Sun ringle black flag pro sl mtb wheelsetsun ringles flagship wheelset the black flag pro sl mtb wheelset is super light strong and durable this race ready wheelset tips the scales at 154kg has a rim width of 23mm for light and nimble steering you need to have a wheelset that is responsive to your reflexes when a loose rock and stray branch appears from nowhere and premium cartridge bearing straight pull hubs thats a lot of high end tech to give you a comfortable ride stans notub