285-35-19s Pirelli Trofeo R

[L99CAMA2011]

Just saw these 285-35-19s on Tire Rack and am thinking of using these on all 4 corners on 19x10.5" Apex wheels I have next year for track only wheels. What do you guys think.I have the street Pirelli P Zero 285-35-19 on my car now and it is as wide as the Bridgestone RE-11 305-30-19 but a bit taller. Also realize that Pirelli Trofeo Rs actually have wider threadwidth than advertise. http://www.tirerack.com/tires/tires....TRXL&tab=Specs.

[Norm Peterson]

I think it'd work rather well. Especially up front, where the first comparison that comes to mind is having an 0.8" narrower size than what the Z/28 wears, mounted on a wheel only 0.5" narrower.




I'm hoping to get up to Thompson or Palmer next year, but damn, you're not even going to let me see your taillights for more than a couple of corners with this.


Norm

[L99CAMA2011]

Originally Posted by Norm Peterson

I think it'd work rather well. Especially up front, where the first comparison that comes to mind is having an 0.8" narrower size than what the Z/28 wears, mounted on a wheel only 0.5" narrower.




I'm hoping to get up to Thompson or Palmer next year, but damn, you're not even going to let me see your taillights for more than a couple of corners with this.


Norm

um. Your actually a good driver with more track experience than me. But God knows. I am actually a huge fan of Limerock Park which I am going to on the 14th of November then hibernation time. Also I just noticed with my rims at 23+lbs and these tires at 27 lbs I should be at 51 lbs total fresh weight with air and tpms installed.

[Orange 2010 Camaro]

Originally Posted by L99CAMA2011

Just saw these 285-35-19s on Tire Rack and am thinking of using these on all 4 corners on 19x10.5" Apex wheels I have next year for track only wheels. What do you guys think.I have the street Pirelli P Zero 285-35-19 on my car now and it is as wide as the Bridgestone RE-11 305-30-19 but a bit taller. Also realize that Pirelli Trofeo Rs actually have wider threadwidth than advertise. http://www.tirerack.com/tires/tires....TRXL&tab=Specs.

Hello,

I have a 2010 SS/rs Camaro, and I would like to use the Apex wheels for track days as well.

Their web site shows that they can only be used on a BMW that has 12 BY 1.5 threaded wheel studs.

Did you have to en-large the clearance holes in the Apex wheels, to use them with the 14 mm. wheel studs on the Camaro?

Also, if you did, what did you use to enlarge them?

Also, did the 22mm. offset on the 19 BY 10.5 wheels work well on the front & rear as well?

Thank You so much for your help.

All The Best,

Orange 2010 Camaro

[JOHNSONROD]

http://www.tirerack.com/tires/tires....omCompare1=yes

[X25]

I did use APEX ARC-8 19"x10.5" ET22 at the track using 305/30/19 Hankook RS-3s ($220/tire at the time due to close-out) with no issues on Z/28 suspension, which is almost 1" lower than stock if I recall correctly. APEX wheels are very well made, and work pretty good on our cars. That said, they will stick out a bit, especially at the rear, so I'd highly recommend using either protective film on the sides of the body, or using fender flares.

With flares:


Without flares:
Rear/front

Side

Front

[L99CAMA2011]

Originally Posted by X25

I did use APEX ARC-8 19"x10.5" ET22 at the track using 305/30/19 Hankook RS-3s ($220/tire at the time due to close-out) with no issues on Z/28 suspension, which is almost 1" lower than stock if I recall correctly. APEX wheels are very well made, and work pretty good on our cars. That said, they will stick out a bit, especially at the rear, so I'd highly recommend using either protective film on the sides of the body, or using fender flares.

With flares:


Without flares:
Rear/front

Side

Front

Arc -8 are lighter than EC-7 but EC-7s are the stronger of the 2. Both work better than the TSW +27 offset wheels I had plus I swear the TSWs flex like heck. I hit a freaking Niagra fall type pothole 2 times on my way to work on 2 separate days and the driver side Apex EC-7 that suffered that impact is still true is a flat sheet of glass. I do however have the 285-35-19 Pzeros on that rim.

[L99CAMA2011]

Originally Posted by JOHNSONROD

http://www.tirerack.com/tires/tires....omCompare1=yes

When I get to the skill level to properly operate Hoosiers I will gladly get those.

[X25]

Originally Posted by L99CAMA2011

When I get to the skill level to properly operate Hoosiers I will gladly get those.

Hoosiers and Trofeo R are not that far apart, just so you know. I came very close to trying out Hoosiers on my car, but I just can't get over the fact that their load rating is severely below what is needed for our cars, despite Hoosier itself stating we can compensate that using higher pressures (40+ PSI COLD).

[Norm Peterson]

Hoosier is giving you good information that most people never find out about - you can use different Load Index tires as long as the mew pressure required to match the OE load @ pressure does not exceed the load table pressure limits for the new tire (XL = 42 psi, SL = 36 psi, unfortunately I haven't found the LL load vs inflation table yet). Obviously this does not necessarily correlate with the "max psi" labelling on the tire.

Whether you'd really want to run 40 psi cold is a whole 'nother matter.


Norm

[X25]

Originally Posted by Norm Peterson

Hoosier is giving you good information that most people never find out about - you can use different Load Index tires as long as the mew pressure required to match the OE load @ pressure does not exceed the load table pressure limits for the new tire (XL = 42 psi, SL = 36 psi, unfortunately I haven't found the LL load vs inflation table yet). Obviously this does not necessarily correlate with the "max psi" labelling on the tire.

Whether you'd really want to run 40 psi cold is a whole 'nother matter.


Norm

That's the heart of the issue. I think it's safe to say that these tires are not at their best at 40 PSI cold. I don't remember anyone using more than 28 PSI on any Hoosier in the Miata world.

Considering all this hassle, and the fact that Trofeo Rs can be acquired for cheap, at least until Z/28 sales (and their take-offs) dry out, I could not justify trying Hoosiers. Now I have a different issue: I do have 3 sets of Trofeo Rs and a set of MPSC 2 tires, and I should use them by next year, since some of those tires are from '14 Z/28s, and the rubber is getting old in my garage.

[L99CAMA2011]

Originally Posted by Norm Peterson

Hoosier is giving you good information that most people never find out about - you can use different Load Index tires as long as the mew pressure required to match the OE load @ pressure does not exceed the load table pressure limits for the new tire (XL = 42 psi, SL = 36 psi, unfortunately I haven't found the LL load vs inflation table yet). Obviously this does not necessarily correlate with the "max psi" labelling on the tire.

Whether you'd really want to run 40 psi cold is a whole 'nother matter.


Norm

Actually Norm, I ran lower load rated tires with higher tire pressure vs higher load rated with lower tire pressure . Car doesn't feel safe and secure at higher speeds. I did however pick up this Bridgestone offering of the RE-71r in 285-35-19 at 99 load index which in Bridgestone level is comparable to the 285-35-19 Pirelli P zero I have in 103 load rating more so because this is a more robust stiffer tire that honestly doesn't feel like any 99 index tire at all but much stronger. For example my past RE-11 285-35-19 99w sl provided more support for the front of my car than the Pirelli at 103xl. The threadwidth in real world measurements is actually equal to that of my past Bridgestone 305-30-19 RE-11 which was actually 10.5" not 11.1" like the specs stated. This tire weighs around 30 lbs.

[X25]

Originally Posted by L99CAMA2011

Actually Norm, I ran lower load rated tires with higher tire pressure vs higher load rated with lower tire pressure . Car doesn't feel safe and secure at higher speeds. I did however pick up this Bridgestone offering of the RE-71r in 285-35-19 at 99 load index which in Bridgestone level is comparable to the 285-35-19 Pirelli P zero I have in 103 load rating more so because this is a more robust stiffer tire that honestly doesn't feel like any 99 index tire at all but much stronger. For example my past RE-11 285-35-19 99w sl provided more support for the front of my car than the Pirelli at 103xl. The threadwidth in real world measurements is actually equal to that of my past Bridgestone 305-30-19 RE-11 which was actually 10.5" not 11.1" like the specs stated. This tire weighs around 30 lbs.

The sidewall stiffness is not the only measure of how much load a tire can withstand. If the Bridgestone tire with 99 load index can actually handle 103, and Bridgestone would then mark it as such; there is no gain in marking a tire with a lower load index than it can handle. The tire manufacturers usually have to drastically change the tire structure to increase the load rating, which is why sometimes 1 step up in tire size substantially increases the weight of the tire. It might involve running yet another steel belt, etc. In short, a 99 load-index tire is just good for its load rating, and stiffer sidewalls, a design decision made by the manufacturer with its own pros/cons, does not mean it's actually good for more.

Regarding the tire width, have you measured it on a 11" wheel or 10.5" wheel? Or, did you measure it off the wheel? The wheel width usually dictates the effective width of the tire, which is why the tire manufacturers also publish the wheel width used to measure the specs. In my experience, the only significant difference occurs when you compare a square cut tire to a round-cut one. The discrepancy you see might be due to measuring the width with a narrower wheel, or with no wheel at all.

Below is the picture of 305/30/19 RS-3 on 10.5" wheels vs. 305/30/19 Trofeo R on 11.5" wheels. When I measured the difference in width of these tires, it was almost 1", almost exactly equal to the difference in their fitted wheel widths.

[130R]

Originally Posted by X25

Regarding the tire width, have you measured it on a 11" wheel or 10.5" wheel? Or, did you measure it off the wheel? The wheel width usually dictates the effective width of the tire, which is why the tire manufacturers also publish the wheel width used to measure the specs. In my experience, the only significant difference occurs when you compare a square cut tire to a round-cut one. The discrepancy you see might be due to measuring the width with a narrower wheel, or with no wheel at all.

Just to be clear, the section width changes with wheel width; not the tread width. The rule-of-thumb is: for every 1/2" change in wheel width, the section width changes by 2/10".