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Re: Belts 9mm or 15mm?
Not all belts are equal, FWIW. If you're looking at HTD profile (what VexPro and AndyMark sell) I would recommend 15mm for drivetrain. If you're running GT2/GT3 belts and pulleys, 9mm could be sufficient.
I believe 971 ran 9mm GT2 in 2013 and 2014, but switched to 15mm in 2015.
9mm can definitely work, but 15mm gives you a lot more headroom.
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