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Why are garages so lazy over tyre pressure?

  • rogerzilla
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27 Sep 2023 07:09 #251031 by rogerzilla
Tyre pressure is important, ok?  So why do "professional" fitters nearly always whack 35-40psi into every tyre they fit?  It's not exactly difficult to find the label inside the driver's door.  Same goes for dealers - every tyre on the Jimny had 41-42psi in it and it was an even jigglier test drive than I expected.

Do they assume no-one will check the pressure between services (possibly valid), so they put in "extra"?  Or do they just not care?  A Jimny with over 40psi in each tyre isn't even safe - grip is quite compromised.

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27 Sep 2023 07:36 #251032 by Soeley
One theory I heard was that they are over inflated at the factory for shipping/transport reasons. But they should be set to the correct pressure during the PDI at the dealership. Mine had 40psi in when I collected it.

Makes you wonder how much else they skip on the PDI and just tick all the boxes?

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27 Sep 2023 09:06 - 27 Sep 2023 09:08 #251034 by yakuza
Because you get the best balancing when the tyre is at full pressure. most likely to get positioned correct on the rim at the highest pressure too.
You will get the most thread life from highest possible pressure as stated on the tyre, but not comfy.

Edit: Not sure of english law on this but here the driver is allways fully responsible for the technical state of the vehicle. Something most drivers is not at all capable of considering :D

Norway 2005 Jimny M16A VVT, 235 BFG MT, 2" Trailmaster, ARB rear lck, 17%/87% high/low gears.
Last edit: 27 Sep 2023 09:08 by yakuza.

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27 Sep 2023 09:35 - 27 Sep 2023 09:39 #251038 by Scimike
Same here in UK, driver is responsible for everything. One reason we will never get true "driver less" vehicles, the manufacturer's will need to accept liability for everything.
But back to tyres. I remember the day when every garage had wall charts with the correct pressure or the fitter would ask you after installation what pressure you wanted. My local garage still does, but most just inflate to anything over 35 psi, " it's about correct ". For most vehicles it's close enough, it's highlighted on the Jimny as it has lower than average pressure set by the manufacturer. The cynic in me also believes higher pressures also keeps those pesky TPS warnings off the dashboard so they don't get the driver back a few days after fitting a new tyre

Yokohama Geolanders, Sony head unit, NAUTILUS Air Horn, DRL conversion, Rear cargo space, Elvis Bobblehead, transfer Guard, Indian hanging Elephant, Koni Heavy track dampers, Custom SS exhaust, Voodoo Doll, Adventure Rack with LED ight bar, vintage ERIBA caravan usually attached (yes it's slow)
Last edit: 27 Sep 2023 09:39 by Scimike.

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27 Sep 2023 12:16 #251042 by DrRobin
Why, because it takes a little longer to set the correct pressure (different front and back on some cars) and they are getting paid to do the job, not the time it takes.

So, after you get a car back check them with an accurate gauge and set it yourself. Remember to check and set pressures 'cold' i.e. left for a few hours otherwise it won't be accurate.

2020 blue SZ5 (one of the last to be registered in the UK)
Ex 2011 Blue Jimny SZ4
Northumberland Jimny Blog

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27 Sep 2023 14:36 #251044 by jlines
I think because on the average car or 4x4 you wouldn’t  know the difference where as a Jimny is very sensitive to changes in pressure. 

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  • rogerzilla
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27 Sep 2023 14:51 #251046 by rogerzilla
Replied by rogerzilla on topic Why are garages so lazy over tyre pressure?
And wheel balance, which they did get spot on.  No more steering vibration at all.

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