[pbsinternet1le]

Originally Posted by cab33

Everyone in A-street run 305s on a 10 inch wheel up front.
Doesn't get more aggressive than autocross on sticky concrete.

I suggest you youtube some of provoste driving before commenting about driving skills or aggressive driving..no doubt one of the best...

[cab33]

I wasn't saying anything about his driving, don't know him.
The question was, will 305s work on a 10 inch wheel... and I've been using that set up for 3 years(autocross and track).

Not trying to win the internet, just giving my opinion on the asked question.

[pbsinternet1le]

I was suggesting you might want to listen to his advice..

[TrackClub]

I would never run 305 on a 10 rim for track duty either. Especially on the front of a heavy car. Sometimes folks go outside of spec and get away with it but imo there is no good reason for it as the sidewall geometry (and flexing) will be beyond design spec - albeit a tire with very stiff sidewall may mask it. NB All pro teams go the other way around and run max width rim for a given tire.
I know guys who run R7s on the street (illegally). This fact doesnt mean it is automatically ok only cause somebody does it and hasnt been caught on a freeway by a sudden deluge yet. Etc.

[diirk]

You can run a 305 on a 10.
I'd say run it and keep an eye on the wear of the tire. Also watch pressures and temps.
Especially if its a good deal on the tires and will give you more opportunity to hit the track. Plus, if you've been running the stock tires sizes on the track, this will give you a few data points for comparison.

[pbsinternet1le]

Originally Posted by diirk

You can run a 305 on a 10.
I'd say run it and keep an eye on the wear of the tire. Also watch pressures and temps.
Especially if its a good deal on the tires and will give you more opportunity to hit the track. Plus, if you've been running the stock tires sizes on the track, this will give you a few data points for comparison.

I'd say you try it first...

[diirk]

Originally Posted by pbsinternet1le

I'd say you try it first...

I wouldn't have a problem with that. I run 205 on 9's on my Miata. A 305 on a 10 isn't much of a stretch....

[Provoste]

Originally Posted by diirk

I wouldn't have a problem with that. I run 205 on 9's on my Miata. A 305 on a 10 isn't much of a stretch....

Huh?!? You realize those are exactly the opposite right?

A 205 on a 9" wheel could be considered "stretched" unless you're talking about a 205/50 15" Hoosier (as wide as a 245 street tire), which is just well supported on a 9".

A 305 on a 10" wheel is completely over squared, the opposite of stretched, it is not well supported.

So to compare a tire in both the sizes you mention:

205/50 15" Hoosier R7: Section Width: 8.5 inch- section width is .5 narrower than the wheel.

305/30 20" Hoosier R7: Section Width 12.2 inch- section width 2.2 inches wider than the wheel.

[diirk]

Originally Posted by Provoste

Huh?!? You realize those are exactly the opposite right?

A 205 on a 9" wheel could be considered "stretched" unless you're talking about a 205/50 15" Hoosier (as wide as a 245 street tire), which is just well supported on a 9".

A 305 on a 10" wheel is completely over squared, the opposite of stretched, it is not well supported.

So to compare a tire in both the sizes you mention:

205/50 15" Hoosier R7: Section Width: 8.5 inch- section width is .5 narrower than the wheel.

305/30 20" Hoosier R7: Section Width 12.2 inch- section width 2.2 inches wider than the wheel.

Yes I realized that. I was just sharing an example of a configuration that is not normally considered acceptable. In the case of my car, it has proven to be the one of the fastest.

[Provoste]

Originally Posted by diirk

Yes I realized that. I was just sharing an example of a configuration that is not normally considered acceptable. In the case of my car, it has proven to be the one of the fastest.

Your miata example is completely acceptable, that’s what racers at high levels run, a tire with a section width of the tire, or slightly wider.

You will NEVER find anyone in legitimate race competition running a tire 2-2.5 inches wider section width that the wheel.

I’m glad your setup as proven to be “one of the fastest”, guessing you’re taking autocross.

[TrackClub]

Originally Posted by Provoste

Huh?!? You realize those are exactly the opposite right?

A 205 on a 9" wheel could be considered "stretched" unless you're talking about a 205/50 15" Hoosier (as wide as a 245 street tire), which is just well supported on a 9".

A 305 on a 10" wheel is completely over squared, the opposite of stretched, it is not well supported.

So to compare a tire in both the sizes you mention:

205/50 15" Hoosier R7: Section Width: 8.5 inch- section width is .5 narrower than the wheel.

305/30 20" Hoosier R7: Section Width 12.2 inch- section width 2.2 inches wider than the wheel.

This was exactly my point as well, in terms of maximizing rim size vs tire. No pro race team would ever run the latter. And for good reasons.

[AZ_1LE]

Technically? Yes. Would I, ever? Nope. Get some dedicated 11" track wheels if that's what tire you think you need to run.

[diirk]

Originally Posted by Provoste

Your miata example is completely acceptable, that’s what racers at high levels run, a tire with a section width of the tire, or slightly wider.

You will NEVER find anyone in legitimate race competition running a tire 2-2.5 inches wider section width that the wheel.

I’m glad your setup as proven to be “one of the fastest”, guessing you’re taking autocross.

Actually road course. Autocross guys prefer a different setup.
Big HP guys go much wider.

[FNxR3DNECK]

I run 305 square on my 19x10 & 19x11s but they are strictly for Autocross, as well as the RE71Rs run kinda skinny, as in 305 RE71Rs aren't much wider than the stock 285 GYs so there really isn't much noticeable stretch. With that said like some of the others I wouldn't really recommend it for track duty, but it is perfectly fine for Autocross.