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Old 8th March 2008, 08:50   #1
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Question Correct Tyre pressure after upsize

Guys,

My PALIO SLX 1.1 came with 165/80 R13 Tubeless tyres. I drove down straight to the tyre shop and got an upgrade to 185/65 R14 tyres - Michilen Energy XM1. The tyre dealer recommended 30 psi. I found the ride to be a bit bumpy and reduced to 28, which was pretty comfortable. I am also getting a milage of 14+ in city with 50% A/C

When I went in for the second free service at 7500 kms, the service advisor for Manipal Motors told me that 25 psi is the ideal pressure for my tyres. So I asked them to set it at 25 psi as I was getting the tyres rotated. I find a marked increase in drive comfort. Not yet checked the milage.

My question is, what is the correct pressure for my config. I do not want to compromise on milage by more that 1 KMPL and more importantly I do not want to increase tread wear.

Please advise.

Cheers,
Rajan
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Old 8th March 2008, 13:53   #2
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Go down by 3-2 psi from the stock tyre recommendation Psi for your upsized tyre. This will be close to company suggested Psi for the new size.

Now you can go further down by another 2 Psi without compromising on the wear part, again this is a very personal choice so i suggest you play around for the ideal choice for your taste.

Keep in mind to adjust the pressure at a good place with digital gauge and stick to the same place while correcting pressure. Also drive around for 2-3 days to figure out the real difference.
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Old 3rd July 2009, 11:55   #3
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I've also got the tyre upgrade to my Palio D and has got the same question!!

I have upgraded it to 195/60R14. I used to keep 30 for all four tyres and has set the same for the new size for few days now.
Palio D is a bit heavier than other versions and I have observed that the fornt tyres may need a bit more pressure as it has got the heavy engine at front.
Does it make sense to keep different pressure for front and rear tyres?
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Old 3rd July 2009, 12:13   #4
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Ketan, congrats on your new tyres? which brand?
Did you get the alloys too?

I maintain 32 for front, 30 for back tyres of my Palio. The ride is good!
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Old 3rd July 2009, 16:04   #5
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Default Thanks for the info

Finally a thread that answers some questions of mine. I run 195/55 R15s on my 1.6 and was trying to get the right pressures. I have been trying same pressure all around - between 28 & 32. Thanks to the info on this thread, I am now going to try different pressures on the front & back.

Cheers,
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Old 3rd July 2009, 23:23   #6
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I upgraded to Yokohama A539 175/60 R13 Tubeless from Bridgestone S322 155/70 R13 Tube type on Santro Xing.

Yokohama suggests 30 psi as the ideal pressure. The ride is a bit bumpy sometimes, please suggest an ideal pressure.

Thanks
Warm Regards
Tanveer Singh
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Old 3rd July 2009, 23:26   #7
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Quote:
Originally Posted by tsk13 View Post
I upgraded to Yokohama A539 175/60 R13 Tubeless from Bridgestone S322 155/70 R13 Tube type on Santro Xing.

Yokohama suggests 30 psi as the ideal pressure. The ride is a bit bumpy sometimes, please suggest an ideal pressure.

Thanks
Warm Regards
Tanveer Singh
Quote:
Originally Posted by Jaggu
this is a very personal choice so i suggest you play around for the ideal choice for your taste.

Keep in mind to adjust the pressure at a good place with digital gauge and stick to the same place while correcting pressure. Also drive around for 2-3 days to figure out the real difference.
Read the above posts...
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Old 3rd July 2009, 23:52   #8
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Thanks Nikhil. Will try the same, hope for the best.
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Old 12th July 2009, 16:46   #9
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I got 29psi air filled in my 175/60 Yokohama A539 on Santro and the ride has improved.

Thanks to Nikhil and Jaggu.

By the way, is it possible that the Air pressure might increase on its own?
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Old 13th July 2009, 00:23   #10
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Yes tsk13 air pressure would increase due to heat build up. Go in for Nitrogen instead,as being an inert gas it does not absorb heat, due to which there is no expansion to cause pressure variation.
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Old 13th July 2009, 00:29   #11
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Quote:
Originally Posted by PatchyBoy View Post
My question is, what is the correct pressure for my config. I do not want to compromise on milage by more that 1 KMPL and more importantly I do not want to increase tread wear.
28 psi is perfect for 185/65-14 in Palios. You can also try + 2 psi for your highway drives.
25 psi is way too less.
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Old 13th July 2009, 00:38   #12
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Quote:
Originally Posted by WasavaTyres View Post
Yes tsk13 air pressure would increase due to heat build up. Go in for Nitrogen instead,as being an inert gas it does not absorb heat, due to which there is no expansion to cause pressure variation.
Thanks WasavaTyres for answering the query and for your valid suggestion. Well, the problem is that in Delhi we have extremely limited guys who have Nitrogen facilities, the nearest and only known being 8.5 kms away from home.

Someone told me that if I go for Nitrogen, then I have to refill it with Nitrogen only and not normal air. Therefore I avoid getting it done. By the way, how long does Nitrogen last under normal conditions and is it advisable to go for normal air after nitrogen.

Thanks and Regards
Tanveer Singh
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Old 13th July 2009, 01:21   #13
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It's a myth that you cannot top up with normal air. If you're nowhere near a N2 filling station you can always top up with normal air. N2 would go for about 3 months before you need to check your tyre pressure. And the normal air top up to your N2 filled tyres won't do any harm as over 78% of atmospheric air is nitrogen it's just that N2 in it's pure form is devoid of other gases (heat absorption) and moisture (rusty rims)
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Old 13th July 2009, 09:46   #14
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Quote:
Originally Posted by WasavaTyres View Post
It's a myth that you cannot top up with normal air. If you're nowhere near a N2 filling station you can always top up with normal air. N2 would go for about 3 months before you need to check your tyre pressure. And the normal air top up to your N2 filled tyres won't do any harm as over 78% of atmospheric air is nitrogen it's just that N2 in it's pure form is devoid of other gases (heat absorption) and moisture (rusty rims)
I agree with this absolutely. You can top up with normal air if needed. By the way, in my Civic, the pressure lasted at the same level for over 9 months after filling Nitrogen. Perhaps it is the alloy and tyre combination.

Whereas in the i10 with the pressed metal wheels, the pressure came down by 4 psi in just 2 months before I changed the wheels last weekend.
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Old 13th July 2009, 12:30   #15
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Thanks WasavaTyres and Naresh. I'm having alloys with Yokohama A539 175/60 R13, so hope it should last longer. Will get it filled when I get to visit that place.
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