Issue link: http://read.dmtmag.com/i/34501
THE DIAGONAL (BIAS OR CROSS) PLY TIRE DEFINITIONS Diagonal (bias or cross) ply (or conventional) tires are made up of a number of textile cords set on a bias (laid diagonally), criss-crossing one another. Depending on the textile strength of the cord used (rayon, nylon, polyester, and the required size of the tire, there could be from 6 to 20 plies in a bias-ply carcass. Without steel belts to stabilize the tread, the sidewall and tread work as one unit resulting in distortion with deflection during each revolution. This abrasive force creates scrub and generates heat, prematurely aging the components and shortening the life of the tire. The number of cross-plies in a tire tends to stiffen its walls, preventing sufficient flex under heavy load. This causes lateral tread movement that impairs road grip and causes tread abrasion. The heat generated also stretches the textile cords during the carcass life, allowing the casing to grow and making it difficult to match new, used, and retreaded tires in dual configuration. Aspect Ratio example: 10.00-20 (dash (-) designates the diagonal (bias or cross) construction), aspect ratio = 100. Section height is the same as section width. TUBE-TYPE TIRE Tube Code: The proper MICHELIN ® ® ® tube to be used with MICHELIN tube-type tires is designated by the nominal rim diameter followed by a code. Example: Tube for 10.00R20 Michelin is 20N (the R designates radial construction). MICHELIN ® tubes are made of butyl rubber and marked with the trade name “AIRSTOP ”. Because of the extreme flexibility of the MICHELIN tire, it is recommended to use ® ® an “AIRSTOP” tube. These tubes are made with an overlap splice that is stronger than the butt splice used in many other tubes. Some MICHELIN ® tube-type tires may be run with or without a tube. Contact Michelin to determine ® tires that apply. Ensure tire is mounted on a sealed wheel if mounted tubeless. Flap Code: When a flap is required, the proper size to use with MICHELIN tires on each particular rim is designated by a code, the last two digits of which are the rim diameter or rim width. Unless otherwise specified, the flap for the preferred rim is normally supplied with the tire. (e.g. 200-20L or 20 x 7.50) Locking Side Disc Flap Ring Ring Wheel Tube and Valve Tube-Type (Seven Components) Tire Tubeless (Three Components) Wheel and Valve Tire 90 Section Seven: Diagonal (Bias or Cross) Ply and Tube-Type