loudes13

Has anyone tried 205 Hoosier SM7's on 15x8's or more specifically 15x9's? When I search for this I get for sale posts, not helpful threads.

I know wider tires will benefit from the wider 9's, but will 205's benefit significantly too?

Savington

iTrader: (31)

205/50 SM6s run extremely wide. Basically a 205 in name only. Needs a 9" wheel to optimize the tire. I suspect the SM7 is no different.

loudes13

Sounds like good news, but Hoosier's are known to squeeze onto smaller rim widths without penalty. That's why I wonder. SM7's are cheaper, but usually wider Hoosiers are always better.

Anyone have some input after trying them?

emilio700

iTrader: (3)

The SM6 and SM7 are the same size so yes, run them on 9's. No need to research any further.

loudes13

That's the route I'm most likely taking, but you don't need 8 or 9 inches of rim width for Hoosiers. Look at my ITB CRX for an example. I ran 225/45/13's on 13x6's, and yes I did try all 3 13" sizes to find the fastest setup.

greddygalant

iTrader: (3)

I run them on x8s but they are HUGE, a x9 would fit the, much better

Schuyler

iTrader: (1)

I *cough* um. Run them on *cough*6s*cough*

I r teh suck.

jpreston

iTrader: (4)

I found my SM7s to be fastest on 14x5.5 ronal teddybears. I think the teddybears just upped my testosterone levels that far. I'm trying 13x4s next time. Smaller is better. Fvck the haters.

circuitmstr74

iTrader: (1)

205 R7's are over a second faster than sm7's. I have first hand experience of that

emilio700

iTrader: (3)

Data analysis fail


You tried the three different tires (185/60, 205/60 and 225/45) on the same 13x6, went fastest on the 225/45 and concluded that the 225/45 is fastest on a 6".

I can guarantee you that the 205/60 on a 8 would have been faster. The 185/60 on a 7 might have even been faster because of the gearing and roll center improvements.

205/50/15 Hoosiers are fastest on 9's by quite a margin over 8's. Proven over and over in A/B tests by racers all over. Wheel should be at least as wide as actual tread, which in this case is about 215mm (8.46")

Savington

iTrader: (31)

Need, no. Want, yes. Putting the 205/50 SM6/SM7 on a 6 or 7" wheel when 9s are available and allowed for your race class is leaving time on the table, 0.5-0.75 seconds.

turbofan

iTrader: (1)

guy asks a question.

Guy gets an answer.

guy says answer is wrong.



Why is guy asking a question?

FatKao

Ugh. I liked getting cheap tires.

Ryephile

iTrader: (1)

ftfy

Squeeze, yes. Penalty of slowness, also yes. Your old CRX experiment used tire width as the variable, so you have no data on wheel width.

A few years ago I did an A/B with 205 R6's on 6.5" and 7" wheel widths and I can say that the wider wheel was better in all regards.

At the very least listen to Emilio and Andrew; they've been doing this for a bit.


Sploosh. Can't wait to run R7's in the spring.