Play around with this tyre size calculator, put your original size in the first window & alternative size in the next. It will tell you differences in rolling diameter & speedo reading.
I got rid of my 20" rims which had 265/50/20 on for kmc monsters with nitto terra grapplers 285/60/18 love them and not that noisy either, now just some flares needed.
I bought a 2nd hand set of 18's with tyres for my trips offroad and swap between them and the 20's. My 20's will always have good road tyres only and the 18's will be solely used offroad (and to get there and back...lol)
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MY12 WK2 Overland CRD in Mineral Grey
Outlaw 4x4 diesel chip
3" exhaust
CSA Raptors
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2006 Jeep WH Grand Cherokee
Sargent Gutsy
SOLD 06 Limited G/C QuadraDrive II Lovells 2"Lift +30 rims 265/70/17 Imported Saguaro Bar Stedi
Grand Cherokee Overland 5.7, Uneek Bullbar, Ironman winch
