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@BrickMan
great links thanks! that poly v belt looks like a bit of a monster. prob will be the plastic of the rollers is only 2-3mm so even cutting a 1mm channel is going to srriously reduce their syrength.
at work we have a few addiditive layer plastic printers so might just whack a belt drive sptokcet of 4" out so that the tacx belt will fit. :)