Stan's Notubes Crest Mk4 29 Wheels Ready to race The Crest rims and wheels have long been Stan's ultralight cross country focused offering. The all-new MK4 Crest wheels take the Crest lineup to a whole new level. The rims now feature a wider 25. 0mm internal rim that works perfectly with modern cross country and gravel tires. Just like with previous versions of the Crest rim, the new MK4 alloy rim is shockingly lightweight, weighing in at just 399g per rim. Due to the use of 6069 alloy the MK4 rim is also incredibly durable and ready to handle whatever you throw at it. With Stan's BST system, mounting tubeless tires and keeping them reliably mounted is dead simple. At the heart of the wheels is Stan's new M-pulse hubs created in collaboration with Project321. They feature an extremely fast 1. 66-degrees of engagement, giving you the advantage in the race to the holeshot at the beginning of a race. The use of Neodymium magnets allowed Stan to virtually eliminate drag while coasting and give you another leg up on the competition. Use of standard J-bend Sapim spokes and Enduro bearings makes periodic repairs and maintenance easy. So what are you waiting for? Throw on a set of Crest MK4 wheels and get ready to race! Features399g 6069 alloy rims are both incredibly lightweight and incredibly strong25mm internal rim width accommodates 40mm-2. 3" tires Stan's BST system keeps your tubeless tires reliably mounted to the rims M-pulse hubs feature a rapid 1. 66-degree engagement J-bend Sapim spokes and Enduro bearings make maintenance simple SPECIFICATIONSWheel Size29"Material6069 Alloy Outer Width28. 4mm Inner Width25. 0mm Rim Height18. 0mm Spoke Drilling32h Valve Type Presta Tubeless Yes Tire Type Clincher Brake Compatibility Disc (6-Bolt)Engagement Degree1. 66-Degree Engagement Upgrade Available No Front Axle12x100mm, 15x110mm Boost Rear Axle12x142mm, 12x148mm Boost Intended Use Gravel, Adventure, Cross Country Approximate Weight743g (Front), 895g (Rear) | Stan's No Tubes | Crest Mk4 29" Wheel Front, 15 X 110Mm | Aluminum