Tyre size choice

Submitted: Tuesday, Oct 05, 2010 at 13:28

ThreadID: 81724 Views:3548 Replies:3 FollowUps:8

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Tyre Size Calculator

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rare

Hi I own a Toyota 100 series Lancruiser (IFS) which has road tyres 275/70/R16 fitted. I,m looking replace these with muddies. I dont really want to change the rims so my question is am I restricted to useing the same size replacement tyres.

Has anyone done something different?

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Reply By: Member - Tour Boy ( Bundy QLD) - Tuesday, Oct 05, 2010 at 14:07

Tuesday, Oct 05, 2010 at 14:07

Nope,
285/75/16 will fit no probs.

Cheers
Dave

Cheers,
Dave
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AnswerID: 432159

Reply By: Member - Tony V (NSW) - Tuesday, Oct 05, 2010 at 15:17

Tuesday, Oct 05, 2010 at 15:17

rare,

Just be aware that changing from 275/70/16 (31") to 285/75/16 (33") will put your speedo out 100kmh indicated will be approximately 106kmh on the road, may be illegal if you are in NSW (VSI 09).

That said I have a road set 31" with AT's and a set for trips 33" with mud tyres.
The GPS keeps the speed correct and it is highly unlikely that you will get pinged for tyre size.

AnswerID: 432163

Follow Up By: rare - Tuesday, Oct 05, 2010 at 16:28

Tuesday, Oct 05, 2010 at 16:28

Ok Thanks so the increased tyre size will result in an aprroximate 6% speedo difference. IE: Speedo = 100KLM real speed = 106KLM

FollowupID: 702982

Follow Up By: Member - Tony V (NSW) - Tuesday, Oct 05, 2010 at 17:27

Tuesday, Oct 05, 2010 at 17:27

Correct.

There is a tyre Tyre Calculator click here and a mass of other great information listed at the bottom of these pages under Asrticle Topics.

Also remember that Mud Tyres tend to be noisey..

Good luck with your tyre choice.

FollowupID: 702988

Follow Up By: David Jje - Tuesday, Oct 05, 2010 at 18:08

Tuesday, Oct 05, 2010 at 18:08

My 100 series with 285/75/R16 only showed a 2% increase.

FollowupID: 702992

Follow Up By: Member - Tony V (NSW) - Tuesday, Oct 05, 2010 at 19:52

Tuesday, Oct 05, 2010 at 19:52

David,

Check the tyre calculator it should be 5.1%.....

FollowupID: 702995

Follow Up By: Member - Alex K (NSW) - Tuesday, Oct 05, 2010 at 20:14

Tuesday, Oct 05, 2010 at 20:14

Depending on how accurate the speedo was originally will vary the result.

FollowupID: 703001

Follow Up By: Member - Tony V (NSW) - Tuesday, Oct 05, 2010 at 22:14

Tuesday, Oct 05, 2010 at 22:14

Alex,

The 5.1% difference between the 2 tyre sizes is a constant. i.e. 31" and 33" has a different rolling diameter of 5.1%

Speedo's will always vary, so will tyre brands and tyre different tyre pressures.

Not that it matters as long Rare knows that there will be a difference.

FollowupID: 703011

Follow Up By: Crackles - Tuesday, Oct 05, 2010 at 22:48

Tuesday, Oct 05, 2010 at 22:48

Fitting 285's actually corrects the speedo. All car speedo's by law indicate lower than actual speed so the larger tyre diameter (at least on my 105 series) brings it to within 1kmph of that displayed. (Compared with GPS)
What it does put out is your odometer which will indicate less KM's than actually travelled.
Cheers Craig.......................

FollowupID: 703019

Follow Up By: David Jje - Wednesday, Oct 06, 2010 at 05:37

Wednesday, Oct 06, 2010 at 05:37

Craig,
when i had the D694 tyres, i noticed that when tyres were at about 40%+ wear the gps and speedo matched. About 2% when new

FollowupID: 703029

Reply By: TD100GXL - Wednesday, Oct 06, 2010 at 01:15

Wednesday, Oct 06, 2010 at 01:15

I have my second set of 285 75 16 BFG A/T's on my IFS 100 series, they are a great fit and as mentioned by others they put the speedo out by about 5 k's.
Stuart

AnswerID: 432210