I just want to confirm that your after 235/85/16? Because that size (27") is like a low profile tyre on a 16" wheel
If it was a 235/75x16 then it would be smaller..What? So what is a 265/75/16? I was under the impression they were a 31"?? So a 235 would be smaller, no?
Actually "modern" tyre sizes are a bastardised mix of metric and imerialRIGHTO then! I get it know, i though it was 285 was some sort of stupid measurement for the height! Tyres sizes are the one of the very few Metric measurements I HATE! Along with pressure, prefer PSI in mechanical applications (ie tyres, boost, hydrolics and pneumatics) any day of the week.
GU.GT. thanks for the info. The extra diff clearance is the significant factor for me.Duggy, The 235 x 80x 16 which was standard on my DX is very similar in diameter to the also standard 265x70 on a lot of others. The effect of changing to 235x85 is indeed to raise your overall gearing very slightly and to give about 12mm extra ground clearance under your diffs. The change in tyres would also cause your speedo to read approximately 3% slow, perhaps a problem if your speedo is accurate. However, in my case the speedo was reading fast and the tyres corrected it.
With regard to fuel consumption, I've not noticed a significant change either way.
You may have already read this, but if not it's worth the read; Expeditions West: Tire Selection for Expedition Travel
This is an interesting read, i didn't relise the benefits of narrowers tyres, i have 285/75/16 and was thinking of going back to 265/75/16 mainly for gearing, but now i can see there is other benefits.