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Stefan Lloyd View Drop Down
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Posts: 1599 		Post Options Post Options   Quote Stefan Lloyd Quote  Post ReplyReply Direct Link To This Post Topic: Trailer wheels tyres
    Posted: 18 Oct 06 at 6:50pm

Originally posted by Ian99

At 25psi with those small tyres, I'd have thought there's a fairly high risk you'll hit a bump and stretch the bead away from the rim enough to lose all the air in the tyre.

Ever heard of it happening? http://www.trojantrailers.co.uk/store.php?faq=4 doesn't appear to suggest it is a risk.

I thought everyone who towed dinghies regularly used low tyre pressures. AFAIK it is standard advice and I'm pretty astonished with some of the suggestions on this thread.
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SetSail View Drop Down
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Posts: 100 		Post Options Post Options   Quote SetSail Quote  Post ReplyReply Direct Link To This Post Posted: 18 Oct 06 at 7:27pm
well its all ok for you who have a driving licence before 1996. i however,
have to take a towing test which is a pain in the backside because i got mine
after that year.

this means i let the person who has to tow worry about tyre pressure.

not many people know this fact. just though i'd throw this irrelevant
information it into the equation.

Edited by SetSail
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Jalani View Drop Down
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Posts: 164 		Post Options Post Options   Quote Jalani Quote  Post ReplyReply Direct Link To This Post Posted: 18 Oct 06 at 7:30pm

Ian 99, I'd say you haven't experienced a blowout from an over pressurised tyre - 60 and 90 psi have been mentioned here!

I've seen (and helped clear up) the aftermath of a trailer tyre blowout at high speed on a French autroute and it is messy. With heavier trailers it can even overturn the towing vehicle, that gets really messy!

I'm sure that somewhere here on the 'net there'll be a page with advice on tyre pressures for lightweight trailers but I can't actually be bothered to look at present. I'll stick with what I've done for 30 or so years and keep my tyres in good condition and pressures around 30psi. In possibly hundreds of thousands of miles I've had 1 blowout and maybe half a dozen flats (oh yes, and a lost wheel!!)

 
Far too old to still be doing this......

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combat wombat View Drop Down
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Posts: 345 		Post Options Post Options   Quote combat wombat Quote  Post ReplyReply Direct Link To This Post Posted: 18 Oct 06 at 8:16pm
I personally have had a trailer tyre come off the rim.  It wasn't from bouncing, it was going round a roundabout and the tyre "rolled" sideways off the rim.  Wasn't going quick at all but the trailer slid sideways and the other tyre rolled off too.  This was clearly from underinflation.  Not sure what the pressures were but they "looked" fine, probs about 20psi.  Safe to say I check them properly now before every trip. 

Also, the boat should be strapped down enough to stop it bouncing on the trailer.  And yes, I know you don't strap them too tight so you don't damage the hull but if the boat is loose enough to bounce on its trolley then its loose enough to bounce off the back of the trailer full stop. 

It depends on the boat you tow.  Something like a Laser won't need high pressures but I know my B14 does, when its carrying 2 masts, the hull, sails, wings and other stuff.  I don't pump the Contender tyres up as much. 

"i however, have to take a towing test which is a pain in the backside because i got mine after that year."

If you passed after 1997, you can tow up to 750kgs without having to take an extra test, provided the gross train weight of the car and trailer does not exceed 3500kgs - http://www.direct.gov.uk/Motoring/DriverLicensing/WhatCan YouDriveAndYourObligations/WhatCanYouDriveArticles/fs/en?C ON TENT_ID=4022547&chk=oQylE9
Provided you hold the category B licence as stated on the back of your photocard licence. 


Edited by combat wombat
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HinExeter View Drop Down
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Posts: 10 		Post Options Post Options   Quote HinExeter Quote  Post ReplyReply Direct Link To This Post Posted: 18 Oct 06 at 9:54pm

Tyres too hard will shake the boat to bits, too soft and they will get hot and possibly blow out or roll off the rim.

Start at about 40psi for a mid weight boat, if the tyres get warm add 5psi and try again. If nothing warms up let 5psi out and see if it's warming up, if so put the 5 back in. If still cold let another 5 out etc. Also note the heat of the hub, if that gets warm it needs a service. 

The 60psi on the side wall is the max for the tyre at max load, 300kg per axcel for 8 inch I think, most boats all loaded up on the trailer will be 200kg ish so the max should not be needed. 
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stuarthop View Drop Down
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Posts: 1040 		Post Options Post Options   Quote stuarthop Quote  Post ReplyReply Direct Link To This Post Posted: 18 Oct 06 at 11:14pm
set sail, you must be towing a trailer which is either braked or over 750kg if not it should be perfectly legal to tow it, (though i would check yourself) i passed my test in oct 2005 and towed quite a lot without any worries, been banned more recently (speeding though) but will be back on the road and towing my boat again very soon

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