Tyre pressures
We have a 2001 Autocruise Stargazer and have Hankook 195/70R/15C tyres all round. We currently inflate to 55psi front and 60psi rear. Does anyone know if this is correct? I have tried to find out but not getting anywhere. Jenny
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There was another post on here last week about tyre pressures. You need to take MH down to weigh bridge and weigh front and back axels. Everyone carries round different weights and what you consider is not fully loaded another may consider differently. Once
you have it weighed you can ring the tyre manufacture with the weight for the correct pressure. Tyre pressure also varies between manufacturer.0 -
Thanks Q4. I'll do that.
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Aparrently some tyre pressure manufacturers respond to specific requests by quoting the default vehicle manufacturers figures which will be geared towards a fully loaded commercial vehicle i.e. it is not a "bespoke" calculation. My van has Bridgestone Duralis
tyres and I recently did an exercise with "fully laden" (in my terms) weighbridge figures. Bridgestone were impressively quick and helpful and came up with "bespoke" tyre pressures which were significantly lower than the default
pressures.It is possible to download a motorhome specific leaflet from Tyresafe which has a table of tyre pressues for numerous combinations of tyre size/speed rating/construction however not every permutation is covered and in my case
the configuration was not hence recourse to the manufacturer.0 -
Curiously when I tried to check the Tyresafe website they appear to have pulled the brochure dealing with M/H tyres. However the pressures you indicate per the chart (I kept a copy from the website) would appear to allow a total load less than 3500kg. However
the load factor on and construction of the tyres are also issues not just the size. So the advice to load up weigh and get manufacturers advice is the best course of action.0 -
195/70R/15C tyres are not campervan tyres. Tyres with a CP designation i.e. michelin xc or continental vanco camper tyres have a cp rating. The rating is for tyres with additional sidewall strength and overloading by motorhomers!
Search this site for royandsharon's table and use the plated weights to determine the pressures front and rear. On our 3.5 tonne hymer we've been using 60 front and 65 rear for 11 years and 130,000 miles after taking advice from michelin then confirmed by continental.
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195/70R/15C tyres are not campervan tyres.
They are in fact commercial van tyres, at least that is my understanding. I also have "C" tyres fitted all round on my van so you are not alone. I weighed front and back axles at my local weighbridge and then inflated the tyres to the pressures indicated
in my chassis handbook for that weight.peedee
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We also have caravan tyres with a 'c' on them. We then set the pressures as indicated on the wheel arch of the caravan.
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Just to be clear "Ordinary" commercial van tyres may be adequate for motorhome use or they may not depending on the real world loading which you apply so a visit to the weighbridge is essential especially if you tend to travel fully laden. What is clear
is that CP tyres will normally a greater axle loading. Although speed is not a major factor on motorhomes the speed factor of the tyre may be a consideration also.0 -
I think it wise to check the axle and gross weights regardless of what tyres are fitted. I don't know if it is more essential just because you have commercial van tyres fitted but as far as I know Chasncath is correct in that the CP tyre has a strengthened
wall mainly to allow for the fact a motorhome can sit unused for long periods of time. Commercial van tyres are more readily available than CP ones and may be slightly cheaper.peedee
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Here's a link to the table given to royandsharon by continental
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