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14 July 2012, 10:48
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#1
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Member
Country: UK - England
Town: Sheffield
Boat name: Brenda Jean
Make: Avon Searider
Length: 4m +
Engine: Mariner 45hp 2stroke
Join Date: Oct 2008
Posts: 28
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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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14 July 2012, 11:34
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#2
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Member
Country: UK - England
Town: Sussex
Make: RIBTEC 655
Length: 6m +
Engine: Yam 150
Join Date: Oct 2007
Posts: 1,160
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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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14 July 2012, 11:35
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#3
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Member
Country: UK - Wales
Length: no boat
Join Date: Jan 2012
Posts: 1,012
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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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14 July 2012, 13:46
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#4
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Member
Country: UK - England
Town: Herne Bay
Boat name: Red May
Make: Zodiac
Length: 4m +
Engine: 40hp Honda 4 Stroke
MMSI: Is quite long
Join Date: Jun 2010
Posts: 653
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Quote:
Originally Posted by Dragonhawk ficht
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Brilliant, Just Brilliant.
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14 July 2012, 17:13
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#5
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Member
Country: UK - Scotland
Town: Glasgow
Boat name: stramash
Make: Tornado
Length: 5m +
Engine: Etec 90
Join Date: Feb 2006
Posts: 5,090
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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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14 July 2012, 18:06
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#6
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Member
Country: UK - England
Town: Hampshire
Boat name: Altea 2
Make: Narwhal
Length: 5m +
Engine: 90 Mariner
Join Date: Aug 2011
Posts: 855
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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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14 July 2012, 18:18
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#7
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Member
Country: UK - England
Town: Sheffield
Boat name: Brenda Jean
Make: Avon Searider
Length: 4m +
Engine: Mariner 45hp 2stroke
Join Date: Oct 2008
Posts: 28
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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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14 July 2012, 18:21
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#8
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Member
Country: UK - England
Town: Ashton-under-Lyne Lancs
Boat name: IMOGEN
Make: Air-Craft 5.4
Length: 5m +
Engine: Suzuki df70a
MMSI: 235087492
Join Date: May 2010
Posts: 7,078
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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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Member of S.A.B.S. (Lancashire Division)
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14 July 2012, 18:39
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#9
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Member
Country: UK - England
Town: Sheffield
Boat name: Touch Bottom
Make: Avon
Length: 4m +
Engine: 50 hp Merc Power t&t
Join Date: Jul 2008
Posts: 288
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Quote:
Originally Posted by cahooney
Much obliged for the replies folks
ps do you think I should change my call sign
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Yea "Kiss Ass"
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14 July 2012, 18:45
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#10
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Member
Country: UK - England
Town: Sheffield
Boat name: Brenda Jean
Make: Avon Searider
Length: 4m +
Engine: Mariner 45hp 2stroke
Join Date: Oct 2008
Posts: 28
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Tyre pressure
Now thats got to take some licking
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14 July 2012, 20:06
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#11
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Member
Country: UK - England
Town: Hampshire
Boat name: Altea 2
Make: Narwhal
Length: 5m +
Engine: 90 Mariner
Join Date: Aug 2011
Posts: 855
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Quote:
Originally Posted by kerny
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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Hi Kerny, it's what I do on every trailer service, providing the tyres are cold.
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14 July 2012, 20:08
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#12
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Member
Country: UK - England
Town: Ashton-under-Lyne Lancs
Boat name: IMOGEN
Make: Air-Craft 5.4
Length: 5m +
Engine: Suzuki df70a
MMSI: 235087492
Join Date: May 2010
Posts: 7,078
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Quote:
Originally Posted by Trailer Guy
Hi Kerny, it's what I do on every trailer service, providing the tyres are cold.
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Thanks TG I will stick to that then
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14 July 2012, 21:17
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#13
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Member
Country: UK - Scotland
Town: Glasgow
Boat name: stramash
Make: Tornado
Length: 5m +
Engine: Etec 90
Join Date: Feb 2006
Posts: 5,090
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Quote:
Originally Posted by kerny
Thanks TG I will stick to that then
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It depends what you are doing ... sometimes if you need to launch over a pebbly/rocky shore for example, having really hard tyres makes your boat jump about whilst you manouvre over them.
Personally I never inflate to maximum, full pressure is more likely to pick up punctures from debris IMO due to less ability to flex, and also removes some inherent suspension ability of the tyre its self. It also impairs road holding, and your trailer will behave differently with regards to drift etc. The sidewalls play quite an important part in this regard, and do the job less effectively if they are really stiff.
Everyone will have their own view ofcourse, having trailed many different types of trailers both at work and play, with a wide variety of loads, Ive concluded it just seems to work best this way
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14 July 2012, 21:22
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#14
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Member
Country: UK - England
Town: Ashton-under-Lyne Lancs
Boat name: IMOGEN
Make: Air-Craft 5.4
Length: 5m +
Engine: Suzuki df70a
MMSI: 235087492
Join Date: May 2010
Posts: 7,078
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Quote:
Originally Posted by Bigmuz7
It depends what you are doing ... sometimes if you need to launch over a pebbly/rocky shore for example, having really hard tyres makes your boat jump about whilst you manouvre over them.
Personally I never inflate to maximum, full pressure is more likely to pick up punctures from debris IMO due to less ability to flex, and also removes some inherent suspension ability of the tyre its self. It also impairs road holding, and your trailer will behave differently with regards to drift etc. The sidewalls play quite an important part in this regard, and do the job less effectively if they are really stiff.
Everyone will have their own view ofcourse, having trailed many different types of trailers both at work and play, with a wide variety of loads, Ive concluded it just seems to work best this way
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muz7 my tyres say max 44psi so would it be a safe bet then to run at 40psi for road use ?
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14 July 2012, 21:27
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#15
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Member
Country: UK - England
Town: Wakefield
Boat name: Bouncer
Make: Redbay Stormforce
Length: 6m +
Engine: 2x Honda 100 Hp
MMSI: 235025718
Join Date: Jun 2009
Posts: 4,177
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I am with muz on this one mine are 65 psi max but I run mine around 60 psi
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14 July 2012, 21:30
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#16
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RIBnet admin team
Country: Ireland
Length: 4m +
Join Date: Feb 2008
Posts: 14,893
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I've always run mine a shade under max, on the basis that I wasn't running them under the full load they were designed to carry.
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14 July 2012, 21:37
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#17
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Member
Country: UK - England
Town: Ashton-under-Lyne Lancs
Boat name: IMOGEN
Make: Air-Craft 5.4
Length: 5m +
Engine: Suzuki df70a
MMSI: 235087492
Join Date: May 2010
Posts: 7,078
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Mines an unbraked trailer and the maximum limit is 750kg so when the rib is loaded with fuel, anchor and equipment I'm up to the limit.
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14 July 2012, 21:45
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#18
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Member
Country: UK - Scotland
Town: Glasgow
Boat name: stramash
Make: Tornado
Length: 5m +
Engine: Etec 90
Join Date: Feb 2006
Posts: 5,090
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Quote:
Originally Posted by kerny
muz7 my tyres say max 44psi so would it be a safe bet then to run at 40psi for road use ?
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Well .. My 5.4 Tornado sits on a single axle trailer, but its quite a light boat,because its only a single console etc etc and I cant rember the tyre size coz its at work.. but from memory .. thats the max pressure on mine aswell, I checked them recently because one looked a bit softer than I would like, on checking it was at 30 so I put it to 35 and it looks fine at that, and more importantly .. equalled the other one.
Its all relative to the load its carrying, the tyre will have it stamped on it as to what its maximum load is.
If you need to use the trailer in particularly arduous terrain, you can also fit it with higher load index tyres, with heavier lay up, but again road performance varies accordingly.
I'd normally expect to see some sidewall deformity under normal conditions and load.
With a lot of modern cars using low profile stuff, we are very used to seeing no deformity at all these days on a tyre, but trailer tyres have a much larger sidewall and need to be assessed differently
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15 July 2012, 16:30
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#19
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Member
Country: UK - England
Town: Hampshire
Boat name: Altea 2
Make: Narwhal
Length: 5m +
Engine: 90 Mariner
Join Date: Aug 2011
Posts: 855
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Agree with all of the above - it's all relative and down to your personal discretion and preference.
Trouble is, when you're doing paid work, for someone else (who often isn't there, on site), you need to make a decision over the requirement and the last thing I want is someone ringing me to tell me I haven't inflated their tyres enough etc. I guess what I'm saying is I've got to do them all the same and if I inflate them to the tyre pressure stated on the wall / in my notes, then it's up to the customer if they want to run them at a deifferent pressure.
As everyone says - have a tow and make an educated decision, on the result, at the end of it.
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15 July 2012, 16:49
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#20
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Member
Country: UK - England
Town: Ashton-under-Lyne Lancs
Boat name: IMOGEN
Make: Air-Craft 5.4
Length: 5m +
Engine: Suzuki df70a
MMSI: 235087492
Join Date: May 2010
Posts: 7,078
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Thanks for all your advice TG, and yes I think common sense is the major factor here, like willk says, if you are up to the trailer weight limit then Maximum air pressure.
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