Tyre pressure

[JaiLai]

Can anyone recommend tyre pressure for 275/55/20 on a 2013 Ford ranger ( won't be hauling much weight ).

TY

[funcat]

...did you ask the installer?...That will be the first thing I would do...

[mgjackson69]

I would start with the maximum pressure listed on the sidewall of the tire.

If that ride is too firm for your liking, reduce each tire by 2 PSI and try again.

But certainly more than the 32 PSI that Thais seem to think is the law.

[JaiLai]

Thanks for the replies, nowhere near the installer and would not really trust what he'd say anyway.

I will check he sidewall and take it from there. Where's the pressure on the tyre, near the sizes?

[mgjackson69]

There is a bunch of small 'print' on the sidewall, it will say "Maximum load xxxxx at xxxxx PSI"

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[Gsxrnz]

Jesus!!! RTFM!!

Edit: And basically with that low a profile, it doesn't really matter, it will ride like <deleted> anyway. Why people buy a 4-wheel drive and then but bicycle tyres on it has always been rather an amusement. Got a noisy exhaust to go with it by any chance?

[mgjackson69]

I have had various new light trucks over the years, and without fail I always found the pressures stated in the manual to provide too soft/bouncy of a ride, as well as making the handling less firm than I care for.

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[arthurwait]

If you start at maximum pressure as soon as you sit in the car or add more petrol you will be over maximum pressure.

[mgjackson69]

Gsxrnz, I missed that detail...in the case of aftermarket tires the manual means nothing.

And we are in 100% agreement on the low profile tires...you almost have to run them at or near max pressure to keep from bashing your expensive rims on the great roads found in most places. They will definitely give you a shitty ride.

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[Gsxrnz]

Gsxrnz, I missed that detail...in the case of aftermarket tires the manual means nothing.

And we are in 100% agreement on the low profile tires...you almost have to run them at or near max pressure to keep from bashing your expensive rims on the great roads found in most places. They will definitely give you a shitty ride.

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Yep, first pothole (translation: small swimming pool), and you've knackered your rim. And if you suddenly brake to save your rims, you'll be wearing a two scooters and a concrete truck up your jacksie. TIT

[mgjackson69]

If you start at maximum pressure as soon as you sit in the car or add more petrol you will be over maximum pressure.

The tires are designed to carry the max weight at max pressure. Putting the tires at max pressure, then adding 80kg of driver is going to increase the tire pressure by a negligible amount.

Also, the max pressure is rated with the tire cold...the manufacturers allow for air expansion aka pressure increase when the tie warms.

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[JaiLai]

Don't really think they're low profile myself but whatever.....

Everyone else - thanks

[noikrit]

No weight .. around 32 psi If you live around rough roads, thats nearly everywhere , try gaffer taping your sunnies on your head .... keeps em from bouncing off ...... Happy Rides !!

[JaiLai]

Jesus!!! RTFM!!

Edit: And basically with that low a profile, it doesn't really matter, it will ride like <deleted> anyway. Why people buy a 4-wheel drive and then but bicycle tyres on it has always been rather an amusement. Got a noisy exhaust to go with it by any chance?

This basically shows wot you know - SFA!! The ride is fine with 55 profiles.

I have another vehicle with 40's, now that is a rough ride ( not a truck though ).

[JaiLai]

No weight .. around 32 psi If you live around rough roads, thats nearly everywhere , try gaffer taping your sunnies on your head .... keeps em from bouncing off ...... Happy Rides !!

A sensible answer, thanks.

[transam]

Shall I begin..................

[Ace of Pop]

Shall I begin..................

O.K then,ive got the Week Off.

[Tywais]

Shall I begin..................

Your tire pressure radar seems to need calibration. Really now, 14 hours to reply here?

Inside the door should be a sticker with the recommended pressure unless this is a non-standard tire. You don't use the maximum pressure shown on the tire, that is the absolute maximum safe pressure without damaging the tire and puts you into a dangerous margin.

[Spoonman]

When I had the 20's on my Ranger (275/45/20) I had 34 in the front and 32 in the rear.

[transam]

Shall I begin..................

Your tire pressure radar seems to need calibration. Really now, 14 hours to reply here?

Inside the door should be a sticker with the recommended pressure unless this is a non-standard tire. You don't use the maximum pressure shown on the tire, that is the absolute maximum safe pressure without damaging the tire and puts you into a dangerous margin.

I thought it was a bad dream until I saw it here in B&W........................

[cornishcarlos]

Why are Farang so miserable when talking about tyre pressures ?

[transam]

Why are Farang so miserable when talking about tyre pressures ?

Perhaps because they don't like the advice given..................

[Jitar]

JaiLai, The load index of the replacement tyres should be similar or slightly higher than the OEM tyres. The Load index is probably around 110 - 115 and should be marked on the sidewall near the size. If the the load index is similar the inflation pressure should also be be similar to OEM. Most up market pick ups with car type tyres recommend around 30 - 36 psi. Commercial or LT tyres use higher pressure but your 20 inch tyres will not be these.

I have 275/55 x20's and the ride fine on around 30 - 34 psi. Higher pressure is really only needed when carrying heavy loads.

[David48]

Shall I begin..................

I believe the correct reply is 52 ... or is that 54 PSI ... I forget ...

[David48]

I run 36 - 40 as the higher pressure creates a better tyre profile, reduces drag and increases fuel economy.

Standard thinking is 32 PSI ... boring!

[transam]

I run 36 - 40 as the higher pressure creates a better tyre profile, reduces drag and increases fuel economy.

Standard thinking is 32 PSI ... boring!

And you like your excursions into the weeds too........................

[arthurwait]

Shall I begin..................

Your tire pressure radar seems to need calibration. Really now, 14 hours to reply here?

Inside the door should be a sticker with the recommended pressure unless this is a non-standard tire. You don't use the maximum pressure shown on the tire, that is the absolute maximum safe pressure without damaging the tire and puts you into a dangerous margin.

Is that how long it takes Viagra to wear off. Wife thinks it's safe to let him out now ?

[Mrjlh]

I run mine at 36 front and 34 rear. But 35 works also for all 4. Never more than 40 because you'll start loosing traction.

[David48]

I run 36 - 40 as the higher pressure creates a better tyre profile, reduces drag and increases fuel economy.

Standard thinking is 32 PSI ... boring!

And you like your excursions into the weeds too........................

I am serious ... but you know me ... I'm a frugal chappie!

But should one venture off road ... sand actually ... 12 - 16 PSI is the go because it adds more tyre surface area to contact the sand with ... the dry sand that is.

[mgjackson69]

I run my tires 6 - 8 PSI below the max, with a bit of adjustment up or down to suit the ride characteristics. Between Thailand and USA I have a Toyota PreRunner DoubleCab, a Chevrolet Silverado CrewCab 4x4, and a Jeep Wrangler. Each vehicle likes a different amount of departure from the maximum pressure. None of the vehicles has original equipment tires, so the manufacturer's recommendations are not really applicable.

I have never experienced any problems with rain traction running at or near max pressures. I do lower the Silverado by 3-4 PSI for winter driving. The Jeep I lower about the same amount, but I tend to run lower pressures on that one generally, due to the limited amount of highway driving.

I find the ride of my vehicles to be too soft and bouncy at the lower pressures. But that is a personal preference.

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