I've just spent 2 days thinking about tyres. Stock size tyres are good if you have stock size rims. It's all very difficult when you have different widths and diameters and you can't work out which wheels to put on which bike.
I'm just going to suck it and see!
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mc18 F3, mc21 300, mc21ish sp, mc21/28ish.
cbr929, RC30, tdr250, rvf400, wave, gyro, joker.