Once I've made one of my rim conversions and customer asked me about getting as small
clearance as possible. So he get 3mm and few weeks later he resend it to make it more cuz hes swingarm was grinded by the tyre. 8-10 mm is a minimum since then.
Srk, you will grind the swingarm with the setup you have made and no doubt of it - I can even bet.
8mm comes out to .315" so just a tad over 5/16" so real close to 1/4" my point about the tire growth is very close.
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