The MGF Register Forums

Fraser wrote:Adrian, many thanks for your reply. Of course Jaguar also recommend tyres for my XJ6, and I actually have the recommended tyres fitted, (this time !!). However, there is never any "doom" warnings about other makes. Of course some are noisier or don't grip so well. For instance I had two Accelara Phi's on the back when I bought the car, and these lasted pretty well, and I didn't have much to complain about, so when they wore out, I fitted another pair.

Anyway, I think I am going to do something about the single Continental on the RH rear this summer. All the other tyres are the original Goodyear GSD2s.

PeteC wrote:As far as I know, it is highly unusual for a manufacturer to issue a techical bulletin worded as strongly as this. Has anyone explored the insurance aspect of not using the Goodyear GSD2 (THE only recommended tyre - even though you can't get them any more!) or the alternative Falken or Toyo? If you had a serious accident using Michelins or Dunlops or Yokohamas for example, would you be in breach of you insurance terms and conditions?
Just a thought!
Pete

colintf wrote:

Fraser wrote:Adrian, many thanks for your reply. Of course Jaguar also recommend tyres for my XJ6, and I actually have the recommended tyres fitted, (this time !!). However, there is never any "doom" warnings about other makes. Of course some are noisier or don't grip so well. For instance I had two Accelara Phi's on the back when I bought the car, and these lasted pretty well, and I didn't have much to complain about, so when they wore out, I fitted another pair.

Anyway, I think I am going to do something about the single Continental on the RH rear this summer. All the other tyres are the original Goodyear GSD2s.

how old is the car, if they are origional tyres and 10 years old or more then they should all be changed

PeteC wrote:That's what I meant! Hopefully not in the interests of safety.
Pete

Several MGF and TF owners have recently reported handling and stability issues when replacing worn Toyo Proxes T1R tyres. The problems have all arisen when they change the tyres on the rear of their car with identical new Toyo Proxes T1R tyres, leaving their less-worn older Proxes T1R tyres on the front. After a tyre change of this nature the cars become very unstable, especially at speeds above approximately 45mph. This phenomenon was first seen in October 2014. Tyre pressures were not to blame, so this pointed to an issue related to the new tyres. Following discussions with Toyo's Technical Department, the source of the problem has been quickly identified and a solution found. Basically, Toyo have had to apply some very small changes to the tyre make-up to ensure compliance with the Tyre Labelling Regulations.

Unfortunately the small changes involved are enough to affect the MGF and TF and are generating the loss of stability. The new spec tyres are all Proxes T1R tyres manufactured in Toyo’s Malaysian factory and the Proxes T1R tyres made in their Japanese factory from September 2014. All tyres supplied and fitted to cars up to September 2014 will have been made in the Japanese plant and will be to the older specification. Identifying the tyres is quite simple as the country of origin is clearly moulded into one sidewall along with a date code with a four digit number. The last two numbers of this code are the year and the first two are the calendar week. There is often a prefix of letters and sometimes an additional number before the date code numbers, for example KEP2511, with KEP as prefix and 2511 referring to week 25 of 2011.

MGF and TF generate more wear on rear tyres. so owners will be facing renewal of the rear tyres before the front. While it is reasonable for owners to expect that replacing the worn tyres with new identical (as they believe) MG-approved tyres will not create problems, the new spec Proxes T1R (ie all tyres made in Malaysia and those made in Japan from September 2014) will. When fitted to the rear with the earlier spec Japanese made Proxes T1Rs remaining on the front, almost certainly the problems described will occur. However. if the front tyres are replaced with the newer spec Proxes T1R to match the rear, the handling should return to normal. The final important point is to ensure that the correct tyre pressures are set.

Mykel wrote:I’ve made up a little summary of the article (abridged and with slightly changed wording), so if the scanned image causes problems, here’s the essential information:

Several MGF and TF owners have recently reported handling and stability issues when replacing worn Toyo Proxes T1R tyres. The problems have all arisen when they change the tyres on the rear of their car with identical new Toyo Proxes T1R tyres, leaving their less-worn older Proxes T1R tyres on the front. After a tyre change of this nature the cars become very unstable, especially at speeds above approximately 45mph. This phenomenon was first seen in October 2014. Tyre pressures were not to blame, so this pointed to an issue related to the new tyres. Following discussions with Toyo's Technical Department, the source of the problem has been quickly identified and a solution found. Basically, Toyo have had to apply some very small changes to the tyre make-up to ensure compliance with the Tyre Labelling Regulations.

Unfortunately the small changes involved are enough to affect the MGF and TF and are generating the loss of stability. The new spec tyres are all Proxes T1R tyres manufactured in Toyo’s Malaysian factory and the Proxes T1R tyres made in their Japanese factory from September 2014. All tyres supplied and fitted to cars up to September 2014 will have been made in the Japanese plant and will be to the older specification. Identifying the tyres is quite simple as the country of origin is clearly moulded into one sidewall along with a date code with a four digit number. The last two numbers of this code are the year and the first two are the calendar week. There is often a prefix of letters and sometimes an additional number before the date code numbers, for example KEP2511, with KEP as prefix and 2511 referring to week 25 of 2011.

MGF and TF generate more wear on rear tyres. so owners will be facing renewal of the rear tyres before the front. While it is reasonable for owners to expect that replacing the worn tyres with new identical (as they believe) MG-approved tyres will not create problems, the new spec Proxes T1R (ie all tyres made in Malaysia and those made in Japan from September 2014) will. When fitted to the rear with the earlier spec Japanese made Proxes T1Rs remaining on the front, almost certainly the problems described will occur. However. if the front tyres are replaced with the newer spec Proxes T1R to match the rear, the handling should return to normal. The final important point is to ensure that the correct tyre pressures are set.

hth

PeteC wrote:And I've removed the scanned copy. The edit refers to Mykel's contribution. Full copy available by PM.
Pete