305-50-20...will it fit on SRT Goliath rim 20x9
Um, specs for a 305/50r20 General Grabber AT2 show it to be 32"x 12.4" and fit on rims from 8.5" - 11" wide.
I have no idea if this will fit well based on the proposed wheels, but lots of us are running a 32" tire on stock WK2s as it is the largest size that typically fits without a lift or other modification.
Yes, the speedo will be off 5%. Basically you'll be about 3mph faster when the speedo reads 65mph.
Do note that you must refer to the actual tire specs for sizes as they will vary between brands and models. As an example, a Yokohoma in that same size is speced as 32.4". In addition, the specs will denote what wheel widths are supported.
All in all, a fair number of folks here are running 32" tires. Mine are 32"x11" on stock wheels. General consensus is 32" will fit in most cases and the more you go above that the more likely you'll rub.
That said, note those are pretty wide and that will increase the odds they will rub.
My guess is you'll clear the control arm without difficulty (I clear it with an 11" tire and stock offset), but you might rub.
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Current: '14 WK2 Overland,V8,ORAII,Tech
Past: '99 WJ Laredo V8,ORAII(QD,TowIV,skid)