an ATV on balloon tires..Honda clearly could produce a 200 mph version but thats not appropriate for this category..geez...the decision is what sort of suspension, transmission and drive line best fits your application...A Rubicon or Rincon offer different solutions and each are engineered A-Z to the max ..think Goldwing of ATV...You'll ponie up for one used but then again you'll sell it quicker and for more when that time comes..keep it all oem.
According to MI. most fatalities are flips on pavement at high speed..this is due to suspension and mud tires, radial or not.
Face it, you can't expect to go 75 safe and go 2 through swamps..the tire limits you.
Honda also... I have two Formen never had to put a dime into them other the gas and oil. My need to get a set of tires on one before long. It gets used all the time for plowing. Both get used for work and trail riding. I like a transmission I control the gear its in. As said the formen is not a race atv but we put a lot of time on back roads and trails.