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Old 14 July 2012, 05:48   #1
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Tyre pressure

Does anyone know what my tyre pressure should be on my boat trailer ? I'm towing a 4m searider with a 45hp Mariner 2stroke outboard.
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Old 14 July 2012, 06:34   #2
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I started at 30psi, if it bounces about too much let some air out, If it looks too flat put a bit more in, I don't think there are any set pressures like you get with cars, you just experiment to find what's best for you'd set up.
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Old 14 July 2012, 06:35   #3
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I would say 25lb should do, you don't want them to hard because that'll make your trailer to bouncy.
ps, I would love to hear you doing a radio check with the Coast guard, there gonna love your call sign,
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Old 14 July 2012, 08:46   #4
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ps, I would love to hear you doing a radio check with the Coast guard, there gonna love your call sign,
Brilliant, Just Brilliant.
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Old 14 July 2012, 12:13   #5
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Just watch though .. there will be a maximum pressure on the side of the tyre bear in mind it will increase when the tyre naturally heats up with use
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Old 14 July 2012, 13:06   #6
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Standard tyre pressures here: Trailer & Towing info


But I reckon you'll be running 4.00 x 8, 5.00 x 10, 5.20 x 10 or 145R10 on a small RIB?


If so, here's some tyre pressures for smaller wheels and tyres (as Bigmuz7 states, the cold max tyre pressure will be on the side of the tyre wall):


4.00 x 8" 4 ply = 60psi
4.00 x 8" 6 ply = 75psi
4.00 x 8" 8 ply = 86psi


5.00 x 10" 6 ply = 50psi
5.00 x 10" 8 ply = 65psi


5.20 x 10" 4ply = 32psi


145 R10 std = 42psi
145 R10 8 ply = 65psi


Whilst it's tempting to drop some pressure out, to eliminate bouncing, don't do too much - under inflated tyres will wear quicker, heat up due to additional friction (ergo may heat bearings and disperse grease) and will effect your fuel economy. Hope that helps.


PS. +1 on the name
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Old 14 July 2012, 13:18   #7
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Tyre pressure

Much obliged for the replies folks

ps do you think I should change my call sign
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Old 14 July 2012, 13:21   #8
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Is it best then Trailer Guy to just inflate the tyres to the psi stated on the tyre and leave it at that, being as the maximum pressure stated is cold.
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Old 14 July 2012, 13:39   #9
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Much obliged for the replies folks

ps do you think I should change my call sign

Yea "Kiss Ass"
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Old 14 July 2012, 13:45   #10
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Tyre pressure

Now thats got to take some licking
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