we have a circle: [math](x-h)^2+(y-k)^2=r^2[/math] where (h,k) is the center and r is the radius. we now spin the circle about an axis that is perpendicular to the plane on which the circle lies and it runs through the center of said circle. gravity contracts length (and my the equivelance principle, so does acceleration), so as the 1-sphere spins about the axis, the distance between any two points on it decreases while the radius stays the same. since [math]\pi=\frac{c}{2r}[/math], where c is circumference and r is radius, [math]\pi[/math] no longer is a constant. the circle shrinks, but the radius stays the same.
this change in geometry may affect how a string vibrates. that would make a predictable change the properties of the particle. so, my test would be to spin particles as fast as possible looking for a change in properties. if the predicted changes occur, then that is evidence in string theory's favor. what do you think?