Lonsdale olympic weights these lonsdale olympic weights range from 25kg to 25kg olympic weights are a format of lifting product each end of an olympic bar is 50mm 2 inches diameter and olympic weights have a hole in the centre of each disc of just over 50mm 2 inches diameter that enable it to be used on olympic bars lonsdale also offer the standard weights which are standard bars at 254mm 1 inch thick and standard weights have a hole in the centre of each disc of just over 254mm