You are confusing the over locknut dimension (O.L.D.) with the spacing of the hub flanges. The spacing of the hub flanges effects the lateral stiffness of the wheel...wider is better. The O.L.D. has nothing to do with it. However you will find that track wheels are stronger and stiffer than typical road hubs because, having no gear cluster to accomodate, the drive side flange is positioned further out and the wheel is bilaterally symmetrical (or very close to it).