Too high tire pressure can cause body vibration?

[RigerZ]

Recently I exchanged cars with my mother for me to use in KL, Proton Wira with 185/60 R14 tires (or maybe its 195/50/R15, not too sure but its either one of these). When driving between 80-90kph, I can feel the car vibrate quite noticably through the pedals and the seat. When I took it to our regular shop, they said its because my tire pressures are too high (32psi).

When they brought it down to 30psi and I tested, the vibrations went away. I know 32psi is quite high (wanna save petrol ) but can too much psi really cause body vibrations? Quite curious to know how it relates...

 

[dkny]

High pressure in tyre reduce comfort ride, as the tyre too rigid.
Normal recommendation pressure(most of the car) should be around 30-32psi (200~220 kpa), and I don't see any high pressure here.
Normally vibration during high speed cause by few factor,
1. Alignment
2. Camber
3. Tyre Balacing
4. Tyre tread uneven wear
5. Other

 

[RigerZ]

80-90 isnt really high speed is it? and Btw above 90kph no vibrations....

 

[vr2turbo]

Recently I exchanged cars with my mother for me to use in KL, Proton Wira with 185/60 R14 tires (or maybe its 195/50/R15, not too sure but its either one of these). When driving between 80-90kph, I can feel the car vibrate quite noticably through the pedals and the seat. When I took it to our regular shop, they said its because my tire pressures are too high (32psi).

When they brought it down to 30psi and I tested, the vibrations went away. I know 32psi is quite high (wanna save petrol ) but can too much psi really cause body vibrations? Quite curious to know how it relates...

32psi is quite normal pressure only, in fact depending on tyre/car type recommended pressure is from 30 to 36psi. Anything over 36psi then can consider a bit on the high side.
Usually high pressure will cause bumpy feeling and should not be vibration.

 

[Izso]

I'm thinking his rims are dented somehow. Too much pressure and the vibration is too obvious, then reduced pressure, since soft sidewall and lower pressure, vibrations not so obvious? These are pretty high profile tyres (the 185/60/14)

 

[Supra_Fanatics]

Time to send for alignment and balancing check.

 

[C99D-MMC5537]

For me it looks like the tyre already have a minor swell @ bengkak. More pressure will makes the swell more obvious.

 

[vr2turbo]

Time to send for alignment and balancing check.

But he already send for check, and all they did was release some air, 2psi only and that is what I usually increase if use on highway.....:hmmmm:

---------- Post added at 02:25 PM ---------- 6 hour anti-bump limit - Previous post was at 02:25 PM ----------

For me it looks like the tyre already have a minor swell @ bengkak. More pressure will makes the swell more obvious.

Dented rims still okay, if tyre swell better check proper.....

 

[Supra_Fanatics]

But he already send for check, and all they did was release some air, 2psi only and that is what I usually increase if use on highway.....:hmmmm:

---------- Post added at 02:25 PM ---------- 6 hour anti-bump limit - Previous post was at 02:25 PM ----------



Dented rims still okay, if tyre swell better check proper.....

ya I usually increase 2 psi more than recommended.

 

[twistedichc]

heck I'm running 35psi on 165/60/R14 still ok but mine is small car the fish oni maybe that's y.

 

[RigerZ]

alignment was done, balancing was done twice, i strongly dont think rim bengkok because the car never went through deep potholes. tires are new and no sidewall bulging.

 

[vr2turbo]

heck I'm running 35psi on 165/60/R14 still ok but mine is small car the fish oni maybe that's y.

Well, the smaller the air space the more the air pressure needed to hold the tyre in place.
For example bicycle tyres needs 50psi, my 215/45R17 needs at least 33psi, but my SUV 235/60R16 only need 30psi.....

 

[stupidcar]

I once used 44psi for awhile(months). HAHAH

 

[ken yeang]

is the tyre approaching its expiry date?

 

[dkny]

Tyre don't have expiry date, only have warranty period.

 

[C99D-MMC5537]

My advise is, we should have our own pressure gauge. Some petrol station pump reading not reliable. Last week fill my tyre at shell petrol station. Set the pump at 35psi. After finish pump I will double check the pressure using my own pressure gauge at it show almost 40psi.

 

[RigerZ]

Tyre don't have expiry date, only have warranty period.

Ithimk he meant if the tires are too old. Mine are 2013 tires

 

[jerrysiow]

Tyre don't have expiry date, only have warranty period.

Dude, everything got it owns expiry date include human. What the sifu asking is the manufacturer date. Just want to know whether the tyre is still healthy and not that old.

Change your tyre = "Current date" Minus "Manufacturer date"** > 5 years

**Manufacturer date shows at tyre [2111] translate as the 21 weeks of year 2011 hence the tyre's age is 3years and 4 months up-to-date.

 

[vr2turbo]

is the tyre approaching its expiry date?

According to him still new....

---------- Post added at 11:45 AM ---------- 6 hour anti-bump limit - Previous post was at 11:45 AM ----------

Ithimk he meant if the tires are too old. Mine are 2013 tires

Oh! you replied here....

---------- Post added at 11:47 AM ---------- 6 hour anti-bump limit - Previous post was at 11:45 AM ----------

My advise is, we should have our own pressure gauge. Some petrol station pump reading not reliable. Last week fill my tyre at shell petrol station. Set the pump at 35psi. After finish pump I will double check the pressure using my own pressure gauge at it show almost 40psi.

Digital pump? So far I tried a few Petron ones they are accurate, but the analog ones are not...

---------- Post added at 11:50 AM ---------- 6 hour anti-bump limit - Previous post was at 11:47 AM ----------

Dude, everything got it owns expiry date include human. What the sifu asking is the manufacturer date. Just want to know whether the tyre is still healthy and not that old.

Change your tyre = "Current date" Minus "Manufacturer date"** > 5 years

**Manufacturer date shows at tyre [2110] translate as the 21 weeks of year 2011 hence the tyre's age is 3years and 4 months up-to-date.

Yup, whether we call it warranty date or expiry date, the tyre still have a lifespan of about 5 years only from manufacturing date. I just changed my SUV tyre date 2009, now 2014. Pattern still have about 40% but fine crack lines already appearing on the sidewall, rubber also have harden....

 

[dkny]

Toyo & Michelin warranty period = 6 years
Other brand = 5 years

So any tyre after the period not able to made warranty claim, but doesn't mean the tyre cannot use.
It depend on tyre condition, imagine why some car their tyre still have so many RTD(remain tread depth) after 5 year, because they selfdom use on the road. That the main reason why tyre rubber crack on tread/sidewall.