D is the Maximum you can run on stock rims. Max pressure is 65 lbs, can not remember but I did find that spec on a OEM site. Lions head site is vague on what the rims are good for. Most here run 55 to 65 on D on the Flagstaff/Rockwood stock rims. Also use metal valve stems but I still Rubber myself with no air loss or other problems.
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B and B
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