The Acerbis Spider Evolution is considered the most advanced and innovative disc cover currently available on the market. Its unique mounting system utilizes a central aluminum mounting system that replaces the bike¹s wheel spacer and allows all maintenance jobs such as tire changing or brake pad replacement to be done without having to remove the disc cover. Compatible with brake discs up to 275mm in diameter. Reduced dimensions assures total adherence to the disc and saves weight up to 35% compared to the traditional model. The double resin thermoplastic disk cover has a strong nylon center insert and a polypropylene external spoiler. The Spider Evolution is available in red, green, black, blue, orange and yellow.