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Discussion Starter #1
Has anyone run 225/45/15 front and 245/40/15 rear on the Spyder in ES ?

Also, what rims do people with 03+ Spyder use in ES ? It looks like there are quite a few choices in a 15x7 rear, but what about a 15x6 for the front ? Any matched sets that work ?
 

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I am interested in this as well. Although, those tire widths seem crazy. If a 225 can be forced onto a 6" wheel that seems like it would perform poorly.
 

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Discussion Starter #3
Some of the 93-5 MR2 autocrossers in stock class used to put 225/45/15 Hoosiers on the stock front 15x6 and 275/35/15 on the 15x7 rear. Hoosier A6's are wider than street tires. Now THAT was a squeeze. I quit auto crossing my 93 before those 275s were released. I just ran the 205/225 setup on the stock sized rims. They were probably as wide as 225/245 street tires.
 

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Some of the 93-5 MR2 autocrossers in stock class used to put 225/45/15 Hoosiers on the stock front 15x6 and 275/35/15 on the 15x7 rear. Hoosier A6's are wider than street tires. Now THAT was a squeeze. I quit auto crossing my 93 before those 275s were released. I just ran the 205/225 setup on the stock sized rims. They were probably as wide as 225/245 street tires.
Are the dedicated comp tires made to work better when squeezed onto narrower rims than street tires? I ask because I am l looking at BFG Rivals and the smallest size is a 205, so I am wondering if those aggressive types of street tires will play nice on the stock 15x6 fronts.
 

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Discussion Starter #5
The Hoosier and other R compounds have stiffer sidewalls, so they would probably be better if squeezed onto a more narrow rim than the recommended range. So that is the question, would a 225/45/15 street tire have more grip on a 15x6 than a 205/50/15 ? And same for the 245/40/15 on a 15x7 - better than the 225/45/15 ? I would think the wider the tire gets on a particular rim beyond the recommended range, the more diminishing return it would have. But would it ultimately be better ? That is the question. I was hoping someone would chime in and say - yea, I used the 205/225 setup and switched to the 225/245 setup. Maybe someone will need to run the same car one way and then try the other setup to compare.
 

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The Hoosier and other R compounds have stiffer sidewalls, so they would probably be better if squeezed onto a more narrow rim than the recommended range. So that is the question, would a 225/45/15 street tire have more grip on a 15x6 than a 205/50/15 ? And same for the 245/40/15 on a 15x7 - better than the 225/45/15 ? I would think the wider the tire gets on a particular rim beyond the recommended range, the more diminishing return it would have. But would it ultimately be better ? That is the question. I was hoping someone would chime in and say - yea, I used the 205/225 setup and switched to the 225/245 setup. Maybe someone will need to run the same car one way and then try the other setup to compare.
I'm wondering if 225 street tires will even stay on the rim. I think they would feel "squishy", or unresponsive. I put 245 R-S4's on a 7.5" rim and they were looking like they wanted to eat the rim, though they felt okay.
 

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Read the E Street thread. Or go to E Street chat on facebook, nobody really comes here anymore.

We routinely put 225's square on the car, and back 5 years ago we tested a bunch of different sizes. The 245 was not worth the rotational mass, and it did not heat up fast enough to be used in a national setting.

The 205 A052 up front is probably the way to go these days, they're about equal in size to a 225 BFG from back then. And the 225/50 A052 rear is probably a good choice because you get better gearing, that is very helpful vs the Miata. You can also try the CR-1.
 

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Discussion Starter #8
Interesting. To go with a 205/50/15 front I would think you would want a 225/45/15 rear, instead of a 225/50/15 rear. The 225/50/15 is taller than the stock tire. I would think you want a tire equal or shorter than stock in the rear for better gearing. Or do you run out of 2nd gear with the shorter tire and want the taller for that reason ?
 

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A052 does not come in any other size than 205/50 & 225/50 so you don't really have a choice. It works out for the MRS in national competition because of the gearing in second. You want more second gear because national sites are typically in-between 2nd & 3rd, riding the limiter on a 225/45 is 55-56mph when the Miata is 58mph. Shifting puts you in an awkward position most of the time.

225/45 acceleration gearing benefits could be worth it for certain slower courses. Requires testing on the per-application use. But again, some tires only come in certain sizes so depending on your choice you will be stuck with it.
 

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Discussion Starter #10
Good info on tires. Thanks guys.

What about rims ? What do the 2003+ guys use when running 15s in the rear ? Is there a matched set of 15x6 and 15x7 anywhere ? Or do they run stock front and just any 15x7 rear within offset range ?
 
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