Toby Dixon
Member
Best tyre pressure for T6 /T28 pls ??????
18 inch wheels
255/45/ R18 103Y
Seems to varying info
18 inch wheels
255/45/ R18 103Y
Seems to varying info
Tyre pressure T28
- Thread starter Toby Dixon
- Start date
Put the details and recommended tyre pressures of the original fit tyres or as found on the door shut sticky into an online tyre comparison site then put the new tyre details into the site and the comparison site will compute the new pressures do this for unloaded and loaded put the details on a new sticky place close to the original.
Toby Dixon
Member
Thanks ,48 psi all round seems a lot but hey ho
Check here...
Well it appears plain, the pressure has been provided for you why ask the question. Mostly questions are asked when no figure for the new size of tyre has been provided by the vehicle manufacturers sticky.
Only if fully loaded. 44 front, 36 rear for light load. Interpolate for medium loads.
Figures are in lbs and psi. Would have thought load is by axle, but I've not looked at the numbers to see if that makes sense.
I think possibly where some confusion might occur on the original vehicle sticky is that two tyres of differing size share the same psi instead of appropriating psi individually for each tyre separately.
235 55 R17
255 45 R18 = both the same pressures
both share the same hi and low tyre pressures but one may assume that the printed pressures one high and one low might be appropriated to each individual tyre size. I realise this myself when swapping tyres in the heavy rain and dark and making assumptions because the stick almost requires contortions to read the next morning I realised the mistake and corrected the psi. For me the sticky is not ideally placed and also the tyres above have their own high and low pressures but the last or lower two share the same pressures even though different sizes. I hope that make some sense a bit awkward putting into written words better IMHO
235 55 R17 = blar blar and blar blar
255 45 R18 =blar blar and blar blar
235 55 R17
255 45 R18 = both the same pressures
both share the same hi and low tyre pressures but one may assume that the printed pressures one high and one low might be appropriated to each individual tyre size. I realise this myself when swapping tyres in the heavy rain and dark and making assumptions because the stick almost requires contortions to read the next morning I realised the mistake and corrected the psi. For me the sticky is not ideally placed and also the tyres above have their own high and low pressures but the last or lower two share the same pressures even though different sizes. I hope that make some sense a bit awkward putting into written words better IMHO
235 55 R17 = blar blar and blar blar
255 45 R18 =blar blar and blar blar
Load seems to be by wheel. I’m not convinced by the answers though. It’s approx 10psi less than the vehicle tyre plate!
e.g. T28 with max load on front axle of 1600kg equals 800kg per wheel (1764lbs). Vehicle plate says 48psi for 255 45/18 103Y, Falken chart says 38psi. That’s a big difference.
Are all T28 provided with exactly the same psi recommendations are are they apportioned to particular versions of T28
Are all T30 given the same psi for instance A Caravelle Executive 4Motion and a T30 panel van both T30 the Caravelle lowest wt likely to be higher due to all the additional wt seats fancy seats and insulation blar blar just wondering. that is why I suggest using the original sticky or transposing the new tyres via a tyre comparison site.
????
Are all T30 given the same psi for instance A Caravelle Executive 4Motion and a T30 panel van both T30 the Caravelle lowest wt likely to be higher due to all the additional wt seats fancy seats and insulation blar blar just wondering. that is why I suggest using the original sticky or transposing the new tyres via a tyre comparison site.
????
Agree the numbers on the plate should be used, but, given the OP sounded unsure, I was expecting (but didn't check
) that the chart would correspond with the plate.
No they are not all exactly the same for the reasons you state. Plus the tyre options (C rated, XL etc) are different across PV, Caravelle and California etc.
That is what I have always assumed hence referring to the labels and using a tyre comparison site because many will not be using the same as ones self .
I have little idea why a particular tyre company might have different to a vehicle manufacture perhaps it could be a start from, depending on where which country it was written. I understand that Vehicle manufacturers pressures are not arbitrary I read somewhere that a consortium of tyre manufacturers and the tyre companies vehicle manufacturers chosen for vehicle testing settle the actual recommended pressures. I imagine that vehicle passenger Safety always upward in thoughts and that few owners measure weights day to day and that tyres become heated as speed increases through distortion and frictions. Of course vehicle manufacturers are also concerned with pollution and attaining acceptance so may have, ( pressure to elevate pressures) taking that into consideration. From what I read somewhere that it was tyre companies that made most of the decisions concerning tyres.
am i a million miles out on tyre pressure. Iam learning
A T28 has a GVWR of 2800kg which requires each wheel to to carry an equal share of 700kg (maybe adj for front back)
The load rating of the tyre has to exceed this but its stated on the sidewall of the tyre as a 2-3 digit instead of kg or lbs. Its also the load rating for max pressure which is also given on the tyre.
Knowing your should not inflate to the max, what you need is the load and inflation table for your tyres to determine an acceptable PSI below it that gives tyre a load characteristic above your Van's GVWR divided by 4.
the falkentire.com web site gives loads for a given index/psi combination in lbs. You can use this to determine a safe PSI or get the inflation table
from the tyre manufacture and maybe a PSI too that they consider is a minimum to avoid under inflation?
A T28 has a GVWR of 2800kg which requires each wheel to to carry an equal share of 700kg (maybe adj for front back)
The load rating of the tyre has to exceed this but its stated on the sidewall of the tyre as a 2-3 digit instead of kg or lbs. Its also the load rating for max pressure which is also given on the tyre.
Knowing your should not inflate to the max, what you need is the load and inflation table for your tyres to determine an acceptable PSI below it that gives tyre a load characteristic above your Van's GVWR divided by 4.
the falkentire.com web site gives loads for a given index/psi combination in lbs. You can use this to determine a safe PSI or get the inflation table
from the tyre manufacture and maybe a PSI too that they consider is a minimum to avoid under inflation?
think it is the European Tyre and Rim Technical Organisation (ETRTO) that plays a pivotal role in standardizing the dimensions and specifications of tyres, rims, and valves across Europe.
All the Falken table does is give you a theoretical minimum ‘safe’ pressure for a given load and tyre load rating. It does not take into account tuning tyre pressure with suspension, economy, comfort, road surface, environmental conditions etc. For my van their pressures are far too low and would result in very uneven tyre wear, poor economy and a bouncy ride from the undamped ‘suspension’ of the tyre.
