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Old 19 May 2019, 04:43   #1
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Tyre pressure

Iím sorry to ask such a stupid question but im really not sure what pressure I should be running the trailer tyres at!

Itís a twin wheel trailer
Boat + trailer and sundries = 2000kg
13Ē rims
Tyre wall says max psi is 65

Any suggestions?
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Old 19 May 2019, 04:53   #2
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Go with the 65psi tyres are only run lower on cars for comfort and even tyre wear neiter are much of a concern on a trailer keeping the flex out of the tyre helps them run cooler
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Old 19 May 2019, 05:43   #3
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I go 37 on mine so it doesn't shake the crap out of the trailer.
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Old 19 May 2019, 07:01   #4
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I go 45 on mine
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Old 19 May 2019, 07:46   #5
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65 on mine twin wheel
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Old 19 May 2019, 08:27   #6
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60 on my twin axle
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Old 19 May 2019, 13:41   #7
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Thanks for that everyone
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Old 19 May 2019, 16:22   #8
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Have a look at this link, scroll down till you get to the tyre pressure bit

Trailer & Towing info - mods to make sticky!
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Old 20 May 2019, 06:40   #9
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I go 85-90 PSI with 195/60/12 Maxxmiler tyres on 5 x 6.5" rim so not very relevant but it show the range of options.
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Old 20 May 2019, 09:04   #10
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mine states 360kg at 70 psi
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Old 20 May 2019, 12:22   #11
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Trailer manufacturers tend to spec tyres to the trailer load and not much more. Simple economics dictate that smaller lower rated tyres are cheaper the tyres achieve their max rating at max psi so unless your trailer is significantly over rated for the load then tyres should be close to the max stated on the sidewall
Running lower pressure means more flex in the sidewall causing heat and eventually failure
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Old 20 May 2019, 17:11   #12
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Quote:
Originally Posted by beamishken View Post
Trailer manufacturers tend to spec tyres to the trailer load and not much more. Simple economics dictate that smaller lower rated tyres are cheaper the tyres achieve their max rating at max psi so unless your trailer is significantly over rated for the load then tyres should be close to the max stated on the sidewall
Running lower pressure means more flex in the sidewall causing heat and eventually failure
Most manufacturers spec boat trailer tyres with heavy duty truck tyres this side of the pond, anyone who has cheap Chinese types on their rig should consider ditching them for light truck tyres.
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Old 20 May 2019, 17:20   #13
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Quote:
Originally Posted by jonp View Post
Most manufacturers spec boat trailer tyres with heavy duty truck tyres this side of the pond, anyone who has cheap Chinese types on their rig should consider ditching them for light truck tyres.
But the majority of us who are not in Auz have trailers manufactured where the tyres are matched to the rated load. Not many if any European trailer manufacturers overspec trailer wheels and tyres hence most of us need to keep the pressures close to those printed on the sidewalls
Even premium brand tyres will fail if under inflated not just chinese tyres
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