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Thin Whitewalls...... tyre sizes????

Posted: Tue Mar 23, 2010 10:27 pm
by samprinci
hi all, I know this question has been asked b 4, but just wanted to double check....

looking at getting white walls for ute. I believe the better Tyre size is the 185/80/13, because its the closest to the original ply Tyre spec????

but any feed back on the 185/70/13 ?????? I understand the sizes & in theory the smaller side wall makes the engine work harder on freeways??? but is this true???? its just coz the 185/70/13s r $100 cheaper???? but I would rather pay the extra for not working motor hard on freeway, but is that really true????


TA
Sam

Posted: Tue Mar 23, 2010 11:16 pm
by Cal
I had the same issue, and ended up going for the 80's. If your'e running a stock diff ratio the 70's will make the car rev a fair bit higher.

Posted: Wed Mar 24, 2010 3:52 am
by Trev
From 185/80/13 down to 185/70/13
So when your speedo reads 70mph, you're actually travelling at 65.84mph
Nearly 6% slower, there for your engine would have to work 6% harder to do the same speed as the 80 series tyre

Posted: Wed Mar 24, 2010 1:04 pm
by Devilrod
Trev's got it in one, didn't realize he was a mathematician!!

The taller the tyre the less RPM you pull. In simpler terms. :lol: :lol:

Posted: Wed Mar 24, 2010 9:31 pm
by samprinci
great, thanks fellarz... it was the answer I was looking for. thanks a million... I just checked my tyres on the EJ.. 185/75/13.... I always wondered why my speedometer was out???? DOH!.....:oops: :oops: :oops: .so thanks Trev, u r a mathematician!!!
:wink: :wink:

It all makes sence now. getting the 185/80 for sure.

thanks again fellarz, I really appreciate the help....

Posted: Thu Mar 25, 2010 3:51 am
by Trev
Check out the tyre size site Blacky made a sticky at the top of this section :wink: .
And would it hurt you to say thanks Sam? :lol: :lol: :lol:

Posted: Thu Mar 25, 2010 12:04 pm
by samprinci
Trev wrote:And would it hurt you to say thanks Sam? :lol: :lol: :lol:
Sorry, what DA???????????? I said thanks about 5 times!!!!

Posted: Thu Mar 25, 2010 12:26 pm
by Stygian
samprinci wrote:
Trev wrote:And would it hurt you to say thanks Sam? :lol: :lol: :lol:
Sorry, what DA???????????? I said thanks about 5 times!!!!
That's what I think Trev is gently teasing you about Sam :)