Ouch!! (Tyres)

[barryd]

I have had a reply from Conti. My email last night must have prompted them to look at my previous email and request for advice.

This is there reply.

Based on the 225/75 R16 CP 116R and providing that the weights given are the maximum axle weight you will be subjecting the tyre to; the inflation pressure guidance is:



Front: 1800kgs- 3.25 bar (47.1 psi)

Rear (Single fitment): 2200kgs- 4.75bar (79 psi)

Rear (Twin Fitment): 2200kgs- 3.0bar (43.5psi)



I have highlighted the info you should refer to in yellow and then look at the top of the page for the inflation pressure in bar.

Also, you need to know that,

FA S means Front axle single fitment.

RA S means Rear axle single fitment.

RA T means Rear axle with twin tyre fitment.



There are some variations in pressures given from different sources. The reason for the confusion and higher pressure from some sources on the rear is because the ETRTO (European Tyre & Rim Technical Organisation) in their standards manual have a paragraph that suggests all CP type tyres fitted as single fitment rear tyres on a camper should be inflated to a minimum of 5.5 bar (79 psi), even if the load on the axle is such that the inflation requirement based on the standard ETRTO tables and manufacturer data is lower. This advice is because of the likelihood of overloading or uneven load distribution in camper applications and the need to compensate for this with a higher inflation pressure.

Our current stance remains unchanged when calculating recommended pressures which is directly calculated from the given loads provided by yourself against the pressure recommendations in the technical data book and this is the information we provide.

However, given the information in the ETRTO manual we give this pressure as a guide and should only be used on the understanding that no single tyre will be overloaded, and the axle loads given will not be exceeded.



If you have any questions, please do not hesitate to call or email.



I also emailed my garage who fitted the tyres and they just said they go on the guidance recommended by Kimberley Caravans but would not recommend going down to anything under 75 psi all round.

The ride is harsh but by the sound of it I shouldnt lower the PSI on the rear but the jury is out on the front.

On a separate issue I thought I was going to have to call breakdown on the way down as I got an awful howling from the rear wheels when I got tangled up in some traffic in a diversion. I have noticed it before now and again but not as loud as this. I pulled the handbrake on and off and it went off. Did that a couple of times in traffic and for the last 60 miles it was fine. I stopped and checked for heat in the wheels and they were fine so its a bit of a mystery what that is but should get it checked. They weren't binding as the van rolled perfectly on a very slight incline.

 

[alcam]

I have had a reply from Conti. My email last night must have prompted them to look at my previous email and request for advice.

This is there reply.

Based on the 225/75 R16 CP 116R and providing that the weights given are the maximum axle weight you will be subjecting the tyre to; the inflation pressure guidance is:



Front: 1800kgs- 3.25 bar (47.1 psi)

Rear (Single fitment): 2200kgs- 4.75bar (79 psi)

Rear (Twin Fitment): 2200kgs- 3.0bar (43.5psi)



I have highlighted the info you should refer to in yellow and then look at the top of the page for the inflation pressure in bar.

View attachment 141633





Also, you need to know that,

FA S means Front axle single fitment.

RA S means Rear axle single fitment.

RA T means Rear axle with twin tyre fitment.



There are some variations in pressures given from different sources. The reason for the confusion and higher pressure from some sources on the rear is because the ETRTO (European Tyre & Rim Technical Organisation) in their standards manual have a paragraph that suggests all CP type tyres fitted as single fitment rear tyres on a camper should be inflated to a minimum of 5.5 bar (79 psi), even if the load on the axle is such that the inflation requirement based on the standard ETRTO tables and manufacturer data is lower. This advice is because of the likelihood of overloading or uneven load distribution in camper applications and the need to compensate for this with a higher inflation pressure.

Our current stance remains unchanged when calculating recommended pressures which is directly calculated from the given loads provided by yourself against the pressure recommendations in the technical data book and this is the information we provide.

However, given the information in the ETRTO manual we give this pressure as a guide and should only be used on the understanding that no single tyre will be overloaded, and the axle loads given will not be exceeded.



If you have any questions, please do not hesitate to call or email.



I also emailed my garage who fitted the tyres and they just said they go on the guidance recommended by Kimberley Caravans but would not recommend going down to anything under 75 psi all round.

The ride is harsh but by the sound of it I shouldnt lower the PSI on the rear but the jury is out on the front.

On a separate issue I thought I was going to have to call breakdown on the way down as I got an awful howling from the rear wheels when I got tangled up in some traffic in a diversion. I have noticed it before now and again but not as loud as this. I pulled the handbrake on and off and it went off. Did that a couple of times in traffic and for the last 60 miles it was fine. I stopped and checked for heat in the wheels and they were fine so its a bit of a mystery what that is but should get it checked. They weren't binding as the van rolled perfectly on a very slight incline.

HANDBRAKE THREAD ALERT

 

[Nabsim]

See, sensible info from Conti instead of hiding behind a catch all H&S figure. If you use figures that are true you are safe. I still use the pressures from when the van was plated at 4 tones but ride is fine, different size rims and tyres and now 3.500 gross but 60 psi does me. I am also rear wheel drive though

 

[yeoblade]

I have had a reply from Conti. My email last night must have prompted them to look at my previous email and request for advice.

This is there reply.

Based on the 225/75 R16 CP 116R and providing that the weights given are the maximum axle weight you will be subjecting the tyre to; the inflation pressure guidance is:



Front: 1800kgs- 3.25 bar (47.1 psi)

Rear (Single fitment): 2200kgs- 4.75bar (79 psi)

Rear (Twin Fitment): 2200kgs- 3.0bar (43.5psi)



I have highlighted the info you should refer to in yellow and then look at the top of the page for the inflation pressure in bar.

View attachment 141633





Also, you need to know that,

FA S means Front axle single fitment.

RA S means Rear axle single fitment.

RA T means Rear axle with twin tyre fitment.



There are some variations in pressures given from different sources. The reason for the confusion and higher pressure from some sources on the rear is because the ETRTO (European Tyre & Rim Technical Organisation) in their standards manual have a paragraph that suggests all CP type tyres fitted as single fitment rear tyres on a camper should be inflated to a minimum of 5.5 bar (79 psi), even if the load on the axle is such that the inflation requirement based on the standard ETRTO tables and manufacturer data is lower. This advice is because of the likelihood of overloading or uneven load distribution in camper applications and the need to compensate for this with a higher inflation pressure.

Our current stance remains unchanged when calculating recommended pressures which is directly calculated from the given loads provided by yourself against the pressure recommendations in the technical data book and this is the information we provide.

However, given the information in the ETRTO manual we give this pressure as a guide and should only be used on the understanding that no single tyre will be overloaded, and the axle loads given will not be exceeded.



If you have any questions, please do not hesitate to call or email.



I also emailed my garage who fitted the tyres and they just said they go on the guidance recommended by Kimberley Caravans but would not recommend going down to anything under 75 psi all round.

The ride is harsh but by the sound of it I shouldnt lower the PSI on the rear but the jury is out on the front.

On a separate issue I thought I was going to have to call breakdown on the way down as I got an awful howling from the rear wheels when I got tangled up in some traffic in a diversion. I have noticed it before now and again but not as loud as this. I pulled the handbrake on and off and it went off. Did that a couple of times in traffic and for the last 60 miles it was fine. I stopped and checked for heat in the wheels and they were fine so its a bit of a mystery what that is but should get it checked. They weren't binding as the van rolled perfectly on a very slight incline.

Top Hat rear discs, so the shoes work on the drum only for the handbrake and dont really clean themselves as they're only used when stationary, driving along slowly and pulling on handbrake can clean the drum surface up and solve some problems sometimes

 

[barryd]

Top Hat rear discs, so the shoes work on the drum only for the handbrake and dont really clean themselves as they're only used when stationary, driving along slowly and pulling on handbrake can clean the drum surface up and solve some problems sometimes

I don't know what that means but it don't sound like Armageddon at least.

 

[Canalsman]

I don't know what that means but it don't sound like Armageddon at least.

The rear brake discs look like a top hat with its top missing.. The 'brim' is the surface on which the pads bear. The inside of the top hat is the brake drum on which the handbrake linings bear.

I have the same awful noise on occasion which usually clears by itself. As @yeoblade says applying the handbrake a few times whilst moving slowly also helps.

 

[barryd]

The rear brake discs look like a top hat with its top missing.. The 'brim' is the surface on which the pads bear. The inside of the top hat is the brake drum on which the handbrake linings bear.

I have the same awful noise on occasion which usually clears by itself. As @yeoblade says applying the handbrake a few times whilst moving slowly also helps.

Is there a fix? Thanks though as that sounds reassuring.

 

[Canalsman]

Is there a fix? Thanks though as that sounds reassuring.

Only that which has been suggested.

 

[rustydog]

Vans in for MOT. Its passed but all four tyres are cracking at the sides. They are the continental camping tyres but all of them are ten years old so they have recommended replacing them. £230 each!! Ive said go ahead as I really have no choice. I've seen debates about whether normal van tyres will do and obviously they will likely be £100 cheaper each but with it being a 4.25t van, carrying the scooter etc and also stood for months on end I guess its probably best to have the best tyres suited for the job.

What with the service and MOT on top thats my day ruined.

Try Goodyear cargo tyres a lot cheaper and give a good ride it's all in a name you won't be disappointed

 

[barryd]

Only that which has been suggested.

So is it pointless me taking it into that garage then? Just apply the handbrake a bit if it happens? It's a bit worrying that's all. It sounded dreadful yesterday but I've heard it before but not as loud as it was yesterday

 

[Canalsman]

So is it pointless me taking it into that garage then? Just apply the handbrake a bit if it happens? It's a bit worrying that's all. It sounded dreadful yesterday but I've heard it before but not as loud as it was yesterday

Have you had the brakes checked since you bought the 'van?

If not it might be sensible to get your, hopefully well skilled, garage to do a complete health check.

 

[barryd]

Have you had the brakes checked since you bought the 'van?

If not it might be sensible to get your, hopefully well skilled, garage to do a complete health check.

Its just had a service when they did the four new tyres so I would like to think they checked them. Will mention it to them. It had a full service by the previous owner last April as well.

 

[trevskoda]

Its just had a service when they did the four new tyres so I would like to think they checked them. Will mention it to them. It had a full service by the previous owner last April as well.

Never trust bits of paper saying services done, or folk who tell you this, when i boughr my proton car it came with 5 service sheets, every one was bull as when i went over it nothing had been done, rusty oil filter and s plugs, back wheel missing grease cap and drivers side bearing gave in after a thu miles, when i tried removing the r wheels they were almost one with the hubs, to many chancers out there, well here to be truthfull, lucky the car cost me buttons.

 

[barryd]

So 150 miles home this morning and no repeat episodes of the horrible wailing noise from the rear wheels. Im always a bit sceptical of things that just seem to fix themselves though so not sure what to do about it now.

As for the tyres. Im a little bit disappointed with the ride and not sure what to do about that either. I have conflicting opinions from Conti and my garage. If you reduce any tyre pressure then Conti seem to be of the opinion that it should be the front but I don't think lowering it to what they suggested on that email is a good idea. I was thinking of trying 70 psi on the front and 79 on the back. Not only is the ride harsh and rattly but I don't think its as stable as it was on the old tyres but there is a good chance they had lost some pressure. Front just feels a tad lighter. On the plus side I managed 25+ mpg over the Trip to Merls which whilst you might thing thats not very good for the size of the van and the way I drive Im pleased with that. Generally 70mph+ most of the time (indicated)

 

[Nabsim]

Why don't you trust the tyre manufacturer, they have a lot more expertise and testing than your garage or even the tyre places. When I was having mine fitted I showed the email I had from Conti to them and they said it was fine, Conti knew better

 

[trevskoda]

So 150 miles home this morning and no repeat episodes of the horrible wailing noise from the rear wheels. Im always a bit sceptical of things that just seem to fix themselves though so not sure what to do about it now.

As for the tyres. Im a little bit disappointed with the ride and not sure what to do about that either. I have conflicting opinions from Conti and my garage. If you reduce any tyre pressure then Conti seem to be of the opinion that it should be the front but I don't think lowering it to what they suggested on that email is a good idea. I was thinking of trying 70 psi on the front and 79 on the back. Not only is the ride harsh and rattly but I don't think its as stable as it was on the old tyres but there is a good chance they had lost some pressure. Front just feels a tad lighter. On the plus side I managed 25+ mpg over the Trip to Merls which whilst you might thing thats not very good for the size of the van and the way I drive Im pleased with that. Generally 70mph+ most of the time (indicated)

56,ph is what most veh are set to be best on fuel, try lighter boots.

 

[barryd]

Why don't you trust the tyre manufacturer, they have a lot more expertise and testing than your garage or even the tyre places. When I was having mine fitted I showed the email I had from Conti to them and they said it was fine, Conti knew better

47 PSI on the front running at 1800kg though and 79psi on the back? Thats what they said. Seems a huge difference.

 

[TJBi]

47 PSI on the front running at 1800kg though and 79psi on the back? Thats what they said. Seems a huge difference.

I think that you may find that there is a typo in their figure for the old, outdated units. 4.75 bar as shown in the table for your figure of 2200 kg on the rear axle equates, I believe, to 69 psi, not 79 psi.

 

[colinm]

47 PSI on the front running at 1800kg though and 79psi on the back? Thats what they said. Seems a huge difference.

If you look at Conti's chart for your tyre and the maximum front axle load of your van of 2100kg, then 58psi covers that, although Tyresafe say 62psi, so 60psi should ensure you don't have any problems even if you carry much more than you do at present.

 

[barryd]

So maybe go with 65 on the front and 69 on the back then just to be safe?