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@kerley
That tyre looks huge or is it just the photo? Looks more like you will be going down hilling!
And yes 62GI is too high (but you knew that!), I am using 57GI off road on the fast routes in my area and I average just under 17mph and guessing you won't be doing that with those downhill tyres :-)
Think I used to use around 52GI on MTBs which is what made them so bloody frustrating on any road sections...