Shimano sm rt10 center lock rotorthis high quality disc brake rotor provides long lasting great braking performance. Additionally, its stainless steel surface and alloy spider makes it durable enough for tackling all your everyday braking needs.features material surface stainless steel spider alloy diameter 160mm center lock long lasting great braking performance easy handling and operation for entry level riders suitable for use with resin brake padstechnologies center lock the center lock system makes an easy rotor installation possible with spline mount and a lock ring. The lock ring mounting system reduces the total working hours by shortening the amount of time of both installation and de installation. In addition, the secure fixing by the spline mount enhances precision and rigidity while improving braking efficiency.a 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products.buy shimano components from chain reaction cycles, the world's largest online bike store.