Thanks for the info on city riding Mike.

I frequently top 45 MPH going down a big hill in city traffic on a bicycle, and I know that that's too darn fast for that frame and tires.

More questions:
Understood about voiding the warranty. But if you can modify them to go faster, what is the max speed you feel comfortable riding at?

How do you normally transport them to something like the "Whiz in" at Fresno, or take them with you on vacation?

Can you load them onto a bicycle rack, or do you have a pickup truck or trailer?