you remove from your Sram NX 11speed cassette 11/42 the cogs 15T, 17T, 19T, 22T, 25T or 28T (depending on your needs) and you replace it with an ARI 44T, 45T, 46T or 48T upgrade cog,without any additional modification on your biketeeth available are: 44T 45T 46T and 48Treplacement is easy and fast material used is hard anodized ERGAL 7075T6all range of colors is available in our color chart at link weight of 44 teeth cog is 94 gramsweight of 45 teeth cog is 104 gramsweight of 46 teeth cog is 111 gramsweight of 48 teeth cog is 122 grams
ARI spare/upgrade cog for Sram NX 11/42 11speed cassette