The Rant Ikon sprocket is a great upgrade when it comes to your next sprocket. They come in lots of colors at a great price. Click HERE to view current color options. The Rant Ikon sprocket is a lightweight 25T sprocket built from quality 6061-T6 alloy. This sprocket features 4 guard ports, making the Ikon sprocket compatible with the Shadow Sabotage Guard sold separately in our eBay store. 15/16â€ bore. 19mm & 22mm adaptor included. Weight: 2.3 oz.