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@rpm
colm, mdcc_tester,
The reason people generally warn off heavier riders from using 20c clinchers is because of a perceived chance of pushing the tyre off the bead when jumping at extreme angles in steep turns. This is generally an American opinion, and they do have some steeper outdoor tracks than we do in the British isles.
It could just as easily be another old wives tale, but there's not many reasons not to rather be safe than sorry and there's no measurable performance benefits in sprint events from having a 20c over a 22c. It's probably not even that expensive to get a new fork which takes a 23c compared to the cost of good tyres these days.