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It's pretty simple math...
(width x sidewall height percentage x 2 / 25.4) + rim dia
(295 x .50 x 2 / 25.4) +15 = 26.6" for your old tires
(315 x .35 x 2 / 25.4) + 17 = 25.7" for the new ones
The actual height will be a little different, but not much.
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Mike Lackey
'68 C10
'49 6400
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