Recommended PSI

[Versatile]

Hi Guys,

 

Can i know what's the recommended PSI for 17"? for front and rear?

 

I'm on Bridgestone Potenza RE-01R (215/45/R17).

 

Thanks.

[Redplanet]

38 psi for me...

[Versatile]

For both front and rear?

[Redplanet]

For me, yes. Though there are others who prefer pumping slightly more for the front. But most ppl will pump 32 to 33psi. So it's my own preference @ 38psi.

Edited April 13, 2010 by Redplanet

[Versatile]

For me, yes. Though there are others who prefer pumping slightly more for the front.

 

Thanks once again. So 38 is the recommended PSI for both front and rear? Anyway does petrol stations tire pump machine show PSI reading or other terms of reading? Sorry for such a ignorance question as this is the first time pumping tire as i feel car jerk especially on 2nd gear after changing to 17" tire.

 

Btw, i'm using stock 185/65R15 previously.

Edited April 13, 2010 by Versatile

[0_Kewl]

Hi Guys,

 

Can i know what's the recommended PSI for 17"? for front and rear?

 

I'm on Bridgestone Potenza RE-01R (215/45/R17).

 

Thanks.

 

Depends on what car you drive, how many people and/or luggage, and how fast you're travelling. There is a recommended inflation pressure for your specific vehicle (actually, there's probably 2 sets...1 for normal driving and the other for high speed / high load). You just need to locate it. What car are you driving?

 

Check out my FaceBook page...'White Circles'...i'm drafting a topic specifically on proper inflation pressure. Each week i try to cover in depth 1 tyre related topic.

[Versatile]

Depends on what car you drive, how many people and/or luggage, and how fast you're travelling. There is a recommended inflation pressure for your specific vehicle (actually, there's probably 2 sets...1 for normal driving and the other for high speed / high load). You just need to locate it. What car are you driving?

 

Check out my FaceBook page...'White Circles'...i'm drafting a topic specifically on proper inflation pressure. Each week i try to cover in depth 1 tyre related topic.

 

Hi i'm driving a hyundai avante. Normally, beside me and myself.. there will there be not much pple sitting in my car. I've not much stuffs behind my boot except some wash car stuffs. My normal travel speed is 120km/hr max.

[0_Kewl]

Hi i'm driving a hyundai avante. Normally, beside me and myself.. there will there be not much pple sitting in my car. I've not much stuffs behind my boot except some wash car stuffs. My normal travel speed is 120km/hr max.

 

Hmm...that's probably why. Hyundai if i'm not wrong, is one of the few vehicle manufacturers that don't have a tyre pressure placard pasted or located anywhere in/on the vehicle. The owners manual definitely will state though, so go refer to that. Having said that, owners manual may not state the recommended pressure for your upsized 17" equivalent.

 

When you upsize, it is important to note the load index of your OE tyre spec vis-a-vis your new upsized tyre. If the load index on your new tyre is the same or higher, then you're ok to follow the pressure recommendations as the OE tyre. Its only if your upsized tyre has a lower load index than the OE tyre that you have to compensate with additional pressure.

 

Again, tune in to my FB page. I'll cover what's defined as 'regular driving' inflation pressure versus 'high load / high speed' inflation pressure, correct pressure for upsized tyres, etc.

[Redplanet]

Thanks once again. So 38 is the recommended PSI for both front and rear? Anyway does petrol stations tire pump machine show PSI reading or other terms of reading? Sorry for such a ignorance question as this is the first time pumping tire as i feel car jerk especially on 2nd gear after changing to 17" tire.

 

Btw, i'm using stock 185/65R15 previously.

 

either in kpag or psi.

 

 

[Versatile]

Hmm...that's probably why. Hyundai if i'm not wrong, is one of the few vehicle manufacturers that don't have a tyre pressure placard pasted or located anywhere in/on the vehicle. The owners manual definitely will state though, so go refer to that. Having said that, owners manual may not state the recommended pressure for your upsized 17" equivalent.

 

When you upsize, it is important to note the load index of your OE tyre spec vis-a-vis your new upsized tyre. If the load index on your new tyre is the same or higher, then you're ok to follow the pressure recommendations as the OE tyre. Its only if your upsized tyre has a lower load index than the OE tyre that you have to compensate with additional pressure.

 

Again, tune in to my FB page. I'll cover what's defined as 'regular driving' inflation pressure versus 'high load / high speed' inflation pressure, correct pressure for upsized tyres, etc.

 

Sorry but these terms are very very hard to understand. However, i will try to catch/understand what you mean.

 

Anyway, the default PSI that came with the rim is 31-32. I've pumped to 38 PSI as per recommended by RedPlanet. I'm pretty worried whether is it good or bad to pump in 38 PSI.

 

Will it decrease the tire's performance? As i do some hard cornering at times, will there be any side effect?

[Redlavita]

found this PSI to Kpa converter webby, hope it helps

 

http://www.csgnetwork.com/presskpapsicvt.html

[0_Kewl]

Sorry but these terms are very very hard to understand. However, i will try to catch/understand what you mean.

 

Anyway, the default PSI that came with the rim is 31-32. I've pumped to 38 PSI as per recommended by RedPlanet. I'm pretty worried whether is it good or bad to pump in 38 PSI.

 

Will it decrease the tire's performance? As i do some hard cornering at times, will there be any side effect?

 

Do NOT pump at 38psi just because RedPlanet said that he's using 38psi! Good god! He/she is a f-ing wanker to just say 38 works for him. 38 might be ok for him but what vehicle is he driving and what size tyres does he have?! Its not all the same you know? If I was driving a Lamborghini Gallardo, my recommended pressures would be 44psi. A Porsche Cayman S is 29psi (front) & 36 psi (rear). A Toyota Camry is 32psi.

 

Look in your vehicle owners manual. It will tell you how much to pump. Based on my data, the recommended pressure for the old Avante is 32psi...i think.

 

Now when you have your recommended pressure (which is 'cold' pressure), you will most probably drive to the petrol station to top up yes? Once you get there, you will need to add an additional 3-4psi (equivalent in kpa is 25kpa). Why? This is to compensate for expansion of air in your tyres due to heat buildup from driving to the pump. Trust me. If you want to know why, check in to White Circles for a detailed explanation...it'll be up this week or next.

Edited April 14, 2010 by 0_Kewl

[Xdeatel]

Do NOT pump at 38psi just because RedPlanet said that he's using 38psi! Good god! He/she is a f-ing wanker to just say 38 works for him. 38 might be ok for him but what vehicle is he driving and what size tyres does he have?! Its not all the same you know?

 

Look in your vehicle owners manual. It will tell you how much to pump.

 

Now when you have your recommended pressure (which is 'cold' pressure), you will most probably drive to the petrol station to top up yes? Once you get there, you will need to add an additional 3-4psi (equivalent in kpa is 25kpa). Why? This is to compensate for expansion of air in your tyres due to heat buildup from driving to the pump. Trust me. If you want to know why, check in to White Circles for a detailed explanation...it'll be up this week or next.

 

This.

 

Refer to your owners manual.

 

If i am not wrong, theres a link somewhere that explains why different cars with same tyre will have different PSI. Hmm can someone post it here to educate forumers?

[0_Kewl]

If i am not wrong, theres a link somewhere that explains why different cars with same tyre will have different PSI. Hmm can someone post it here to educate forumers?

 

My guess, and i'm no expert since i'm not a vehicle manufacturer nor an engineer, is that it probably has to do with suspension geometry & vehicle weight. I would imagine a lightweight Lotus would have very different ideal pressure versus say a Rolls Royce Phantom.

[Versatile]

Do NOT pump at 38psi just because RedPlanet said that he's using 38psi! Good god! He/she is a f-ing wanker to just say 38 works for him. 38 might be ok for him but what vehicle is he driving and what size tyres does he have?! Its not all the same you know? If I was driving a Lamborghini Gallardo, my recommended pressures would be 44psi. A Porsche Cayman S is 29psi (front) & 36 psi (rear). A Toyota Camry is 32psi.

 

Look in your vehicle owners manual. It will tell you how much to pump. Based on my data, the recommended pressure for the old Avante is 32psi...i think.

 

Now when you have your recommended pressure (which is 'cold' pressure), you will most probably drive to the petrol station to top up yes? Once you get there, you will need to add an additional 3-4psi (equivalent in kpa is 25kpa). Why? This is to compensate for expansion of air in your tyres due to heat buildup from driving to the pump. Trust me. If you want to know why, check in to White Circles for a detailed explanation...it'll be up this week or next.

 

Thanks for the advise. Will probably pump to 34 PSI instead. And will be looking forward to the white circles for more detailed explanation.

 

However, curious thing is hyundai did not paste any recommended tyre pressure at the driver's seat area. The sticker there show recommended pressure for 15" and 16" only.

 

[Kwchan]

My engine is located nearer to the driver side so the right side is always sinks lower as it is heavier.

 

It is worse when the driver is on the right too.

 

May be it was designed for left hand drive so the designer probably expecting the driver to be on the left to counter balance.

 

In that case, shall I pump more on the right since the load is higher?

[Donut]

mine is 205/45/16, recommended PSI is 34

 

so yrs is 17", should be 36 to 38 lor.......

[0_Kewl]

mine is 205/45/16, recommended PSI is 34

 

so yrs is 17", should be 36 to 38 lor.......

 

You cannot use this rationale. You need to compare load index. What is your load index for your 205/45 R16? If the 17's that you upsize to has the same or higher load index, then you use the same recommended pressure as the 205/45 R16. If the load index on the 17's is less, then, and only then, do you need to compensate with higher pressure, all else being equal.

Edited April 14, 2010 by 0_Kewl