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The Sun Inferno X9 wheelset is a super durable wheelset. The X9 6-bolt hubs stay true to Sram’s reputation of high quality precision parts. Sun Ringle did a fantastic job with the Inferno rim. The welded seam is ultra durable. You can rush the trail knowing your wheels will hold up and take whatever you can throw at them. The front wheel is a 6-bolt wheel with a 15mm thru-axle. The Rear wheel is a 6 bolt as well. The rear hub has a 12x142 spacing and diameter.