Changing tyre sizes

Submitted: Wednesday, Apr 09, 2008 at 15:32
ThreadID: 56472 Views:2259 Replies:7 FollowUps:8
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I currently have 255/70 16 tyres at the moment and need to replace them. I would prefer to go to a LT tyre but in this size I'm very limited in LT's. Coopers have one but its has a lower load rating so can't use it.

It has been suggested to me to go up to 265/70 16 as there is a greater range to choose from, but from what I understand it will put the speedo out by 1.8%. I was wondering whether this is a common approach to getting a better choice of tyre or if I should just stay with my original size so as it wont effect speed but also the trip meter.
Any suggestion appreciated

Cheers Dave
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Reply By: Member - Oldplodder (QLD) - Wednesday, Apr 09, 2008 at 15:56

Wednesday, Apr 09, 2008 at 15:56
Don't know if I would be worried about 1.8% difference.

1. The speedo is most probably already out that much anyway.
They normally underead by up to 5% anyway. If you are worried borrow a GPS or use the kilometre markers on the side of the road to do a check.

2. That about 10 to 12mm difference, the difference between full depth tread and low tread? So tricky question, :o), how often do you change your tyres now to negate the tread wear? :o0

If you can get a wider range, and the same if not cheaper price, suggest go for it.
AnswerID: 297595

Reply By: Member -Signman - Wednesday, Apr 09, 2008 at 16:12

Wednesday, Apr 09, 2008 at 16:12
1.8% is stuff all- when considering the standard speedo error anyway.
You'd probably get more than that error between under inflated & over inflated tyres.....
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Reply By: Member - Davoe (Yalgoo) - Wednesday, Apr 09, 2008 at 16:19

Wednesday, Apr 09, 2008 at 16:19
255x70 and even 265x70 are in the main just glorified car tyres which is shown by how many come in a 10 ply rating.
If theyll fit without rubbing put on either 265x75 or 235x85 if they do rub.
those low profile tyres are just for better bitumen handling. As for speedo being out. check it with your GPS then adjust your driving to suit
AnswerID: 297600

Reply By: Member - David P (VIC) - Wednesday, Apr 09, 2008 at 16:41

Wednesday, Apr 09, 2008 at 16:41
nearly all vehicles on the road at 100 INDICATED are fact only dooing 95 GS so now you will be doing 96.8...thats better...silverback
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Follow Up By: Rock Ape - Wednesday, Apr 09, 2008 at 19:40

Wednesday, Apr 09, 2008 at 19:40
Thats a good way to send a couple of $s to the local cops.
Speedos vary a hell of a lot , some are slow and some are fast.
One of my vehicles is 10% fast and one is closer to 7% slow and one is nearly correct.



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Reply By: Shaker - Wednesday, Apr 09, 2008 at 17:00

Wednesday, Apr 09, 2008 at 17:00
If you are insured ... stick to the sizes on your tyre placard.
AnswerID: 297605

Follow Up By: itsdave - Wednesday, Apr 09, 2008 at 17:46

Wednesday, Apr 09, 2008 at 17:46
The 265/70 16 is within the legal parameters

Cheers Dave
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Reply By: Andrea11 - Wednesday, Apr 09, 2008 at 17:46

Wednesday, Apr 09, 2008 at 17:46
Hello itsdave

purely from a fuel consumption point of view *Wink Wink* I believe it will add more ltrs/100

Andrea
AnswerID: 297617

Reply By: Member - Phil G (SA) - Wednesday, Apr 09, 2008 at 17:57

Wednesday, Apr 09, 2008 at 17:57
255/70R16 is an unusual size. What vehicle?

If you want a 265/70R16, then one of the few LT tyres in that size are the BFG ATKO.

If you want muddies or a strong tyre with a load index of 120, then theres plenty available in 245/75R16.
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Follow Up By: itsdave - Wednesday, Apr 09, 2008 at 18:03

Wednesday, Apr 09, 2008 at 18:03
It's a D40 Navara. I wasn't aware of the BFG being a LT

Thanks Dave
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Follow Up By: Member - Phil G (SA) - Wednesday, Apr 09, 2008 at 19:02

Wednesday, Apr 09, 2008 at 19:02
Gday Dave,
BFG in that size have always been LT, and in the past they were the only one. But Bridgestone, Maxxis and Pirelli I think have LTs available. Out of that lot, I'd only consider the BFG and Bridgestone.
Bridgestone's new D694 and the BFGATKO both have a very good load index of 117 (most are 112) in LT265/70.

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Follow Up By: itsdave - Wednesday, Apr 09, 2008 at 19:45

Wednesday, Apr 09, 2008 at 19:45
Thanks Phil
I've been looking at the Bridgestone D694 LT and that was why I was asking about the larger tyre size as they are not available in the 255/70R 16. size. Bridgestone have them on special til the end of the month for $279(not a bad price). Just didn't know how the size change would effect things.

Cheers Dave
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Follow Up By: Member - Phil G (SA) - Wednesday, Apr 09, 2008 at 19:46

Wednesday, Apr 09, 2008 at 19:46
And if you want to use 245/75R16,
They are same diameter as 265/70, available in almost any tread pattern, come in the old 10ply rating, are a bit cheaper, and have a load index of 120. They will fit up fine on the D40's 7 inch wide rims.
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Follow Up By: itsdave - Wednesday, Apr 09, 2008 at 19:49

Wednesday, Apr 09, 2008 at 19:49
Thanks
Another option to look at

Dave
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Follow Up By: Member - Phil G (SA) - Wednesday, Apr 09, 2008 at 19:51

Wednesday, Apr 09, 2008 at 19:51
Dave,
The bridgestone 255/70 is not LT construction and load index is only 111.
I reckon you'd probably get the LT265/70 for the same money and it will be a much stronger tyre (LI = 117).
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