you can actually buy a " Kart tyre Lathe" to enable tyres to be shaved and profiled to achieve various benefits. 1) tru'ing the diameter to give a better size match and ballance 2) removing the bulk of rubber on the tyre face to give faster temp build up and reduce weight 3) produce a specific diameter tyre to suit a particular " stagger" set up for certain race tracks 4) " profile" the tyre surface to improve the grip and cornering characteristics. ( imagine a tyre with different radii on the edges, or a tyre with one edge larger than the other ?? )
These techniques are commonly used in the USA for oval and dirt track karting. ...tricky with the trusty surform.
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