Richy B Posted September 27, 2010 Share Posted September 27, 2010 Hi all, We use a Brain James twin wheel/braked trailer for our 90 gayback comp truck, What should the the tyre pressures be, Ie cold and unloaded, I check um today and there anything between 55 - 86 lbs Quote Link to comment Share on other sites More sharing options...
zim Posted September 27, 2010 Share Posted September 27, 2010 Depends on the trailer / wheels. They'll be written on the sidewall. G Quote Link to comment Share on other sites More sharing options...
Richy B Posted September 27, 2010 Author Share Posted September 27, 2010 155/70/12 Quote Link to comment Share on other sites More sharing options...
taurion Posted September 27, 2010 Share Posted September 27, 2010 Probably 95psi/6.5bar but check sidewalls and always have at least one spare. Quote Link to comment Share on other sites More sharing options...
jil6939 Posted September 27, 2010 Share Posted September 27, 2010 I would suggest you have a look and see if they have a web info page. The ones on my ifor trailer are about 90-95psi. The side wall pressure is only a max pressure not amrunning pressure. Quote Link to comment Share on other sites More sharing options...
zardos Posted September 27, 2010 Share Posted September 27, 2010 155/70/12 It should also say what pressure to inflate them to on the sidewall for max load (as well as max pressure). Our Ifor Williams 3.5 ton beaver tail trailer trailer has 95psi printed on the sidewall (check here on where to find the info) Or as a guide check http://www.ntta.co.uk/law/trailers/load_pressure.aspx The table says 87/90 PSI as a guide for 155/70 x 12 depending on speed and axle load but it also depends on the load rating of the tyre which you have not quoted. e.g . our Ifor is 185/60/R12 104/101 N which 104 is 900Kg for a 3.5T trailer (900Kg x 4 = 3.6T) Load and speed tables here Quote Link to comment Share on other sites More sharing options...
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