Funnily enough, just checked my own plaque and it shows 20" and 21" details.
However it actually states:
20"
Max 3 persons F240 (34psi) / R240 (34psi)
21"
Max 3 persons F250 (36psi) / R250 (36psi)
20" and 21"
Max 5 persons + luggage F270 (39psi) / R320 (46psi)
The interesting thing is that unless you have a full load, the recommend the same front and rear.
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