currently running 255/55/20 on my 2011 4.4 looking to change to AT3s (had 275/40/20 on my 07 3.6) anyone know what the biggest size i can fit is ?

id like a taller side wall AT3s available in various sizes - 255/60/20, approx 2" taller same width, 275/60/20 approx 3" taller 0.8" wider

anyone fitted anything in these sizes? or know the limits?

Andy 1972 Series 3 full of character
1985 90 pick up went anywhere
1992 90 Exported
2007 L322 that was an experience
2010 D4 more versatile than a Swiss army knife, now gone
2011 L322 4.4 VSE traded in
2018 L405 4.4 VSE

I got some rubbing on the arch liner at the front on my 255/55 R20 when a height sensor failed and it dropped to the bumpstops so I'd worry about going any larger as it may become undrivable in such an instance. I was just able to drive a short distance to a safe place at a slow speed. 2012 TDV8 Vogue (L322)

When I bought mine last September these where fitted.
WHEELS:
GCP Daytona, steel 20 INCH, black gloss with some very light optical damage. 5 pieces. Size 9, diameter 20, PCD 5x120, ET 30, bolt pattern 72.6.
Fits multiple Land Rover models and years. Defender, Discovery, Range Rover. These GCP Daytona steel rims are designed to accommodate the original 18" Land Rover hub caps and wheel nuts/bolts of the new Defender.

TIRES:
RADAR Renegade R/T+ LT285/60R20 MS POR. DOT JAJ J80M6 production: 2423. Load and speed index: 121/116Q. 5 pieces, of which 1 unused tire with tread depth 1.2cm. Tread depth other tires is 1.15 to 1.1cm.

The combination of rims and tyres made it necessary to make cutt offs in the inner plastic wheel arches, but they sometimes touched it with wear trough, damaging the water spray fluid hose. We fixed it with an alloy plate. Bottom line ... It still touched in some occasions what was annoying and made me decide to place another combo.

I'm driving around with no issues for a few months now - MAK Birmingham 20" alloy rims with Yokohama Geolander M/T LT 275/55R20 tyres.


Comparison / step in height setting:
 2012 RR 4.4 TDV8 Vogue, '86 Bombardier Iltis type 183 ex mil, '71 Hercules K125 BW ex mil.
Earlier owned: '79 Chevrolet Caprice Classic, '86 Land rover 90.