Yamaha V-Max

The motorcycle that Emiya Kiritsugu prepared for his Servant. Since it underwent excessive tuning without any regard for usability, a normal person trying to ride it would just end up killing themselves. Maiya must have brought it into town on a truck, then pushed it from the front gate to the courtyard.
The president of Nitro+, Digitarou, was responsible for picking out and configuring the vehicle model.
By the way, at one point during the consultation stage, Mr. Takeuchi had just gotten back from seeing the new Ghost Rider movie and wouldn’t stop going on about how awesome it would be if Saber’s motorcycle could transform too, but, uh… honestly it seemed like it would be a lot of trouble. I was really glad I managed to get out of writing that one!

Fate/Zero material: Fate/Zero Encylopedia