265/75/16 & loss of power - D40 Navara?

I have a D40 Navara TD manual and am looking at replacing the factory tyres with some decent AT's. Factory size is 255/70/16, ideally want to fit 265/75/16's to get LT construction, but the increase in size is approx 40mm larger in diametre.

Interested to know what sort of power loss im likely to get by going to this size? the other option is to fit 265/70/16s which are only a 13mm increase in dia and will bring the speedo in line with actual speed...but not LT contruction for off-road.

Please let me know what experience you have had?

Cheers,

It shouldnt make a huge difference I dont think

If you intend doing any towing probably not a good idea to go much larger at all, I'd baulk at 265/75x16's if towing was at all being considered.

BFG AT's come in LT for 265/70x16s check here


this is handy tyre calculator

or maybe consider Coopers 245/75x16 I'll probably go these in 75series next time around.

cya
Graham

bigger tyres

i have 267/75 BFGs on my auto D40 and the now the speedo is spot on and the power differance is not noticable. i also tow a 2 1/2 ton boat no problems.

Wish my Navara had 400nm of torque.

Shouldn't cause much issues.

Dave.

bob said:

i have 267/75 BFGs on my auto D40 and the now the speedo is spot on and the power differance is not noticable. i also tow a 2 1/2 ton boat no problems.

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Hi Bob,

Did you fit them before or after fitting the DP chip and Beaudesert Exhausts system? Have heard that you need to fit a chip and exhaust to get the power back with the bigger tyres....but dont have the cash right now, and dont want to suffer major power loss until i can afford to do chip/exhaust.

Cheers,

265/75/16

had them fitted after the chip and before the exhaust.
it takes about 2 minitues to remove the chip and without the chip you would not tell the differance between the tyres, i have evan thought about going to 285/75/16 the only reason so far is QLD laws. after the vehicle devalues a bit more i might not worry so much about insurance and just get them anyway

I think the difference with bigger tyres is sweet F*ck all.

Hi, you cant loose any power by changing tyre size but rather a decrease in acceleration. What is lost iin acceleration is gained by a drop of rev's at cruising speeds saving you fuel, l(less the increase in tyre frontal area) and your speedo will read accurate as D40 are geared for 265/75 tyres.

its factory size in US no difference. its what they should have from factory.

owen1200 said:

PS: Since you are in Brisbane you will no doubt know that QLD Transport will only allow a 15mm increase in rolling diameter, thus making 265x75x16 tyres illegal in your state? Possibly impacting on your insurance if you cause a crash?

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yep that sux being in QLD. 265/70/16 best u cant go with 0.5mm to spare lol