I was right, woop! umm I'd say go for 28, but only cos i don't know the inner diameter of your rim. measure that and that will help a bit.
16.56mm near the bottom and 18.54 near the rim, digital calipers... boo yeah... i hate my life of model making.
@lemondragonfly started
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16.56mm near the bottom and 18.54 near the rim, digital calipers... boo yeah... i hate my life of model making.