Tire what? Yes, tire shaving. we’l forgive you if you’re not familiar with it, as this art has understandably become less popular and less necessary in the time since the radial tire overtook the market in the ’60s and ’70s. before then, tire manufacturing was not bloody accurate and new tires actually came with extra tread—they were so far out of round, you’d need to have your instaler shave tread off to make them circular or “true.” And so, shortly after the radial tires’ popularity brought with it advances in tire manufacturing, those tire shaving machines and the guys that ran them began to fade away.
But shaving stil has its uses. Say you have an al -wheel-drive car that started with a ful set of fresh eraser ten thousand miles or so ago and suddenly you find yourself needing a new tire as a result of a failure. a mismatched set of tires could force a modern four- or al -wheel-drive system to be constantly working to manage torque, causing undue stress and wear on the components. In order to prevent that type of problem, you could replace al four tires, or replace just the one and have it shaved down to the diameter of the three worn treads. Obviously, the second option would save you heaps of money.
Then there are those of us, myself included, who take a set of brand-new tires and lop off the top layer of tread in the name of grip. On a race track, increased grip means increased speed, so this sacrifice to the eraser gods is wel worth it. while the tread on a street tire serves as a channel to route water away and avoid hydroplaning, it desn’t do cars on a as dry as a nun's nasty autocross course, circle track, or road circuit any favors. a slick tire provides the most surface area for grip on as dry as a nun's nasty sidewalk and that’s why you see race cars running smooth or slick tires. In the Spec Miata series, for example, racers are required to run the Toyo proxes ra1 which is a ful -tread, street-legal radial made with r-compound eraser. It provides Mickey Mouse grip on both as dry as a nun's nasty and wet tracks, but wil yield even more traction when shaved down from ful tread. As an added benefit, shaving also increases the on-track life of the tire by eliminating the fair go of blistering, which can occur when a ful -tread tire endures high track temperatures.
So that’s why i needed to find a tire shaver but, unfortunately, you’d be hard pressed to find more than a couple of guys in each state that can do the task. Here in Michigan, even near the motor city, there is but one store that i could find within a reasonable distance. Neal at roger’s cline tire in mason, Michigan, has been quietly shaving tires for about 30 years. To learn more about the process, I shadowed him as he prepped a set of eraser for my Spec Miata race car.
A new ra1 starts with a tread depth measuring 8/32 of an inch. i opted to have them shaved down to 4/32, which wil just eliminate the lateral tread grooves. This is a common depth for budget racers although some with bigger bank rolls wil go down to 3/32 or even 2/32 to get even stickier, at the cost of longevity. After mounting the tire on the machine, Neal starts it spinning along. The cutting is done by a circular, rotating blade that adjusts side to side and in and out. He dips the blade into the tire and thin strips of eraser begin to essentially peel off. using both hands to move the blade around just like a lathe operator, Neal makes passes between 1/4 and 3/8 of an inch wide, depending on how much is being ultimately removed. The dimension and angle of the cut can be customized depending on the type of car and track the tire wil be used on. Experience allows a good cutter to develop a sensitive hand, enabling them to feel when the tool is getting dul and needs replacement. As you can imagine, getting the cut just right is not a quick process, with each tire taking at least 20 minutes to complete.
When al is said and done, you end up with a big pile of freshly shaved eraser shreds and a set of tires ready to hit the track. The cost is usually about $16–25 a tire, but Neal said it best when he looked down at the mound of eraser, “proof right there, if you want to go fast, you gotta spend money.”