AIRCRAFT 27.5+ wheels: Based on our new Aircraft rim we offer you now also a set of 27.5”+ wheels. Rear wheel is equipped with Boost standard 148x12mm cassette hub with 4 sealed bearings. Front wheel is equipped with Boost standard 110x15mm hub with 2 sealed bearings. With these wheels you can use up to 3.0 wide tires and mount them in our brand new Primal Plus frames or any other 27.5+ frame which is quickly coming very popular standard in the gravity biking world.