OJ Wheels 55mm, 78a Paloma Mini Super Juice wheels with pink urethane and yellow core and included grapefruit scented air freshener. WARNING: OJ Super Juice produce speeds that may or may not melt your face off! Mini Super Juice is a slimmed down version of OJ's super tough Super Juice. Straight out of lab, Mini Super Juice wheels feature a reinforced plastic core and completely redesigned shape, all on OJs' classic ultra buttery 78a urethane.