Lexus ISF / IS-F / LFA / LF-A  Forum banner
21 - 40 of 44 Posts

·
Registered
Joined
·
100 Posts
A couple questions, but mostly likely I'll be told to buy wider rims :S

1) Michelin web site shows the 275 width to fit a 9" to 10" rim. They make it in 30 and 35 profiles, but one is 2% larger and the other 2% smaller than stock. Which would be the better fit on our stock 19x9 rims?

2) Would the little bit extra width of the 275 be worth shoe horning it on the stock rims vs the 255 or 265? I really don't want to lose any handling performance at the track.

3) I know this contradicts the question above. They don't make a 285(which seems to work for the Cont. DW), but the 295 may fit... Anyone have some thoughts on this?
 

·
Registered
Joined
·
158 Posts
IF you want maximum performance/handling, stick with the sizes that are approved for your factory wheels.

If you want to plus size I suggest going with 245/35-19's in the front with size 275/30-19 in the rear.
Surprised that you say this. The feedback of the forum members is that if you go with 245/35-19 and 275/30-19 gives better handling than the original setup. Do you believe the original setup gives better handling or have I misunderstood?
 

·
Registered
Joined
·
100 Posts
I am also wondering the same thing. Maybe the larger tires squirm a tad more on the track and most of the forum members just want more straight line rear wheel grip?

This still seems unclear... Michelin does say the 275 fits on a 9".
 

·
Premium Member
Joined
·
136 Posts
Discussion Starter · #25 ·
Surprised that you say this. The feedback of the forum members is that if you go with 245/35-19 and 275/30-19 gives better handling than the original setup. Do you believe the original setup gives better handling or have I misunderstood?
The first sentence in my last reply was worded wrong. I apologize for the confusion on that.

The wider sizes will certainly help with handling/performance. What I meant to put across is that if you are going to go with a wider plus zero set up, go with tire sizes that are approved for the intended wheels.
 

·
Premium Member
Joined
·
154 Posts
IF you want maximum performance/handling, stick with the sizes that are approved for your factory wheels.

If you want to plus size I suggest going with 245/35-19's in the front with size 275/30-19 in the rear.
I'm running 255/35-19's in the front with 285/30-19 in the rear (from Discount Tire) and haven't had any issues (stock wheels). Why do you recommend the smaller sizes?
 

·
Premium Member
Joined
·
712 Posts
^
Tire size 285/30-19 will perform best on rim that has a width from 9.5" to 10.5". Tire size 275/30-19 will perform best on a rim that has a width from 9.0" to 10".
I disagree, as I have in the past with your recommendation. I am running the 285/30/19 Continental DW on the back, and the tire puts down a contact patch that covers the full width of the tread. (see picts attached). There is no tire bulge and the handling is greatly improved over the stock PS2s. IMO, the 275/30/19 is too short vs the stock 255/35 tire. A 295/30 would be the correct tire OD, but IMO, would be too wide for the stock wheel. As I explained to you before, I had my tires installed by a Discount Tire store, and all this was discussed with store management, and they agree with me. I know the tire makers don't recommend this installation, but take it from someone with experience, it works and there is no downside.

Lou
 

Attachments

·
Registered
Joined
·
38 Posts
I disagree, as I have in the past with your recommendation. I am running the 285/30/19 Continental DW on the back, and the tire puts down a contact patch that covers the full width of the tread. (see picts attached). There is no tire bulge and the handling is greatly improved over the stock PS2s. IMO, the 275/30/19 is too short vs the stock 255/35 tire. A 295/30 would be the correct tire OD, but IMO, would be too wide for the stock wheel. As I explained to you before, I had my tires installed by a Discount Tire store, and all this was discussed with store management, and they agree with me. I know the tire makers don't recommend this installation, but take it from someone with experience, it works and there is no downside.

Lou
This is probably a stupid question, but are the 2011 stock wheels the same sizes as the previous ISF's ('08-'10) wheels? Also, would your experience with the Conti's in the 285 width tires in the rear vs. the stock tire 255 width (ie. improved performance) be directly applicable to the PSS's... or since they are different tires (but come in the same size) would they fit and or possibly have worse performance than the smaller 275 tire recommended by the direct tire rep? As always.. .TIA!! ;) (I'm seriously considering getting of rid of my Potenzas that only have 3500 miles on them for the PSS's and if I'm understanding all the posts right, it seems that wider is generally better for performance (to a point obviously). LOL (you also say there is "no downside", but is there any theoretical or possibly observable downside to going with the 285 and 255 combo compared to the stock sizes??? I'm sorry for my newbie questions.....
 

·
Registered
Joined
·
38 Posts

·
Premium Member
Joined
·
712 Posts
This is probably a stupid question, but are the 2011 stock wheels the same sizes as the previous ISF's ('08-'10) wheels? Also, would your experience with the Conti's in the 285 width tires in the rear vs. the stock tire 255 width (ie. improved performance) be directly applicable to the PSS's... or since they are different tires (but come in the same size) would they fit and or possibly have worse performance than the smaller 275 tire recommended by the direct tire rep? As always.. .TIA!! ;) (I'm seriously considering getting of rid of my Potenzas that only have 3500 miles on them for the PSS's and if I'm understanding all the posts right, it seems that wider is generally better for performance (to a point obviously). LOL (you also say there is "no downside", but is there any theoretical or possibly observable downside to going with the 285 and 255 combo compared to the stock sizes??? I'm sorry for my newbie questions.....
Yes the specifications for the late stock wheels, width, offset are the same as the earlier wheels. They're even made by the same manufacturer, BBS.

For some unknown reason, Michelin does not make a performance non-runflat tire (none, nada) in the 285/30/19 size. I don't understand it:confused: And yes, I have found absolutely no downside with the 245/285 combo.

Some of our members have had good luck running the 245/275 combo. But, IMHO, the 275/30/19 is just a wee bit small in OD, but, that's just me. Again, IMHO, using a 255/35/19 on the front would be pushing it. It probably will work, but from my research, which was mostly just visual, I wouldn't do it.

Lou
 

·
Registered
Joined
·
38 Posts
For some unknown reason, Michelin does not make a performance non-runflat tire (none, nada) in the 285/30/19 size. I don't understand it:confused: And yes, I have found absolutely no downside with the 245/285 combo.

Some of our members have had good luck running the 245/275 combo. But, IMHO, the 275/30/19 is just a wee bit small in OD, but, that's just me. Again, IMHO, using a 255/35/19 on the front would be pushing it. It probably will work, but from my research, which was mostly just visual, I wouldn't do it.

Lou
I got confused when Grandpap said he was running 285's on the rear, as I thought he was referring to PSS's. When you say the 275/30/19 is "too small in OD", what would this affect? (would this small amount affect speedo accuracy much? what about performance?) I'm so confused right now as which PSS's would be best for my stock wheels. Should I just go with OEM sizing or is there a "wider" PSS that would fit and be better performance than that?
 

·
Premium Member
Joined
·
712 Posts
^^^^As I said, some members have had good luck with the 275s. The difference in OD between the three sizes is very small:

255/35/19 - 26" - stock size in PS2 or PSS
275/30/19 - 25.6" - for the PSS and 25.5" for the DW
285/30/19 - 25.7" - for the DW

Pretty small. You probably wouldn't notice the difference. All will work for you. Good Luck. Speedometer error is very very small.

Lou
 

·
Registered
Joined
·
38 Posts
Having the 245/35 and 275/30 PSS installed on the factory wheels by America's Tire and Newport Lexus installed brake pads & turned the rotors @ 25k miles. Looking forward to trying it all out!
I'm looking foward to hearing your experience with them and the sizes.
 

·
Registered
Joined
·
184 Posts
finally put mine on the other day after having them sit my in kitchen for 2 months lol
they feel a bit softer then the ps2's but only a tad, good for our sporty suspension
and the grip is very much what i remember when i had the new ps2s
road noise is about the same
tread life is better
I made the right choice in tire
got a great deal from discount tire direct
great customer service and quick shipping even to canada
will buy again, they are my tire store
 

Attachments

21 - 40 of 44 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top