Ready to upgrade your mountain bike's rolling performance? This complete MTB hub set has everything you need for a smooth, reliable ride. Made from tough aluminum alloy with an anodized finish, these hubs are seriously lightweight but won't rust or deform on you. The front hub measures 100mmx9mm and the rear is 135mmx10mm - perfect standard sizes for most mountain bikes. You get your choice of 28, 32, or 36 spoke holes to match your wheel build, and they work with 14G spokes. What really makes these hubs stand out is the bearing setup - the front has 2 sealed bearings while the rear packs 4, all sealed tight to keep water, mud, and dirt from messing with your smooth spin. They're compatible with 6-bolt disc brakes and work with 8, 9, 10, or 11-speed cassettes. The rear freewheel has 90 clicks with 4 ratchets - that means quick engagement when you need to power up hills. At about 400 grams for the set (159g front, 240g rear), they won't weigh you down. Comes with both hubs and quick release levers, so you've got everything to get rolling. Perfect for trail riders who want reliable performance without breaking the bank!