"The Industry Nine 1/1 Enduro V5 MX Boost Wheelset uses Hollow Bead Wall rim construction to add impact strength and resist pinch flats on rough, high-speed terrain. A 32-hole Sapim Race steel spoke build keeps the wheelset serviceable over years of hard riding, and the 30 millimeter internal width matches 2. 3 to 2. 8-inch tires for a stable, predictable profile. What Our Gearhead® Experts Are Saying:""Running a 29 up front and a 27. 5 out back on a rock garden, I never feel the rear wheel flex or ping off a hit the way lighter builds do. The bead wall holds up exactly where a pinch flat usually happens."""