candapack Posted May 25, 2015 Share Posted May 25, 2015 My van is fitted with Goodride 215/70 R15C tyres. Peugeot - it's a Boxer based coachbuilt - recommend that the original tyres be run at 79.5 psi Online, I have discovered that the Goodride tyres should be run at 54 psi. I know nothing about tyres, but the difference between 54 and 79.5 seems like a lot. I'm currently running them at 70, it's a bit rattly, but I don't want to reduce the pressure without some input from you nice folk. Look forward to hearing from you, no rush but we're off tomorrow morning. 8-) PS, it's a 3500kg van, well it's meant to be, I'm afraid I haven't been to a weighbridge. :$ . I don't think it's overloaded. Link to comment Share on other sites More sharing options...
hallii Posted May 25, 2015 Share Posted May 25, 2015 It is difficult to be exact without weighing each axle. It took me about 2 years to get it right! I suggest that 79 is to high and 54 is a bit low. Probably somewhere in between. H Link to comment Share on other sites More sharing options...
tonyishuk Posted May 25, 2015 Share Posted May 25, 2015 The only people that can give you the recommended pressures are the manufacturers. In the past I have used the maximum axle loading for the weight and emailed the manufacturers. In my case Michelin, and they replied with the pressures for the tyres fitted. Michelin, doubtless other manufacturers, make a range of tyres for m/homes. They all have differing pressures even for a similar type depending on conditions. I think every Fiat has a 70 PSI sticker on the drivers door !! Regardless of the tyres fitted. Rgds Link to comment Share on other sites More sharing options...
Billggski Posted May 25, 2015 Share Posted May 25, 2015 Difficult one, tyre makers seem to say 80psi on the rear for MHs whatever the load to cover themselves. Where did you get 54psi from? That may be for vans. The Goodrides are a budget tyre, I think made in China, and you may not be able to contact them for advice. Check the load rating to make sure they are suitable, you will probably need 108 rating, they may say a maximum pressure on the side, but apparently that is a guide for the American market. Link to comment Share on other sites More sharing options...
gmacz Posted May 25, 2015 Share Posted May 25, 2015 Same tyre size. 60 front and 65 rear. Was running 55 and 60 with previous campervan tyres, now running van tyres as well. Link to comment Share on other sites More sharing options...
Keithl Posted May 25, 2015 Share Posted May 25, 2015 Chris, as you have said these are C rated tyres and not CP then I think I will be fairly safe in assuming they are NOT Camping Car tyres hence 5.5 bar is way too high. I have just looked at a Continental tyres brochure and the maximum recommended pressure for a NON CP tyre of your size is 4.5 bar (65 psi) at a load of 2060 kg. For reference a CP tyre has a recommended pressure of 5.5 bar (80 psi) at the same load. Pressures for lower loads are correspondingly lower for the C tyre compared to the CP. PS Pressures for similar axle weights should be pretty much the same for different makes of tyre as long as the Load Index (LI) of the tyres is the same. Keith. Link to comment Share on other sites More sharing options...
candapack Posted May 25, 2015 Author Share Posted May 25, 2015 Thanks all. Very helpful as usual. Think I'll reduce to 60 front, 65 rear and see how it goes. TTFN, Link to comment Share on other sites More sharing options...
Brian Kirby Posted May 25, 2015 Share Posted May 25, 2015 Where did you get these tyres - were they on the van when you got it, or have you had them fitted? If you had them fitted, the company that fitted them should have the load/pressure information for them. Alternatively look for the importer and ask them. However, you'll first need to visit a weighbridge with the van fully loaded, and get its actual laden weight plus the actual load on each axle. Overload isn't a matter of belief, that's for church! :-) My point is that the van is on budget tyres, which one might expect to be less tolerant of overload than a premium brand. So, if either axle is overloaded it is likely the tyres may also be, but also that the tyres may be under-inflated for the load they are carrying, which carries the risk of a blow-out. If you can't get any sense from the fitters, or importer, I'd suggest downloading a copy of "Motorhome Tyres and Your Safety" from the Tyresafe.org website. (Can't give you a link as I'm not at home, but someone else may be able to if you can't find them.) The booklet has chart of tyre sizes, load indices, and the appropriate pressures to use for axle loads for both "plain vanilla" commercial tyres such as you have, and "camping" tyres. Although not a manufacturer's specific pressure for load chart, Tyresafe is an organisation formed by the British Tyre Manufacturer's Association, and uses information agreed by the manufacturers. Providing the tyres are EU marked, they should be OK at the Tyresafe recommended pressures. This approach would be better, and safer, IMO, than guesswork - which seems to be where you are now. Link to comment Share on other sites More sharing options...
Robinhood Posted May 25, 2015 Share Posted May 25, 2015 ...I note this has been revised since the original many of us have seen, but the document referenced by Brian is: http://www.tyresafe.org/images/tyre-safety-guide/motorhome-leaflet.pdf ...which will at least take some of the guesswork out of deciding the required pressures (but real axle loadings required from a weighbridge). Link to comment Share on other sites More sharing options...
Billggski Posted May 26, 2015 Share Posted May 26, 2015 There are loads of weigh bridges about (no pun intended) and my local one costs £7 for both axles and total weight. Just google "weigh bridges" and your locality and you should find a list. Really easy and essential information, if sometimes worrying when you have to decide what to leave behind. Link to comment Share on other sites More sharing options...
Billggski Posted May 26, 2015 Share Posted May 26, 2015 No one has mentioned the valves yet, local tyre fitters tend to fit normal rubber car valves as a matter of course. But these need to be steel screw in or steel cored valves to be safe at the pressures we are discussing. Link to comment Share on other sites More sharing options...
nige118 Posted May 26, 2015 Share Posted May 26, 2015 Hiya mine are continental 215/70/15c and they are 80psi . They have steel valves only put this pressure in if you have steel ones. If they are rubber they must be a lot lower. Hope this helps. Link to comment Share on other sites More sharing options...
Derek Uzzell Posted May 27, 2015 Share Posted May 27, 2015 The normal recommendation for tyre-valves when ‘camper’ tyres are fitted and inflated to high pressures is to use clamp-in metal valves. This type of valve is not made from steel (it would be too difficult to do) and will usually be made from brass (bare or nickel-plated) or sometimes from light alloy. Examples are here, with the 235030 design being the sort of clamp-in valve commonly fitted to motorhome rims. http://www.auto4.co.uk/Valves-and-Valve-Hardware/Clamp-In-Valves The valves seal to the rim using either a stepped rubber ‘washer’ or an O-ring, and care needs to be taken when fitting to tighten the retaining nut to the recommended torque setting (low for stepped-washer valves; higher for the O-ring type). Besides clamp-in valves, specialised snap-in valves are available that can handle the high pressure recommended for ‘camper’ tyres http://www.alligator-ventilfabrik.de/index.php?ALLIGATOR_CVV48c7723cc0fe7 Schrader markets something similar that Ford has factory-fitted to Transits since 2007. Link to comment Share on other sites More sharing options...
candapack Posted June 6, 2015 Author Share Posted June 6, 2015 Brian Kirby - 2015-05-25 10:02 PM Where did you get these tyres - were they on the van when you got it, or have you had them fitted? If you had them fitted, the company that fitted them should have the load/pressure information for them. Alternatively look for the importer and ask them. However, you'll first need to visit a weighbridge with the van fully loaded, and get its actual laden weight plus the actual load on each axle. Overload isn't a matter of belief, that's for church! :-) My point is that the van is on budget tyres, which one might expect to be less tolerant of overload than a premium brand. So, if either axle is overloaded it is likely the tyres may also be, but also that the tyres may be under-inflated for the load they are carrying, which carries the risk of a blow-out. If you can't get any sense from the fitters, or importer, I'd suggest downloading a copy of "Motorhome Tyres and Your Safety" from the Tyresafe.org website. (Can't give you a link as I'm not at home, but someone else may be able to if you can't find them.) The booklet has chart of tyre sizes, load indices, and the appropriate pressures to use for axle loads for both "plain vanilla" commercial tyres such as you have, and "camping" tyres. Although not a manufacturer's specific pressure for load chart, Tyresafe is an organisation formed by the British Tyre Manufacturer's Association, and uses information agreed by the manufacturers. Providing the tyres are EU marked, they should be OK at the Tyresafe recommended pressures. This approach would be better, and safer, IMO, than guesswork - which seems to be where you are now. Thanks Brian - and everyone else. The tyres were on the van at purchase, they are I believe of Chinese origin. As well as the weighbridge, I am going to bite the bullet and have camper tyres fitted. Most mentions seem to go to Michelin Agilis, but would welcome suggestions/recommendations for any others. As well as safety, road noise is a key issue! Cheers, Link to comment Share on other sites More sharing options...
Rayjsj Posted June 6, 2015 Share Posted June 6, 2015 I would go for Continental Vanco Camper, they seem easier to get hold of (IMO). And are a bit cheaper. Had them on both of my latest vans, with no complaints. Link to comment Share on other sites More sharing options...
Keithl Posted June 6, 2015 Share Posted June 6, 2015 Chris, If it where me I would go for none camper tyres as they are more than capable of all you will require from them. For example our 3,800 kg AT runs on Conti Vanco 2 'C' tyres at a max pressure on the rears of 60 psi. Ours are 225/70 15 and are more than adequately rated for our max weights. It was supplied from new with Conti Vanco 8PR 'C' tyres so I have replaced like with like. I know others argue otherwise but I don't see the added benefit of CP tyres for the inflated price. Keith. And PS If your old tyres have life left on them then sell them as part worns, you will also save the disposal cost! Link to comment Share on other sites More sharing options...
dep123 Posted June 15, 2015 Share Posted June 15, 2015 My tyres are Continental Vanco Camper 217x70x15. I enquired of Continental who sent a chart based on weight of each axle. Hopefully I can attach it to this post and people may find it useful.2157015109CP Bar-Psi.docx Link to comment Share on other sites More sharing options...
Derek Uzzell Posted June 16, 2015 Share Posted June 16, 2015 A selection of Continental Technical Databooks is available on-line. A copy of the 2014-2015 car/4x4/van Databook (that includes inflation-pressure to axle-weight information for Continental tyres suitable for motorhome use) can be downloaded via this link http://www.continental-pneumatici.it/www/download/pneumatici_it_it/temi/edownload/Prodotti/Guida_tecnica_2015.pdf Link to comment Share on other sites More sharing options...
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