can different tyres be fitted to an existing

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can different tyres be fitted to an existing

Post by samleeds on Thu Dec 01, 2016 6:41 pm

My tyres are 195/70 r15 c 102/104 the load rating of 102 gives me 850kg. the max load rating for these tyres are 104 which is 900kg per tyre so I am looking to buy tyres with a load rating of 110 but it looks like i need to go up a grade or size. Has anyone got any ideas as my existing tyres are near the limit and I want to play it safe and make sure im well in on the weight and load bearing capacities.


Hopefully we all wont get bogged down with why how and why are you doing this,,,,,, suffice it to say I like to be safe and sound and my mechanic tells me that you need to be running below 90% of your load rating and no more which gives me cause for concern.

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Re: can different tyres be fitted to an existing

Post by PLOUGHLIN on Thu Dec 01, 2016 7:38 pm

Having had a quick google, I doubt you you will find a higher load rating for a 15 tyre, you will need to change wheel size to 16.

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Re: can different tyres be fitted to an existing

Post by daisy mae on Thu Dec 01, 2016 7:43 pm

If you altered your tyres to go larger  aren`t you going to alter the mileage shown on the dashboard. also the gear ratio.? just a mere female driver asking.

Never find out anything if you don`t ask.   shrugg
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Re: can different tyres be fitted to an existing

Post by samleeds on Thu Dec 01, 2016 7:43 pm

This might sound daft, but can I have 16's on the back and 15.s on the front because 16,s on the front will put more pressure on the gear box wont it. Or will it be negligible. Basic physics tells me that a larger wheel will give me more speed as one revolution of a 16 is more than one of a 15

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Re: can different tyres be fitted to an existing

Post by samleeds on Thu Dec 01, 2016 7:45 pm

daisy mae wrote:If you altered your tyres to go larger  aren`t you going to alter the mileage shown on the dashboard. also the gear ratio.? just a mere female driver asking.

Never find out anything if you don`t ask.   shrugg
Ha Ha I was writing my reply when you posted this, we are thinking on the same lines, lol.

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Re: can different tyres be fitted to an existing

Post by PLOUGHLIN on Thu Dec 01, 2016 8:09 pm

Yes a 16 wheel will give a bigger overall diameter unless the profile is very small, in which case you won't get the load rating. This will make the speedo/milometer under read, (and also invalidate your insurance unless you advise of the change, they might then not insure you).

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Re: can different tyres be fitted to an existing

Post by samleeds on Thu Dec 01, 2016 11:05 pm

If there was 15's on the front and 16's on the back, the speedo stays the same and the load is far safer. I have seen cars with bigger back wheels so why not a camper. Is it illegal, I dont know.

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Re: can different tyres be fitted to an existing

Post by PLOUGHLIN on Thu Dec 01, 2016 11:39 pm

No idea if it is legal or if MOT problems would occur, but I suspect your insurance co would decline your business when you tell them.

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Re: can different tyres be fitted to an existing

Post by matchlessman on Fri Dec 02, 2016 9:02 am

It might be worth checking Volkswagons recommendations. If they point you in a direction the insurance etc should not be a problem.

Things can get difficult when upgrading as it might be difficult to prove that the 'improvement' you made didn't contribute if you are involved in an accident. 

Insurance companies usually ask you to confirm if any modifications have been carried out. My motorbike insurance even ask if I've changed the handlebars??
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Re: can different tyres be fitted to an existing

Post by rogerblack on Fri Dec 02, 2016 9:04 am

samleeds wrote:If there was 15's on the front and 16's on the back, the speedo stays the same and the load is far safer. I have seen cars with bigger back wheels so why not a camper. Is it illegal, I dont know.
Would you be able to carry two spares?  scratch head
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Re: can different tyres be fitted to an existing

Post by peugeotboxer on Fri Dec 02, 2016 9:31 am

PLOUGHLIN wrote:No idea if it is legal or if MOT problems would occur

According to the Testers manual, the only real stipulation is that you can't mix tyres on the same axle. (ie. crossply and radial)

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Re: can different tyres be fitted to an existing

Post by dbroada on Fri Dec 02, 2016 9:45 am

rogerblack wrote:
samleeds wrote:If there was 15's on the front and 16's on the back, the speedo stays the same and the load is far safer. I have seen cars with bigger back wheels so why not a camper. Is it illegal, I dont know.
Would you be able to carry two spares?  scratch head
My original Smart had different sized wheels front & back and no spare. The local tyre fitters stocked one of each size for emergencies and had to order in extras if you needed both wheels at one end.

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Re: can different tyres be fitted to an existing

Post by matchlessman on Fri Dec 02, 2016 12:26 pm

Many cars now have a spacesaver which is considerably smaller (width and diameter) than the standard fitment.

Whilst it will undoubtedly upset the balance when doing an emergency stop and it's hard to imagine cornering hard with one, the main issue is that it interferes with traction control and ABS systems, which is why they are limited to 50 mph (ish).

They also make cars look lopsided and stupid..........
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Re: can different tyres be fitted to an existing

Post by rogerblack on Fri Dec 02, 2016 12:53 pm

Are space  savers suitable for commercial vehicle bases?
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Re: can different tyres be fitted to an existing

Post by samleeds on Fri Dec 02, 2016 1:00 pm

After a great deal of research and after speaking to tyre specialists, the police and insurance, the mixing of sizes isnt illegal. I can put 16's on the back to safeguard load bearing issues and leave 15's on the front. these are legal as long as the tyres are the same on both sides of the axle. On the issue of carrying 2 spares, this isnt necessary as some spares today are the smaller than normal inflatables but they did say that driving on a different size for any length of time will invalidate insurance if im involved in an accident, but to just get me home or to the nearest garage is fine.

If i change up to 16's from 15's, VW say that the van and the speedo will show a slight difference but only maybe 4mph which suits me as my speedo is calculated 5mph slower than my sat nav anyway but as for the gearbox ratios, they maintain the extra load for one size tyre will be negligible and safe as long as I am not running a special warranty programme, which i am not as the vans old.

Ive decided to shop around and buy a set of t5 transporter 16 inch wheels and tyres and keep the existing tyres in case I sell and remove the scooter from the back. Now we all know the answers.

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Re: can different tyres be fitted to an existing

Post by Gromit on Fri Dec 02, 2016 1:19 pm

Have you got ramps for the front?? You'll be rolling out of bed without them! snigger

I jest of course, but many vans are already low at the front and bigger rear wheels won't help. It just might make enough difference to be uncomfortable?

Just an idle thought.

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Re: can different tyres be fitted to an existing

Post by samleeds on Fri Dec 02, 2016 2:45 pm

Gromit wrote:Have you got ramps for the front?? You'll be rolling out of bed without them! snigger

I jest of course, but many vans are already low at the front and bigger rear wheels won't help. It just might make enough difference to be uncomfortable?

Just an idle thought.

My van is the direct opposite. if i park on a dead level surface, my rears need to be on the first level of my ramps. Getting 16's wont make any difference anyway, it just depends on the profile of the tyre. 15's with a high side wall are exactly the same as 16' with a lower wall depth which keeps the gearbox and speedo the exact same. My mechanic is on it now so we will see what he comes up with.

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Re: can different tyres be fitted to an existing

Post by samleeds on Fri Dec 02, 2016 4:16 pm

Sapper just came up with a belting simple idea. Why not use a 205 tyre that has a 109 load bearing profile and sits on a 15 inch rim. No need to buy new rims now, job done, lol. simple.

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Re: can different tyres be fitted to an existing

Post by PLOUGHLIN on Fri Dec 02, 2016 4:41 pm

If you can find one, great. 65 profile slightly smaller, 70 profile slightly larger than original. Quick google 106 looks highest.

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Re: can different tyres be fitted to an existing

Post by samleeds on Fri Dec 02, 2016 4:47 pm

PLOUGHLIN wrote:If you can find one, great. 65 profile slightly smaller, 70 profile slightly larger than original. Quick google 106 looks highest.
My mechanics found 225 70 r 15 with 112 load ratio. Im going tomorrow to see if the space is there as i will need to have a half an inch on each side of the tyre and Im pretty sure there is loads of room at the back.

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Re: can different tyres be fitted to an existing

Post by PLOUGHLIN on Fri Dec 02, 2016 5:48 pm

Ah, you said 205 previously. The 225/70 will be 42mm larger than original. Does the 225 fit the old rim width safely?

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tyre size

Post by gonromin on Fri Dec 02, 2016 5:57 pm

samleeds wrote:My tyres are 195/70 r15 c 102/104 the load rating of 102 gives me 850kg. the max load rating for these tyres are 104 which is 900kg per tyre so I am looking to buy tyres with a load rating of 110 but it looks like i need to go up a grade or size. Has anyone got any ideas as my existing tyres are near the limit and I want to play it safe and make sure im well in on the weight and load bearing capacities.


Hopefully we all wont get bogged down with why how and why are you doing this,,,,,, suffice it to say I like to be safe and sound and my mechanic tells me that you need to be running below 90% of your load rating and no more whi 

Hi , First check with VW at Milton Keynes Technical to find out what sizes tyres you can fit on your standard wheel. When you have found this out You will know which tyre sizes are available to you on your wheels.
Gren.
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VWT4 tyre sizes

Post by Gatcombeman on Tue Jan 17, 2017 4:15 pm

I have just come across this thread having been off line for a while. All very interesting. The tyre size for the T4 was 195/70/R15 102/104. The only alternative according to my T4 handbook and the VWT4 forum site is 205/65/15 which VW state is a recommended winter tyre size. The difference in overall wheel size is less than 1% making little difference to speedo readings etc. You can get 205/65/15 tyres correctly load rated at 104 i.e 900kgs.. I researched this the last time I replaced the tyres on my 2003 Gatcombe. They will need to be replaced later this year or early next. I am planning to fit alloy wheels with 205/65/15 104 tyres. The problem with a 16 inch wheel is the load rating and overall size etc. The earlier Clubmans may be different as they have lighter axle loadings. The Gatcombe/Clubman have 1600kgs front and 1800kgs rear axle loading hence the need for 104 rated tyres.
I would be interested to hear from any Gatcombe/Clubman owners who have alloy wheels fitted to their vans whether original factory wheels or aftermarket wheels.
I hope you don't mind me reviving an old post. gimmefive

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Re: can different tyres be fitted to an existing

Post by logburner on Tue Jan 17, 2017 8:30 pm

Each to their own on tyres........Clubman.
But, my revenue rating is 2890kg.
Front axle...1430 kg.       Rear axle....1460kg.
At 1460kg. Two wheels at 730 kg each maximum.
Safety margin @ 10 percent is 803kg, or even 20 percent is 876 kg.
At 104/102 load rating gives 900kg/850 kg...giving a minimum margin of 16 percent for safety.
Mind you, l except that you could have a higher rated chassis than mine. Or, my figures could be wrong, not unknown. shruggscratch head
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Re: can different tyres be fitted to an existing

Post by samleeds on Wed Jan 18, 2017 9:50 am

After consulting loads of people and organisations, my mechanic fitted 215/70 r 15's to her which means I am now well inside the safety zone. I think the difference in load bearing capabilities is 100kg extra per tyre. Im happy and the ride is identical.

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