My son couldn't change gears on the original grip shifter on his bike, as its so tight.Bought this shifter and new rubber handle and now he can change gears just fine.Was super easy to install, I watched a youtube video first, but was very easy.The bike doesnt move into 7th gear (just 1-6 which is fine for him anyway), but I think it's the bike thats the issue as it not the shifter.