Plus Sized Rims for Plus Sized Tires. The Magna is specifically made for plus tires in the 2.8-3.0 range With a 40mm internal width, the Magna 40 is designed to suite wider plus tires between 2.8 and 3.0. The Magna 40 features a thick bead wall adjacent the tire to resist impact deformation, with a wider, rounded top-edge to reduce sidewall cuts. The nipple/spoke bed is oriented to the spoke direction to reduce weakness caused by bend in the spoke at the nipple hole. The Magna is made with premium alloy, extruded and carefully formed for consistent shape. It is then fusion welded and ground for a strong precise finish. Our fusion welding system leaves a perfect seamless joint that becomes the strongest section of the rim ensuring that your rim won't split if you impact at the seam.