the forks are actually a 1/2" and we went to a 5/8's and the front wheel was a 5/8's and we went to a 3/4". The bolt in the front wheel was way to sloppy so I cut the forks down for two reasons, first was cuz the bike sat 1.5" taller in the front so we shortened the forks and Joe welded the front wheel tubes on crooked, so the bolt wouldn't go in straight so I went to a thicker wall (.095) instead of his usual (.065) and went up in bolt size.