Wheel Size - 27.5" 650b (ETRTO 584x30). Wheels - 26" MTB. Wheels - 27.5” MTB. Wheels - 29” MTB. 'High End' Boost Thru Axle REAR Wheel. Presta valve holePremium quality Taiwan TPI sealed bearings hub (Taiwan's number one quality bearings) -12x148mm Boost Thru Axle.