Cooper 255/85/R16 S/T's

Submitted: Wednesday, Jul 13, 2005 at 10:38
ThreadID: 24678 Views:6570 Replies:8 FollowUps:6
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Hi all,
I just have a quick question; can anyone see any major problems with putting 255/85/R16’s on the Paj? Other that it throwing the Speedo Out a little more? And that it may not be totally Legal to do it! The reason I ask is that I had 265/75/R16’s on and I wanted to put 285/75/R16 on but I’m only running 7” rims (CSA’s) so they wont fit. The guys at Richards Tyerpower said that I can fit 255/85/R16 on 7’ Rims and that they’ll be taller which is the whole point of this exercise. Oh and that there an S/T as apposed to the A/T’s on there at the moment one last thing is that it’s not a tyre size that I have heard being talked about a lot.

Any comments would be appreciated.

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Reply By: Leroy - Wednesday, Jul 13, 2005 at 11:01

Wednesday, Jul 13, 2005 at 11:01
I like to use more common sizes incase I need to get another in a hurry. Also I have the same size as friends incase we need to borrow a spare.

AnswerID: 120120

Reply By: Member - Bradley- Wednesday, Jul 13, 2005 at 11:26

Wednesday, Jul 13, 2005 at 11:26
Its not a real common size, so i wouldnt go it.

Apart from the 105 % overgearing plus higher rolling resistance which will slow the rig down a fair bit.

I went up 106% on the jackaroo and it made a big difference to the gearing, slowed it down heaps.

Personally i'd stick with the 265/75/16 you would be hard up not to be able to get one easily anywhere.
AnswerID: 120122

Reply By: Member - Captain (WA) - Wednesday, Jul 13, 2005 at 11:48

Wednesday, Jul 13, 2005 at 11:48
Hi Matt,

I looked at the Cooper 255/85R16 for my GU Patrol but eventually opted for the 285's. I wanted the ~33" size, a much better performer offroad IMHO, but didn't necessarily want the 285 width. My ideal tyre is a 10.5" (265 width) and 33" diameter, which as you have found you cannot get in 16" diameter. The 255 width looked a bit narrow for the Patrol hence why I went the 285. But I reckon they should be fine on a Paj.

As for keeping to 265/75 for spares compatability, while it is a valid argument, how many time have you actually had to do this. Also, if I was stuck, I would put a 285 tyre on a 265 shod vehicle or vice versa to get me going. Not ideal, but hey, better than being stuck.

I reckon choose the tyres you want for what you need, not for some small probability of needing to be compataible, who knows who you will be with when you need it.

Richards TyrePower in Osborne Park would have to rate at one of the best tyre shops in Perth IMHO. I have been using them for years and would recommend them to anyone. While they have arguably the best wheel balancing equipment in Perth, its there great after sales service that is icing on the cake (and No, I have no relationship with them other than being a satisfied customer).


AnswerID: 120123

Follow Up By: Matt (W.A.) - Wednesday, Jul 13, 2005 at 12:43

Wednesday, Jul 13, 2005 at 12:43
Cheers Captain,
I recon you’re Right I’ll take all the precautions humanly Possible, the Spare will be a 255/85/R16 too and tyre puncture repair kit and an inner tube or 2 for when we go away on long trips that’s all I can do if I want the taller tyre or I Buy 8’ rims as well! But the money tree won’t stretch that far at the moment…..better to be prepared as much as possible than not at all. Hell we had to pull a 4 Day old GU of the beach up at the Alkimos last Friday they had been there for 2½ hours bogged because they didn’t so much as have a shovel with them!!
I too agree about Richards Tyrepower I have bought the last 2 sets of tyres for The Paj there and the Wife’s Astra, I was told about them by Word of mouth which is always the way to go. The after sales service is great! I too have nothin to do with them and stand to gain nothing from them its j.m.o.o.!

FollowupID: 375170

Reply By: Disco200Tdi - Wednesday, Jul 13, 2005 at 14:29

Wednesday, Jul 13, 2005 at 14:29

I run this size tyre on a Tdi disco as my road/outback tyre. It is an excellent width to height ratio and fits within the guards well.
BFG also do this size in a mud terrain. I do find I use more fuel to push these tyres but for my use its worth it.
I have just returned from a simpson desert trip and found these tyres performed very well with only minor chipping.


John D
AnswerID: 120144

Follow Up By: Member - John C (QLD) - Wednesday, Jul 13, 2005 at 20:33

Wednesday, Jul 13, 2005 at 20:33
With the fuel economy, sure you have allowed for the overgearing with the bigger tyres.
If you have gone up 5% tyre size, your odometer will be out 5%.
i.e. reading 95k instead of 100k, which at 10l/100k is 0.5l/100k.

Happened to me on my pajero going to 235/85/16 :-)
FollowupID: 375268

Reply By: Andy C - Thursday, Jul 14, 2005 at 00:06

Thursday, Jul 14, 2005 at 00:06

I'm with all the other followers of Richards in Osb Pk!

Go have a look at - "tech" and then "tire size calculator". I've thrown your choices in there and by going the 255/85 you'll get a lift of 31mm (and thats also under the diffs!). You will get some 8% error in your speedo and same in gearing.

I went from a Coopers 235/70/16 AT (6" rims) to a Coopers 265/75/16 ATR LT (7" rims) on my Navara. 9% speedo error and change to gearing. Great tyres so far but early days! The speedo is now just about correct and reading 100kph when I'm doing 97.5kph on the GPS. Gearing - well, takes a bit more to get off from the lights but haven't yet gone out to get dirty in low. My therory was always a max 10% loss in gearing was acceptable to me and my use of the vehicle. When you're doing a decent at 5kph and the gearing changes that to 5.5kph, I really don't have a problem with that in my manual Navara!

Also look at the DPI web site on wheel/tyre mods - my interpretation is that in WA from memory and without an inspection;

1. Can't go over 7" rims
2. Tyre profile must be within guards/flares
3. Tyres must clear all body work under all driving conditions

Easy as that (will make the eastern states guys and gals throw up hey!).

Get in touch if you need some help!

AnswerID: 120276

Follow Up By: Matt (W.A.) - Thursday, Jul 14, 2005 at 09:12

Thursday, Jul 14, 2005 at 09:12
Thanks for the really great reply you have made my mind up for me. It’s at Richard’s as we speak. Like you I use my GPS to tell me my true speed as well so ill just have to work out the Error/Difference and adjust accordingly. I’m not here to break any land speed records so that won't be an issue. But I will have to give the old girl a few more herbs in the boggy stuff I expect and carry an extra Jerry of fuel! But hey thems the breaks for having more height.

Thanks Andy and to everyone who replied your input has been greatly appreciated once again.


P.S. I’ll update my Members Pic’s when I get her back thisarvo.
FollowupID: 375335

Reply By: Andy C - Thursday, Jul 14, 2005 at 17:15

Thursday, Jul 14, 2005 at 17:15
No Problems Matt! Look forward to the new pics.

Look after those low down trailer electrics! I had ARB move mine into the rear bumper so it wouldn't get ripped off - they just drilled a hole and presto - out of the way for good!

AnswerID: 120367

Reply By: Andy C - Thursday, Jul 14, 2005 at 19:52

Thursday, Jul 14, 2005 at 19:52

You've obviously picked her up!

Parked on the verge of Richards when I went by an hour ago and now missing!

How does she run? Speedo error etc?

AnswerID: 120400

Follow Up By: Matt (W.A.) - Thursday, Jul 14, 2005 at 23:20

Thursday, Jul 14, 2005 at 23:20
Hey Andy,
How did you recognize her????? Ha Ha.
She runs really well no rubs at full lock which is great considering there Outside Diameter is 844mm and the 285/75/R16 are only 833mm she sits noticeably higher and the Speedo at 100Km/h runs at 104Km/h and just a tad noisier nothing the Exhaust doesn’t drown out! I would highly recommend that tyre size to any one. Will have to wait and see how they go in the dirt and a few suspension travel testers will let you know. Thanks again for your help.

FollowupID: 375498

Follow Up By: Matt (W.A.) - Friday, Jul 15, 2005 at 19:16

Friday, Jul 15, 2005 at 19:16
Check out My Rig Pics, loaded them just now there she is with her new shoes on what do you recon?

FollowupID: 375628

Reply By: Andy C - Friday, Jul 15, 2005 at 20:01

Friday, Jul 15, 2005 at 20:01
Well done Matt!

Hope you're happy with the new set-up!

Just got the Navara back from Giant's for the 15K service! I'm on the CSR in 4 weeks time so I went the 20K service that does a bit more! Ended up with a box of spares and the cost wasn't unbearable! (that's where I was heading when I saw your Paj at Richards yesterday!).

I have a good level of comfort now for our big trip - going cruise control on tuesday as i'll be doing some 4,000 ks on the black on my own.

AnswerID: 120545

Follow Up By: Matt (W.A.) - Saturday, Jul 16, 2005 at 10:03

Saturday, Jul 16, 2005 at 10:03
Cheers Andy
Enjoy the CSR you lucky Bugger! Hope the Cruise Controll Install goes Smoothley? you'll have to let me know how the Navara Performs. I'm keen to find out may be looking at a Change.......................

FollowupID: 375707

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