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Post Options Post Options   Likes (0) Likes(0)   Quote Smelly Buoy Quote  Post ReplyReply Direct Link To This Post Topic: Trailer tyre pressures
    Posted: 30 Jun 2013 at 9:48pm
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Hmm, got a Workmate 5.5 with a 100hp 4 stroke yammy on the back. Trailer has 13" light commercial tyres. Can anyone suggest the correct tyre pressure?
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Post Options Post Options   Likes (0) Likes(0)   Quote paw Quote  Post ReplyReply Direct Link To This Post Posted: 30 Jun 2013 at 11:34pm
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Should have maximum psi written on the tyre rim. I would run close to that with full load on board
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Post Options Post Options   Likes (0) Likes(0)   Quote Phantom Menace Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jul 2013 at 12:24am
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Yep, as paw says - look at the pressure on the wall of the tyre.  

Light commercials usually take a lot more pressure than standard car tyres. (pretty much close to the max pressure for a standard service station air pump - but check the specific tyre pressure first)
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Post Options Post Options   Likes (0) Likes(0)   Quote Rob Optimist Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jul 2013 at 5:56am
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Higher pressures in your tyres makes it a lot easier to tow and keeps them cooler but also can make for a very hard ride on your trailer.
If you aren't overloading to much and not towing great distances consider running a bit less than max as it makes it a lot easier ride for your boat and trailer.
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Post Options Post Options   Likes (0) Likes(0)   Quote Smelly Buoy Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jul 2013 at 7:18am
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Thanks guys, I had already noted that the tyre said 65psi, which seemed high & is what made me ask. Given that they are light commercial tyres, I figured they might be over-spec for my rig, hence my asking for ideas from you fellas.
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Post Options Post Options   Likes (0) Likes(0)   Quote Olfart Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jul 2013 at 12:50pm
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I have light truck tires on my trailer which carries a 5.1 meter glass boat, with a 90hp Yamaha on the back.  I normally run around 40 PSI in the tires which seems to be about right for the towing I do.  I have always believed that for longer distance towing you need to be aware that tire pressures will rise a bit as the tires heat up, so running them at the max inflation as specified on the tires is not necessarily a good thing...
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Post Options Post Options   Likes (0) Likes(0)   Quote Finatic Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jul 2013 at 12:59pm
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I was running mine at 60psi, but now that gassies seem to be replacing their units with inflators that only go up to 50psi it's a bit of a prick ain't it.< id="adlesse_unifier_magic_element_id" style="display:none;">
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Post Options Post Options   Likes (0) Likes(0)   Quote Wide Load Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jul 2013 at 4:01pm
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I run 55psi in mine. 6.0 metre  ali boat on single axle.
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Post Options Post Options   Likes (0) Likes(0)   Quote Big -Dave Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jul 2013 at 6:21pm
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enough pressure to stop the tire bulging too much at the bottom, but not so much that there is no bulge.
I would think 30 -35 psi would be ample, depends on the tyre width too, wider the tire, the more weight it will carry at the same pressure.

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Post Options Post Options   Likes (0) Likes(0)   Quote GAZRAE Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jul 2013 at 6:35pm
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Mate, I've been in the tyre industry for about 15yrs and would recommend running 50psi in your tyres. That's what I run on my boat trailer, Which is a 550 Buccaneer.  Too little pressure causes the tyre to overheat which can cause the tyre to blowout. Cheers.
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Post Options Post Options   Likes (0) Likes(0)   Quote maccasparks Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jul 2013 at 6:48pm
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I Have light commercial tyres on my Nissan Van and have run them at 50psi for 5 years - its mint. You can really tell if the are getting down.
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Post Options Post Options   Likes (0) Likes(0)   Quote Smelly Buoy Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jul 2013 at 7:25pm
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Thanks guys, 50-55 sounds like the go. Agree about not maxing out the pressure to compensate for possible heat induced pressure increases.
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Post Options Post Options   Likes (0) Likes(0)   Quote GAZRAE Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jul 2013 at 8:37pm
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The recommended max tyre pressure on the sidewall of a tyre is for the max load weight for that tyre which is also stamped on the sidewall. eg 65psi at 850kg. So two tyres on your trailer would have a combined load capacity of 1700kg. Hope that helps, Cheers.Emoticons
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Post Options Post Options   Likes (0) Likes(0)   Quote Smelly Buoy Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jul 2013 at 9:47am
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Thanks Gazrae, tire wall says 670kg at 450kPa/65psi.
I was uncertain about the tinny boat weight with 100hp 4 stroke Yammy, but given it is a single axle set-up, I figured less than 1000kg.
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Post Options Post Options   Likes (0) Likes(0)   Quote Moki Marko Quote  Post ReplyReply Direct Link To This Post Posted: 04 Jul 2013 at 9:38pm
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I find its a compromise between - high tyre pressure, say 50psi, which seems to be good for the tyres and a slightly lower pressure, still around 40, which seems to be easier on the trailer, wheel bearings etc. especailly on long corrugated shingle roads.
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