I'm still deciding what tyres to put on my LS 400 17" dhp wheels, I need all five as I'm changing to a different size, due to expense and the age (2007) of my existing tyres. As usual I'm doing my research re noise , handling etc ( I probably overdo the research at times )
It occurred to me that I do low mileage (currently on 69000), so the next replacements may be needed due to age rather than mileage. I contacted Blackcircles and asked whether I could specify tyres with a very recent date (DOT number), to ensure that I get the maximum lifespan. Their response explained that they could not guarantee recent tyres, as they obtained tyres from many suppliers. They also explained that tyres sold as new can be up to five years old, by law. It seems to be the luck of the draw, but your new tyres may have been manufactured a month ago, or 59 months ago. Obviously, much depends on handling and storage (exposure to sunlight etc), but I imagine the process of perishing starts immediately. I'd bet this is not common knowledge. it probably is not an issue for people who do greater mileages, but for me, it could be.
By Ten Ninety
I am posting this for the information of other GS300h owners who are considering changing their tyres. Please learn from my own stupidity. Do not purchase Goodyear Eagle F1 Asymmetric 2 in size 235/45!
When looking at reviews, I found near-universal praise for these tyres (in other sizes) for being quiet, comfortable and low rolling resistance. Despite the fact that I know full well that tyre reviews are second only to food reviews for being utterly pointless subjective tripe, I allowed myself to be persuaded away from spending the extra on Michelin CrossClimates which have been recommended by owners on here. That was foolish, and it is going to prove to be an expensive mistake.
These tyres are not quiet. They produce noticeably more cabin noise than the OEM Bridgestone ER33s, which I did not consider to be a quiet tyre in the first place. They are perhaps more 'comfortable' in that they make the car feel as if it's driving through treacle. However, the biggest problem is that the rolling resistance is absolutely, utterly, appallingly terrible. Unbelievably, it has actually made a noticeable impact on performance - significantly more throttle is now required in any given situation, and the distance I can get in milkfloat mode has been considerably reduced. As a result, fuel economy is now catastrophically bad. I'm not talking a slight reduction - I'm talking a minimum 10% worse and on some journeys up to 20%. Where I would have been touching an indicated 50mpg on these cold days, I am now struggling into the low 40s and occasionally dipping down into the 30s. If I needed more proof that those ridiculous EU economy ratings are anything other than fabricated bulls--t then this is it - these tyres have the same rating as the ER33s they replaced, and the associated mumbo jumbo claims a maximum difference of 7.5% between A and G!
I hoped they might just need scrubbing in, but there's been no improvement after a few hundred miles. I have tried whacking the pressures up to 2.7bar, but this has had little impact on economy. It just makes the ride unsettled. And yes, I've checked they were fitted the right way around!
Clearly, these tyres can't be universally awful. I've actually got the Asymmetric 3s (the updated version) on my wife's Auris HSD and they're absolutely fine. However, on a GS300h they are an unmitigated disaster if you have even a passing interest in fuel economy. I hope this information may save others from making the same mistake as I have made.
Need some help and advice gents. So I've had enough of my OEM Bridgestones and wanted to change to the Michelin PS4s tyres all round. I thought I might as well upgrade the sizes from OEM to 245/35/19 fronts and 275/30/19 rears. Got to Costco today after ordering them a few days ago only to be told they refuse to fit them as the are not the manufactures recommended size and it will invalidate your insurance.
1st I've heard something like this as I'm sticking to the correct load and speed rating.
Any advice please? You guys who have upgraded the size told your insurance company?