[coolhandcountry]

That teflon coated harden aluminum is what went out in mine. I don't recommend it. I can't speak about the single speed. I still running the stock upper gear with a two speed. I like the versatilality of it. I do different kinds of running. I can play in low and switch to high a let the tires swell up. Need to come out with some belts in rc tires to keep them in shape. I have not tried the serum factor with duct tape yet.