JT More Top End Speed +1 Tooth Front Sprocket This listing is for a JT replacement front sprocket 1 tooth size bigger than the standard size fitted by the manufacturer Increasing the front sprocket size by 1 tooth will give you more top end speed. The lower gear ratios allow for higher top speeds, compared to higher gear ratios that increase torque for better acceleration. This sprocket is a direct replacement for the original sprocket in the standard original pitch size, so it literally just bolts on in place of the original and can be used with your existing chain and rear sprocket As this sprocket is larger than the original, you will need to adjust your chain after fitting Nb; Fitting this sprocket may cause your speedometer to read slightly high, so when it says you're travelling at 30, you will actually be travelling at closer to 28.