28mm. Not because 25 would be unsafe, but because if you can fit a 28mm why would you go any lower?
Hah actually scrap that, 25mm internal width. Right....
I'll start with 20mm and work up...
@hippy started
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28mm. Not because 25 would be unsafe, but because if you can fit a 28mm why would you go any lower?
Hah actually scrap that, 25mm internal width. Right....