A few days ago I used 12-15psi on tubed 7.50s on standard rims with no issues, and have been doing similarly for nearly fifty years. Those who think you need 'safety' bead retainer rims (especially with tubes) are ignoring the fact that these were safely used for fifty years and are still widely used. Yes, they add a margin of safety, but the margin is only a small one, only significant when the driver is engaging in extreme side loads with abnormally low tyre pressures.
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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