I guy I knows wife has a 2016 420 with 28's on it , she does well with it , I have never rode her bike so I couldn't tell you how much it chokes it down ------ I do know I just switch from 27 Swamp Lites to 29.5 Outlaw skinnies on my 300 , I have rode it around the house but not into the woods yet , my 300 has a 54% reduction and you can tell the difference between the tires , 2.5 inches doesn't sound like much , but when you put the two tires side by side there is a huge difference and a good bit of weight difference ---- I think you could turn them but need reduction