It's stock, but the 20s on the back give a bit more grunt at the start. With my 22s it was a struggle to get a wheelie, but with the 20s it's easy.
I should have elaborated a bit. This should have read: It's stock, but the 20s on the back give a bit more grunt at the start. With my 22s it was a struggle to get a wheelie in 2nd gear without clutching it, but with the 20s it's easy.
