Suppose an electron has a small radius and we look at its radius and mass from the point of view of special relativity. Let's use the idea of (mass x length) = constant. No quantization. Is the contraction to zero radius at c a problem? If so then we can guess how to stop it. One way would be just to write: LENGTH = Rest Length x ( 1-v^2/c^2 + small constant)^1/2 if mass = m0 / ( 1-v^2/c^2 + small constant)^1/2 then: (mass x length) = m0 / ( 1-v^2/c^2 + small constant) x Rest Length x ( 1-v^2/c^2 + small constant)^1/2 = constant = m0 x Rest length Perhaps we can use this as a basis for a field theory with an electron that has a radius and that is not point-like. The small constant would mean that mass does not become infinite but that it reaches a finite value and so rest masses can,in principle be accelerated to the speed of light. If time dilation is considered then the maximum speed a clock on Earth can run compared to a clock at the visible horizon of the universe where v =c is 10^19 seconds ( about the current age of the universe) per second that passes on the horizon.This means that the small constant has a value of 10^ - 38 metres.So if an electron at rest had a radius of 10^ - 18 metres, at the speed of light it would have a radius of 10^-19 x 10^-18 = 10^-37 metres.