Reply
 
Thread Tools Search this Thread
 
Old 14 July 2012, 10:48   #1
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
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.
__________________
cahooney is offline   Reply With Quote
Old 14 July 2012, 11:34   #2
Member
 
Country: UK - England
Town: Sussex
Make: RIBTEC 655
Length: 6m +
Engine: Yam 150
Join Date: Oct 2007
Posts: 1,160
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.
__________________
thomas is offline   Reply With Quote
Old 14 July 2012, 11:35   #3
Dhf
Member
 
Dhf's Avatar
 
Country: UK - Wales
Length: no boat
Join Date: Jan 2012
Posts: 1,012
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,
__________________
Dhf is offline   Reply With Quote
Old 14 July 2012, 13:46   #4
Member
 
actions's Avatar
 
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
Send a message via Skype™ to actions
Quote:
Originally Posted by Dragonhawk ficht View Post
ps, I would love to hear you doing a radio check with the Coast guard, there gonna love your call sign,
Brilliant, Just Brilliant.
__________________
actions is offline   Reply With Quote
Old 14 July 2012, 17:13   #5
Member
 
Bigmuz7's Avatar
 
Country: UK - Scotland
Town: Glasgow
Boat name: stramash
Make: Tornado
Length: 5m +
Engine: Etec 90
Join Date: Feb 2006
Posts: 5,090
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
__________________
Bigmuz7 is offline   Reply With Quote
Old 14 July 2012, 18:06   #6
Member
 
Trailer Guy's Avatar
 
Country: UK - England
Town: Hampshire
Boat name: Altea 2
Make: Narwhal
Length: 5m +
Engine: 90 Mariner
Join Date: Aug 2011
Posts: 855
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
Trailer Guy is offline   Reply With Quote
Old 14 July 2012, 18:18   #7
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
Tyre pressure

Much obliged for the replies folks

ps do you think I should change my call sign
__________________
cahooney is offline   Reply With Quote
Old 14 July 2012, 18:21   #8
Member
 
kerny's Avatar
 
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
RIBase
Send a message via Skype™ to 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.
__________________
Member of S.A.B.S. (Lancashire Division)
kerny is offline   Reply With Quote
Old 14 July 2012, 18:39   #9
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
Quote:
Originally Posted by cahooney View Post
Much obliged for the replies folks

ps do you think I should change my call sign

Yea "Kiss Ass"
__________________
Mercury is offline   Reply With Quote
Old 14 July 2012, 18:45   #10
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
Tyre pressure

Now thats got to take some licking
__________________
cahooney is offline   Reply With Quote
Old 14 July 2012, 20:06   #11
Member
 
Trailer Guy's Avatar
 
Country: UK - England
Town: Hampshire
Boat name: Altea 2
Make: Narwhal
Length: 5m +
Engine: 90 Mariner
Join Date: Aug 2011
Posts: 855
Quote:
Originally Posted by kerny View Post
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.

Hi Kerny, it's what I do on every trailer service, providing the tyres are cold.
Trailer Guy is offline   Reply With Quote
Old 14 July 2012, 20:08   #12
Member
 
kerny's Avatar
 
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
RIBase
Send a message via Skype™ to kerny
Quote:
Originally Posted by Trailer Guy View Post
Hi Kerny, it's what I do on every trailer service, providing the tyres are cold.
Thanks TG I will stick to that then
__________________
Member of S.A.B.S. (Lancashire Division)
kerny is offline   Reply With Quote
Old 14 July 2012, 21:17   #13
Member
 
Bigmuz7's Avatar
 
Country: UK - Scotland
Town: Glasgow
Boat name: stramash
Make: Tornado
Length: 5m +
Engine: Etec 90
Join Date: Feb 2006
Posts: 5,090
Quote:
Originally Posted by kerny View Post
Thanks TG I will stick to that then
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
__________________
Bigmuz7 is offline   Reply With Quote
Old 14 July 2012, 21:22   #14
Member
 
kerny's Avatar
 
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
RIBase
Send a message via Skype™ to kerny
Quote:
Originally Posted by Bigmuz7 View Post
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
muz7 my tyres say max 44psi so would it be a safe bet then to run at 40psi for road use ?
__________________
Member of S.A.B.S. (Lancashire Division)
kerny is offline   Reply With Quote
Old 14 July 2012, 21:27   #15
Member
 
mick's Avatar
 
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
I am with muz on this one mine are 65 psi max but I run mine around 60 psi
__________________
mick is offline   Reply With Quote
Old 14 July 2012, 21:30   #16
RIBnet admin team
 
willk's Avatar
 
Country: Ireland
Length: 4m +
Join Date: Feb 2008
Posts: 14,893
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.
__________________
willk is offline   Reply With Quote
Old 14 July 2012, 21:37   #17
Member
 
kerny's Avatar
 
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
RIBase
Send a message via Skype™ to kerny
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.
__________________
Member of S.A.B.S. (Lancashire Division)
kerny is offline   Reply With Quote
Old 14 July 2012, 21:45   #18
Member
 
Bigmuz7's Avatar
 
Country: UK - Scotland
Town: Glasgow
Boat name: stramash
Make: Tornado
Length: 5m +
Engine: Etec 90
Join Date: Feb 2006
Posts: 5,090
Quote:
Originally Posted by kerny View Post
muz7 my tyres say max 44psi so would it be a safe bet then to run at 40psi for road use ?
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
__________________
Bigmuz7 is offline   Reply With Quote
Old 15 July 2012, 16:30   #19
Member
 
Trailer Guy's Avatar
 
Country: UK - England
Town: Hampshire
Boat name: Altea 2
Make: Narwhal
Length: 5m +
Engine: 90 Mariner
Join Date: Aug 2011
Posts: 855
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.
Trailer Guy is offline   Reply With Quote
Old 15 July 2012, 16:49   #20
Member
 
kerny's Avatar
 
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
RIBase
Send a message via Skype™ to kerny
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.
__________________
Member of S.A.B.S. (Lancashire Division)
kerny is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




All times are GMT. The time now is 03:34.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.