FYI there is almost an 1.25" difference in tire diameter between a 305/30-20 and a 305/35-20 tire.
A 305/30-20's overall diameter is 27.2" whereas a 305/35-20's overall diameter is 28.4". That's a substantial difference and could potentially throw off other things. Plus it's basically 5/8" or 15MM to 16MM extra sidewall height.
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