[Stefan]

I am not sure if this video is available in your country.
Those racing tractors reach 40 - 50 kilometer per hour (25 - 30 mph).

Edit: As you can see they tuned the steering and front end (at 2:32).

 

[Stefan]

A few years ago we purchased a Ford YT16 racing mower. Neither me or my dad have actually tested to see what the top speed is, but that thing is fast. We were told it probably maxed out at around 45 mph, which is believable! This spring I need to get one of those gps apps and take a measurement as to how fast it goes.

I can't find any pictures of it.. but its quite the interesting rig.

Pics would be great.

I tested the speed of my tractors with such an app. It went better than I thought it would be.