Are the tires standard?

Yes, all tires used on the Halfbike and Halfbike Pro are standard and widely available. The Halfbike uses an 18"x2.1" front tire and 8"x2.0" rear tires, while the Halfbike Pro comes with a 20"x2.1" front tire and 8"x2.0" rear tires. They can be found in most bike, skate, or mountain board shops, as well as through online retailers like Amazon.