It's Shimano 105. I know it will work as well as it does on my other bike. All parts arrived in perfect condition. I am upgrading a 2006 Cannondale CAAD8 and Ribble had silver 105 that matched the original look of the bike. I ordered it over a weekend, it shipped on Monday and arrived in Texas on Wednesday. It took longer for that company named after at tall, South American, river valley dwelling woman to deliver a bottom bracket tool. Well done.