Just tried this and it matches the plated pressure of 65psi exactly. Thanks Dan. Great research and a clear video as usual. Invaluable to us, returning to caravanning after many years.
Was searching for this information long time and finally, found your brilliant formula for the correct PSI related to tire load index and GVW. THANKS ALOT 👍👍👍 for the effort you did and sharing these information 🌹🌹🌹
Dan I have a lunar Clubman si mtplm 1495 the book said tyre pressure for 185r14c100/102 is 65psi but using your calculator and several similar on line it comes out at an average of 60 psi it looks like lunar have just quoted the tyres max pressure marked on the side wall ie 65 psi.
Excellent video Dan, my brother was using this just last night to inform me about his trye pressure on his van, and so i will be doing the same soon. keep up the videos' Very informative and great delivery
hi, very helpful video thank you what if i do not exceed the MTPLM ? example the MTPLM is 1236 and i load the trailer that is 250kg with 350kg = total 600kg I should recalculate the tire pressure with 600kg for a smother ride right ? thank you
Nice vid Dan. I thought i would let you know my experience with tire pressures on our bailey bretange s7. Our van is plated 42psi - the van was a bit rough to tow, it bounced and the tires heated up and ATC was activating a lot. This was also the pressure the dealer set it to - luckly i only towed a few miles feeling very unhappy with the outfit. When i stopped i could smell hot rubber so i initially put the tires up to 48psi and towed it home. When i checked the hand book that stated 52psi. I inflated it to 52psi and the van rolled much better with no more ATC activations. After asking on the caravan club forum I went straight to bailey who also confirmed it should be 52psi So be careful what the plate says, if someone on the production line makes a typo it could land you in trouble. I wish you had done this a few month back mate, it would have saved me a lot of head scratching and digging though forums and emails to the main dealer. thanks mate
Morning Roy - That is a very interesting tale, Thank you for sharing !! There is so much information out there on what pressures should be, but no clear information on how to calculate them. and even from the handbook itself !! Glad you found this useful, sorry i didn't upload this a few months ago ;-) Take care Dan
I still have not determined a correct pressure for a van we just bought. One dealer I rang said 40 PSI, calculation comes out at 60 PSI (very close to max PSI, a worry). The plate on the van says - wait for it - 27 PSI !!
Hi Dan, saw this while back, thank you. Have like everyone else only just been out, and with my with my new Tyre Pal system, I was monitoring the tyre pressure, and was concerned to see that my starting pressure of 57psi rose to 65psi, which is the maximum pressure while travelling, is this something to be worried about?
Great. I used to have a Lunar Lexon and had the tyres at 55psi but was wondering if that was way too much and have sold the caravan, I was fearful I may have given the wrong info to the new onwers, but this makes a lot of sense and I was right after all. Phew.
Just an off the wall question...is it feesable to get a 12v timer,rig it to a/ some computer fans and set to blow air around,whilst in storage mainly,to help prevent mould. There is a solar panel on roof,so battery always charged. I know how you like to make interesting stuff. Regards,Richi.
Another brilliant video Dan, I have learned a lot from all you're videos as well as follow our adventures. I have a handbook and also a receipt for tyres that are now 4 years old would you recommend changing them for new ones at that age or will they be okay. I want my first trip out to be enjoyable and also safe.
Hi, i would change them at 5 years old, but do look at the condition of them, if they look like they are cracking, falling apart or bulging - you should change them ASAP. Take care Dan
Hi again. A couple of comments. 1st - Due to the fact that you could prefer to upgrade a bit the max load of your next tyre ... the pressure label on the carvan and/or on the user manual could be totally wrong ... also more tha 1 bar (many caravans born with tyres that have Pmax of only 3.5bar), so I always use that formula (keeping a spare of 0.1-0.2 bar more or less the calculated value ... to be used looking the shape of the caravan - of course beeing alwais below the max pressure). Moreover: due to the physical properties of the tyre and of the air (normally used to inflate them), also on a perfect mounting it's normal to loose some pressure during the weeks. and so i suggest to test the pressure quite often 2- safety on he road: I'm thinking that a very good safe device for our Caravan would be the TPMS. Have you ever tried it on the Caravan tyres? I would be interested to try the "FOBO FB1574 Bike" - for many pros i see (bluetooth 4.0, no other devices .. just an app, siply battery changing, user friendly app with the alarm as well.....) - What do you think about that?
HI, Excellent points there, and I'm glad someone is paying attention. IN terms of TPMS, we use TyrePal. very easy to install, super useful display in the car, to monitor tyre pressure & temperature. Warnings for over heating, under pressure and over pressure too. We simply woulnt be without it now. Have a look on our videos for Tyre Pal, happy to answer any questions you may have. Take care Dan
Hi dan, I'm confused, as I've just worked my psi out your way but it differs from my handbook, (I've the correct tyres as specified by the manufacturer) doing the calculation mine should be 50.9psi yet my handbook says 42psi??
Hi Stuart - Yes use your handbook 1st - if you don't have that information, this is a perfectly acceptable way of calculating what your pressures should be. Remember this method is a "ball park" figure - it won't take specifics like load distribution, nose weight and other towing dynamics into account - That information will be set out from your caravan manufacturer etc. This method simply shows you a safe pressure that the tyre can be inflated to. Hope that helps.
Hello Dan, I am slightly confused about your tyre pressure video and also you calculator. I quote from your pressure calculator " Some tyres have this Tyre code written on them : 185 R14C 102/100 Q Again we are just interested in the load value, which in this case is 102/100 But which one is it ? This is quite simple. The 102 refers to a load rating if used on a twin axle. The 100 is the load rating if used on a single axle ‘van." on the above video you recommend to use the the higher number. Can you clarify please.
I'm confused, you say your favourite ref. site is Tyresafe.org ? They also provide an automatic calculator and when I use that it gives a completely different result??? That suggests your formula is wrong? With the exact same information as you give here they say 63 psi, someone is wrong.
My tyres are due to be changed , 104/102 load , I contacted black circle to confirm what you said about axles .. black circle said it's a maximum & minimum.. nothing to do with the number of axles.
Hi Scott, This is indeed worrying. i would recommend you get back in contact with the person you spoke to and ask them to read their own website text. If you are in any doubt have a look at the TyreSafe.org site, they have lots of useful information and they go into a lot of detail too. Hope that helps Dan
Hello Dan. Thx for sharing. My doubt is related to my single axle caravan. Maximum load is 975Kg; wheels are 165R13 91R (old measure; not easy to find a tyre with load index 84). Wheel are rated for a load higher than real maximum weight. Max pressure 54PSI and max load 615Kg. With the calculation provided inflating pressure should be 43PSI that seems low. In the web I could find this link www.tyresafe.org/check-your-pressures/caravan-pressure-calculator/. Calculating with data the pressure required is 46PSI that sounds better. I suppose that if wheel load index is higher than needed, the calculation is not correct. Let me know your thought. Andrea
The Trudgians Hi Dan. Found it using the link, but I cannot for the life of me see how to get to it directly from the website. Not sure what you mean by it being in the description. I also looked under technical.
ahh, sorry - The link is in the description of this video above. these comments. It is also in Technical - but the page is quite old on our site so you will need to look under "technical" and go back to older posts (link a the bottom of the technical page) Hope that helps. Dan
The Trudgians My fault. I found it after I replied. Didn't realise it was an old post. I thought it was new so expected it to be on the first page. Many thanks.
Just tried this and it matches the plated pressure of 65psi exactly. Thanks Dan. Great research and a clear video as usual. Invaluable to us, returning to caravanning after many years.
What a man. Not many would go the extra mile and redo. You are a star.
Great information, 40 years of Caravanning and now I know how to do it properly. ❤️
Was searching for this information long time and finally, found your brilliant formula for the correct PSI related to tire load index and GVW.
THANKS ALOT 👍👍👍 for the effort you did and sharing these information 🌹🌹🌹
Thanks for the great info once again, I'll be using the info on my tyres on my van as its been stood for the winter and is now on a seasonal pitch.
Dan I have a lunar Clubman si mtplm 1495 the book said tyre pressure for 185r14c100/102 is 65psi but using your calculator and several similar on line it comes out at an average of 60 psi it looks like lunar have just quoted the tyres max pressure marked on the side wall ie 65 psi.
Excellent video Dan, my brother was using this just last night to inform me about his trye pressure on his van, and so i will be doing the same soon.
keep up the videos' Very informative and great delivery
Thank you Jim, thats very kind & glad you have found it useful.
Take care
Dan
hi,
very helpful video thank you
what if i do not exceed the MTPLM ? example
the MTPLM is 1236 and i load the trailer that is 250kg with 350kg = total 600kg
I should recalculate the tire pressure with 600kg for a smother ride right ?
thank you
Presumably this results in the 'Nominal' tyre pressure for that particular van ?
.
Richard
Nice vid Dan.
I thought i would let you know my experience with tire pressures on our bailey bretange s7.
Our van is plated 42psi - the van was a bit rough to tow, it bounced and the tires heated up and ATC was activating a lot. This was also the pressure the dealer set it to - luckly i only towed a few miles feeling very unhappy with the outfit. When i stopped i could smell hot rubber so i initially put the tires up to 48psi and towed it home.
When i checked the hand book that stated 52psi. I inflated it to 52psi and the van rolled much better with no more ATC activations.
After asking on the caravan club forum I went straight to bailey who also confirmed it should be 52psi
So be careful what the plate says, if someone on the production line makes a typo it could land you in trouble.
I wish you had done this a few month back mate, it would have saved me a lot of head scratching and digging though forums and emails to the main dealer.
thanks mate
Morning Roy - That is a very interesting tale, Thank you for sharing !! There is so much information out there on what pressures should be, but no clear information on how to calculate them. and even from the handbook itself !!
Glad you found this useful, sorry i didn't upload this a few months ago ;-)
Take care
Dan
I still have not determined a correct pressure for a van we just bought. One dealer I rang said 40 PSI, calculation comes out at 60 PSI (very close to max PSI, a worry). The plate on the van says - wait for it - 27 PSI !!
Brilliant video thanks. Really useful to have the calculator on your website.
Thank you !
Dan
Hi Dan, saw this while back, thank you. Have like everyone else only just been out, and with my with my new Tyre Pal system, I was monitoring the tyre pressure, and was concerned to see that my starting pressure of 57psi rose to 65psi, which is the maximum pressure while travelling, is this something to be worried about?
Great. I used to have a Lunar Lexon and had the tyres at 55psi but was wondering if that was way too much and have sold the caravan, I was fearful I may have given the wrong info to the new onwers, but this makes a lot of sense and I was right after all. Phew.
Great video, we checked our tyres this week and thought they were too high, we can now calculate them,
Thats fab news Susan,
Glad to have been of service.
Take care
Dan
Just an off the wall question...is it feesable to get a 12v timer,rig it to a/ some computer fans and set to blow air around,whilst in storage mainly,to help prevent mould. There is a solar panel on roof,so battery always charged. I know how you like to make interesting stuff. Regards,Richi.
Just seen this video and it all seems very interesting but, is it okay to mix metric and imperial measurements in the same equation?
yeah its fine, the formula works.
Another brilliant video Dan, I have learned a lot from all you're videos as well as follow our adventures. I have a handbook and also a receipt for tyres that are now 4 years old would you recommend changing them for new ones at that age or will they be okay. I want my first trip out to be enjoyable and also safe.
Hi, i would change them at 5 years old, but do look at the condition of them, if they look like they are cracking, falling apart or bulging - you should change them ASAP.
Take care
Dan
Thanks dan fantastic video for a beginner like me and doing lots of research
that was most useful. Cheers Fella
Shouldbe (MTPLM - ball load)/2 to get load per tyre. Will drop the calculated tyre pressue by a few psi
Hi again.
A couple of comments.
1st - Due to the fact that you could prefer to upgrade a bit the max load of your next tyre ... the pressure label on the carvan and/or on the user manual could be totally wrong ... also more tha 1 bar (many caravans born with tyres that have Pmax of only 3.5bar), so I always use that formula (keeping a spare of 0.1-0.2 bar more or less the calculated value ... to be used looking the shape of the caravan - of course beeing alwais below the max pressure).
Moreover: due to the physical properties of the tyre and of the air (normally used to inflate them), also on a perfect mounting it's normal to loose some pressure during the weeks. and so i suggest to test the pressure quite often
2- safety on he road: I'm thinking that a very good safe device for our Caravan would be the TPMS. Have you ever tried it on the Caravan tyres? I would be interested to try the "FOBO FB1574 Bike" -
for many pros i see (bluetooth 4.0, no other devices .. just an app, siply battery changing, user friendly app with the alarm as well.....) -
What do you think about that?
HI,
Excellent points there, and I'm glad someone is paying attention. IN terms of TPMS, we use TyrePal. very easy to install, super useful display in the car, to monitor tyre pressure & temperature. Warnings for over heating, under pressure and over pressure too. We simply woulnt be without it now.
Have a look on our videos for Tyre Pal, happy to answer any questions you may have.
Take care
Dan
Very informative 👍 thankyou very much!
Hi dan, I'm confused, as I've just worked my psi out your way but it differs from my handbook, (I've the correct tyres as specified by the manufacturer) doing the calculation mine should be 50.9psi yet my handbook says 42psi??
Hi Stuart - Yes use your handbook 1st - if you don't have that information, this is a perfectly acceptable way of calculating what your pressures should be. Remember this method is a "ball park" figure - it won't take specifics like load distribution, nose weight and other towing dynamics into account - That information will be set out from your caravan manufacturer etc. This method simply shows you a safe pressure that the tyre can be inflated to.
Hope that helps.
Hello Dan,
I am slightly confused about your tyre pressure video and also you calculator. I quote from your pressure calculator "
Some tyres have this Tyre code written on them :
185 R14C 102/100 Q
Again we are just interested in the load value, which in this case is 102/100 But which one is it ? This is quite simple. The 102 refers to a load rating if used on a twin axle. The 100 is the load rating if used on a single axle ‘van." on the above video you recommend to use the the higher number. Can you clarify please.
I'm confused, you say your favourite ref. site is Tyresafe.org ? They also provide an automatic calculator and when I use that it gives a completely different result??? That suggests your formula is wrong? With the exact same information as you give here they say 63 psi, someone is wrong.
Only just come across this Dan Thank you
Many thanks Dan. Another great video.
Thanks Jon.
Thanks Dan, That is really useful.
My tyres are due to be changed , 104/102 load , I contacted black circle to confirm what you said about axles .. black circle said it's a maximum & minimum.. nothing to do with the number of axles.
Hi Scott, This is indeed worrying. i would recommend you get back in contact with the person you spoke to and ask them to read their own website text.
If you are in any doubt have a look at the TyreSafe.org site, they have lots of useful information and they go into a lot of detail too.
Hope that helps
Dan
Thanks Dan nice one 👍
Hello Dan. Thx for sharing. My doubt is related to my single axle caravan. Maximum load is 975Kg; wheels are 165R13 91R (old measure; not easy to find a tyre with load index 84). Wheel are rated for a load higher than real maximum weight. Max pressure 54PSI and max load 615Kg. With the calculation provided inflating pressure should be 43PSI that seems low. In the web I could find this link www.tyresafe.org/check-your-pressures/caravan-pressure-calculator/. Calculating with data the pressure required is 46PSI that sounds better. I suppose that if wheel load index is higher than needed, the calculation is not correct. Let me know your thought. Andrea
Thanks very easy to understand.
Excellent video. Very clear on how to calculate the pressures. You mention a calculator on your website. Probably being thick bur I can't locate it.
Hi Steve, its in the description - but here is the direct link for the calculator.
the-trudgians.com/tyre-pressure-calculator/
Thanks.
The Trudgians Hi Dan. Found it using the link, but I cannot for the life of me see how to get to it directly from the website. Not sure what you mean by it being in the description. I also looked under technical.
ahh, sorry - The link is in the description of this video above. these comments. It is also in Technical - but the page is quite old on our site so you will need to look under "technical" and go back to older posts (link a the bottom of the technical page)
Hope that helps.
Dan
The Trudgians My fault. I found it after I replied. Didn't realise it was an old post. I thought it was new so expected it to be on the first page. Many thanks.
AWESOME tutorial
brilliant as usual!!!
Thank you Sandy.
Take Care
Dan
Awesome vid thanks
brilliant thank you
No problem, glad to have been of help.
Take care
Dan
I saw you on the telly
Ha, Please don't hold that against us lol.
Cheers.
Thx!