The Mazza XC-Trail MX TLR Tire Set fits a mixed wheel size mountain bike with one 29-inch tire for the front and one 27. 5-inch tire for the rear, both tubeless-ready. A siped center strip rolls fast, outer lugs bite when the trail turns loose, and a 4C Graphene compound layers four rubbers through the tread. Because both tires share the same tread design, the bike carries one consistent character across two wheel sizes. What Our Gearhead(R) Experts Are Saying:"With a big wheel up front and a smaller one out back, I want both to let go the same way in a loose corner. Running the same Mazza tread on each wheel makes the front and rear lose grip in a similar way, so a slide is easy to read."