Which country are you in?It is entirely possible to get the Silent Runner in the majority of the world,even outside the UK or US
Rodipet sell the Silent Runner,although their dimensions are not accurate.They list the largest as a 29 cm wheel which is not true as it is a 12 inch or 30.48 cm wheel.The Silent Runner is an investment but it is long lasting with superior quality to any other wheel on the market,as well as being the absolute safest wheel on the market(no open wheel can compare,and even the other enclosed wheels on the market barely come even slightly close to the perfection that is the Silent Runner).