There is also a stiffness issue when you reduce the spoke count, which a tyre cannot address
Although 46mm tyres on a 20mm rim are going to squirm about so much you won't notice that the rim is moving from side to side too :-)
@gbj_tester started
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Although 46mm tyres on a 20mm rim are going to squirm about so much you won't notice that the rim is moving from side to side too :-)