This is our billet 40% reduction for all years of the Honda Fourtrax 300. Requires clearance mods in the upper kick-stopper plate area along with gear indicator cup delete and neutral wire mod. Please see frequently asked install questions. We recommend our stiffer clutch springs for this reduction which can be found in the "Parts" section of the site listed as "300-450 springs". Ideal for 28-29" tires. Pic is an example and may not show correct size.