Discussion
I'd change the SO2's if I were you as they are at the end of their useful life, if not beyond. Tyres have a 10 year max life bvefoire they go hard an start cracking. If you check carefully you'll probably see cracking in the valley of the tread and/or on tyhe sidewalls.
24 front, 26 rear is generally regarded as the optimum pressure but a couple of psi either way to suit you.
FFG
24 front, 26 rear is generally regarded as the optimum pressure but a couple of psi either way to suit you.
FFG
5.0ltr said:
All of the above.^^
The car would benefit from having the same tyres all round having heard the horror stories with mixed rubber on front/rear.
For road use I have Toyo Proxes T1R`s on mine at 24/26 psi. Excellant hardwearing tyre on the Griff.
+1 For Toyo Proxes. Give great levels of grip in mixed conditions and wouldn't put anything else on my 430. As the lads have said give your tyres a good check to see how they are but at that age would really recommend changing them.The car would benefit from having the same tyres all round having heard the horror stories with mixed rubber on front/rear.
For road use I have Toyo Proxes T1R`s on mine at 24/26 psi. Excellant hardwearing tyre on the Griff.
grngriff said:
Hi
The s02 are brand new,they were only manufatured in dec 2010, as were mich`s brand new but couldn't get the s02 in 15`s
take care then, the SO2 Pole Position (PP) tyres that were fitted to our cars were discontinued over 5 years ago to be replaced by SO3. The currently available SO2 are not PP and are intended for fitment to Porsche or something else. Apparently the sidewall is significantly harder, or something like that.The s02 are brand new,they were only manufatured in dec 2010, as were mich`s brand new but couldn't get the s02 in 15`s
If it's any help a 245/45/16 Bridgestone SO2 N3 has a similar load index and load rating as a Toyo T1R; which is 94 indicating 670kg (1477lbs) max load at 350 kPa (51psi) max pressure. The N3 code denotes the Bridgestone SO2 tyre is Porsche approved for their front engined 924, 944, 928 models and early rear engined 911s, and has, in comparison to the Pole Position variant, a softer compound.
I don't think you can get Toyos for the 15" front wheels with the correct speed rating anymore. You can get them for the next speed rating down (up to 149 mph I think) but from what I'm told if you have them on the car it may affect your insurance - in spite of the fact that we never drive faster than 70 mph!!
The only tyres I could find for the front 205/15 with the correct speed rating for the car were Dunlop SP9000 and I have Toyos on the back (24f 26r). The Dunlops are hard wearing tyres and seem fine to me.
The only tyres I could find for the front 205/15 with the correct speed rating for the car were Dunlop SP9000 and I have Toyos on the back (24f 26r). The Dunlops are hard wearing tyres and seem fine to me.
The Red Baron said:
I don't think you can get Toyos for the 15" front wheels with the correct speed rating anymore. You can get them for the next speed rating down (up to 149 mph I think) but from what I'm told if you have them on the car it may affect your insurance - in spite of the fact that we never drive faster than 70 mph!!
I believe a lot of `our` insurers are aware of this and acccept the fact, certainly mine, Mannings, were fine about the lower speed rating.grngriff said:
Thanks dave
Does that mean they are suitable for the griff,if they are as the toyos.
Sorry a little ignorant when it comes to cars that's why I got into tvrs so I could learn a little more
Thanks
From what I've read on this site the PH consensus is that Toyo T1Rs for 16" and 15" rims better suit the lightweight Griffith in terms of handling, this by virtue of less sidewall stiffness in comparison to the Porsche approved Bridgestone SO2. But Toyos do seem to need higher pressures to negate some of their sidewall softness. As for the suitability of the SO2 on a pre-cat Griffth, from my own personal experience, which is based on spirited road use, I've found the tyre works fine. Does that mean they are suitable for the griff,if they are as the toyos.
Sorry a little ignorant when it comes to cars that's why I got into tvrs so I could learn a little more
Thanks
Given a 245/45/16 Toyo T1R and SO2 have the same aspect ratio, speed rating and load index/rating, you'd be mistaken to think that sidewall stiffness would be the same but this is obviously not the case. Accurately quantifying the differences in sidewall stiffness would require sight of construction and compound specifications from the manufacturers and a view of a tyre in cross-section, so its down to you and what feels right on your car. I've contacted several UHP tyre manufacturers about tyre specs and the only 'detailed' response I got was that Porsche approved N3 tyres use a softer compound.
HTH
Having done 350 miles now with my new Toto T1R's on the rear and the existing T1S's on the front, I'm still not happy with how the back end feals...
I'm running 2 PSI over spec but have tried higher and lower... I've hammered them and had them hot on a number of runs now..... But still the back end appears to over run when going around a bend.. and on acceleration you can feel it shift from 1 wheel to the other.. Not nice at all...
May be they are better than when first fitted, but still not good.
I've had the geo set up and re-checked BTW...
I'm running 2 PSI over spec but have tried higher and lower... I've hammered them and had them hot on a number of runs now..... But still the back end appears to over run when going around a bend.. and on acceleration you can feel it shift from 1 wheel to the other.. Not nice at all...
May be they are better than when first fitted, but still not good.
I've had the geo set up and re-checked BTW...
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