206mm The size of many turntables from the 70's and 80's. All belt driven machines and pioneers. Also works on Toshiba, Onkyo and Kenwood. that I have tried myself. I suspect most of them use the same 200mm drive ring, so this size is the most versatile. 150mm works on substrates of all projects and music halls. It's possible, but the belt directly from the manufacturer is about 10 times more expensive, but why? They want $25 for a belt.
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