Prado tyres - Dunlop AT20 265/65.R17 vs BFG 265/70.R17

Submitted: Monday, Jul 26, 2004 at 13:56
ThreadID: 15023 Views:11770 Replies:6 FollowUps:5
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I'm considering 265/70.R17 AT BFG's to replace the 265/65.R17 AT20's and was wondering if there is much of a speedo change and if I need to recal the speedo ??

Regards
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Reply By: jazzdog - Monday, Jul 26, 2004 at 14:02

Monday, Jul 26, 2004 at 14:02
mate that's just silly
AnswerID: 69707

Reply By: Banjo - Monday, Jul 26, 2004 at 14:24

Monday, Jul 26, 2004 at 14:24
BTW.......what do the BF's cost in that size ?
AnswerID: 69710

Follow Up By: PK4444 - Monday, Jul 26, 2004 at 14:37

Monday, Jul 26, 2004 at 14:37
They're @ $285 per tyre fitted including 10K rotates / balances for the lifetime
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Follow Up By: Banjo - Monday, Jul 26, 2004 at 15:11

Monday, Jul 26, 2004 at 15:11
Very reasonable (....in BFG terms that is :-)
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Reply By: RainMaker - Monday, Jul 26, 2004 at 16:55

Monday, Jul 26, 2004 at 16:55
PK,

Try this site
http://www.miata.net/garage/tirecalc.html

Regards
AnswerID: 69726

Follow Up By: PK4444 - Monday, Jul 26, 2004 at 17:54

Monday, Jul 26, 2004 at 17:54
Thankyou for a very handy & intelligent answer, greatly appreciated!
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Follow Up By: PK4444 - Wednesday, Jul 28, 2004 at 14:10

Wednesday, Jul 28, 2004 at 14:10
A work mate later came up with this site, it also shows good old inch sizes etc...

http://www.1010tires.com/TireSizeCalculator.asp?action=submit

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Reply By: ginga - Monday, Jul 26, 2004 at 18:37

Monday, Jul 26, 2004 at 18:37
Once you have checked the overall diameter of your oversize tyres, check that they are legal (a potential insurance 'claim' problem)!

In New South Wales: The overall diameter of alternative tyres must be not more than 15mm larger than the largest O.E. size or 15mm smaller than the smallest O.E. size. Minimum speed rating is N (140 kph).

Something you should be aware of.

I run 265/75R16 Cooper ST's on a VZJ95R - it's worth the potential trouble.

Good luck in whatever you do.
AnswerID: 69740

Follow Up By: Member - Ivan (ACT) - Monday, Jul 26, 2004 at 19:18

Monday, Jul 26, 2004 at 19:18
I went from 265/70 R16 on my 90 series Prado, to 265/75s

On originals, at 100Kph (on speedo) was 96.5 on GPS

On 75s, 100Kph on speedo was 99.5 on GPS (ie, more accurate)

As far as being legal, they are not, and will almost definitely cause a problem with both the RTA and your insurance company... The best way around this (because at the end of the day, it's a stupid technicality), is to get an Engineer's Certificate - mine cost $280

Everyone now happy ;-)
Cheers,

Ivan
2008 D4D Prado

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Reply By: DrewT - Tuesday, Jul 27, 2004 at 10:12

Tuesday, Jul 27, 2004 at 10:12
Hi. I recently changed from the AT20s over to Cooper LT AT 265/70/17. From my calculations I thought the speedo would be a fair bit out, on a recent trip my GPS consistently showed I was travelling 4kph greater than the speedo. Hence not worth the effort/cost of changing the speedo ... just remember the difference!!
AnswerID: 69841

Reply By: Outnabout David (SA) - Tuesday, Jul 27, 2004 at 10:28

Tuesday, Jul 27, 2004 at 10:28
PK,

On my old 95 series the increase in size made the speedo correct but on the 120series the speedo is out by 3-5KPH depending on speed. Just be aware of the speed difference espicially in states where there is little tolerance to speed infractions. Just ask Muddy Doe!
AnswerID: 69844

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