tires

Submitted: Wednesday, Jul 27, 2005 at 16:58
ThreadID: 25106 Views:2383 Replies:5 FollowUps:6
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G'Day,

I have a prado 120 V6 5speed Manual. Along with other mods allready undertaken, it has now come time to swap the oem 265/65R17 (776mm diameter) Grantrecks to something more robust. I would like to upgrade in size a little aswell, 275/70R17 (818mm diamter) to be exact.

I have spoken to several owners who have upgrades in sizes from 265/70R17s to 285/70R17 (fitted to oem rim and two inch suspension lift only) and all seem very happy with their choices.

My question is would a modest upgrade in size from 776mm diamter to 818mm diamter (as mentioned above) justify modifications to diff ratios to suit this tire or should be ok?.. not sure if I should to be on the safe side.

thanx


Nick
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Reply By: DRM (Vic) - Wednesday, Jul 27, 2005 at 22:14

Wednesday, Jul 27, 2005 at 22:14
Nick,

I fitted cooper at's (great tyres) 275/70/17 to my v6 auto prado. travelled 20k km and still looking great.

you would be safe / not need to modify anything mechanical other than your awareness that the slight increase in rolling diameter will make the speedo reading slightly negative.ie.100kph reading the real actual speed as measured with my GPS is around 108kph (at 60kph difference is only a few kph..

trust this helps

AnswerID: 122420

Follow Up By: ndamico - Sunday, Jul 31, 2005 at 11:08

Sunday, Jul 31, 2005 at 11:08
thanx for the replys... ok i have just decided on cooper atr 275's. However, what about spare wheel?.. any mounting issues or effects on door with extra weight?...

thanx

Nick

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FollowupID: 378105

Reply By: Wizard1 - Thursday, Jul 28, 2005 at 09:09

Thursday, Jul 28, 2005 at 09:09
In Australia we call the TYRES not tires.......
AnswerID: 122484

Follow Up By: Leroy - Thursday, Jul 28, 2005 at 09:25

Thursday, Jul 28, 2005 at 09:25
I really don't know why you bother replying to any posts. All you seem to do is criticise others. Maybe he's a Yank!! But you didn't think of that did you?

Leroy
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FollowupID: 377651

Follow Up By: Gerhardp1 - Thursday, Jul 28, 2005 at 11:15

Thursday, Jul 28, 2005 at 11:15
A yank he may be but one should never tire of their tyre choice. Hell, why not call it a tier.

I'm pretty sure that if one of us went to the US and started beavering around we would be corrected promptly.
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FollowupID: 377669

Follow Up By: Leroy - Thursday, Jul 28, 2005 at 14:13

Thursday, Jul 28, 2005 at 14:13
A tier is something different altogether.

color - colour
favourite - favorite
www.coopertires.com.au

I think you'll get the drift.....
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FollowupID: 377705

Follow Up By: Gerhardp1 - Thursday, Jul 28, 2005 at 15:24

Thursday, Jul 28, 2005 at 15:24
To tire is also quite (not quiet) different from driving on a tyre.

I merely threw in tier because it can be pronounced the same way as tire and tyre. I know it's different altogether, just as different as tyre and tire.
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FollowupID: 377725

Reply By: Outnabout David (SA) - Thursday, Jul 28, 2005 at 10:07

Thursday, Jul 28, 2005 at 10:07
Nick,

You have a V6 petrol witrh plenty of power so you won't notice much of a difference. Just be aware of the speedo. I went away with Simon from the Yahoo list with 34" swampers and he didn't seem to have a problem.
AnswerID: 122499

Reply By: Charcoal RS - Thursday, Jul 28, 2005 at 13:56

Thursday, Jul 28, 2005 at 13:56
I have 275/70/17 BFG ATs on my Prado and they look pretty tight. Can you really fit 285s to a Prado, I have OME suspension on mine??

Cheers

Jeff
AnswerID: 122542

Follow Up By: ndamico - Thursday, Jul 28, 2005 at 15:02

Thursday, Jul 28, 2005 at 15:02
Jeff, I have spoken to a guy on two occasions just to confirm that he is using bfg AT 285/70R17 and he also confirmed using the oem rim. I have not viewed the vehicle in front of me though this is what he said. I asked if it rubs upper control arm o the front suspension he said no probs. I personally would check that out myself before installation though. It is the Cooper ATR or ST's in 275/70R17 that I am interested in though. It is all legal in NSW isn't it?..

Oh and thankyou for all your replies, much appreciated.

Nick
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FollowupID: 377721

Reply By: prado_95 - Saturday, Aug 06, 2005 at 19:13

Saturday, Aug 06, 2005 at 19:13
The ECU uses the speedo input for some calcs, but this should not be an issue on a manual gearbox.

The biggest issue will be remembering that the speed is now reading slow (ie you are going faster than the speedo says), which may lead to getting done for excess speed by up to about 7%.

Of course anybody else who drives the car needs to know this too (specially the missus!).

Fitting some thing like Speedo-matic might help save some licence points and penalty $$.
AnswerID: 124112

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