SCCAForums.com

Fault Bucket:

Pics! Pics! We need pics!

Ask and ye shall receive....

275/35-15 Hoosier A6 next to 245/45-16 Hoosier A3S05 

 

 

Side view of 275/35-15 Hoosier A6 mounted on 10" wide wheel

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Steve Garnjobst
#75 XP
'99 Mazda Mutant

wow, those rock

__drool__

 

 

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'89 RX-7 GTU
Speed in Gears Calculator

I have them in my possession.  Compared to a 275/40R17 BFG g-Force TA they are about 3/4" narrower.  Measurement of the *total* tire width, unmounted, is about 260 mm.  They are virtually identical in width to my 255/40R17 Dunlop SP9000s (mounted on 17x9s).

 

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Garrick
'89 325is
DSP 72

E30 Racer:

I have them in my possession.  Compared to a 275/40R17 BFG g-Force TA they are about 3/4" narrower.  Measurement of the *total* tire width, unmounted, is about 260 mm.  They are virtually identical in width to my 255/40R17 Dunlop SP9000s (mounted on 17x9s).

Not sure I understand the importance of total tire width for a race tire. I could see wanting a bit more sidewall for impact protection & ride confort on the street or rough road race courses.  However, for autocross tires, I'd just as soon have a section width as narrow as possible, for a given tread width - all the better to stuff as much tire as possible under smaller cars.

It would be interesting to compare the measured tread width of the BFG & Hoosier.  Based on the manufacturer's own published numbers, the BFG's have a tread width of 9.5" and the Hoosiers have a tread width of 10.1".   The Hoosier numbers are definitely a bit conservative, but I have no idea how accurate BFG's numbers are.

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Steve Garnjobst
#75 XP
'99 Mazda Mutant

From the pics it looks like you could run 10.5 or 11" wheels and get a little more contact patch. Kinda like running the 225s on an 8.5 or 9. Dos it look that way in person?

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Randy Noll

rnoll98:

From the pics it looks like you could run 10.5 or 11" wheels and get a little more contact patch. Kinda like running the 225s on an 8.5 or 9. Dos it look that way in person?

Possibly, although the tires look just about perfect on a 10" wide wheel.  If cost were no object, I'd probably test with some 10.5" wheels, just to see if the difference was measureable.

For me,10" is the perfect width, as it's also the recommended width for the radial slicks I'll run if the 275's don't meet expectations.

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Steve Garnjobst
#75 XP
'99 Mazda Mutant

Fault Bucket:

Pics! Pics! We need

pics!

Compared to a Kumho v710 215/50R13   13" mounted 15" not (waiting on wheels)

 

 

 

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Chris
51 SM2

My 15" x 10" Bogart wheels just showed up. The digital scales says they weigh 14.2 lbs each.

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Steve Garnjobst
#75 XP
'99 Mazda Mutant

so any news on how your tires are doing on the bogarts?

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1990 SM2 turbo miata

My car will be making it's '07 debut May 26-27 in Milwaukee. 

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Steve Garnjobst
#75 XP
'99 Mazda Mutant

285/30/18 KUMHO V710 on 18x9.5" rim (i have another set on 18x10s, they are identical)

versus

275/35/18 HOOSIER A6 UNMOUTED (thanks Pat)

I swear the 275s are wider!

Theoritical contact patch should go down about 13% compared to the 285 on the 18" wheel. but thats just that - theory. 

 

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Vinax
1994 BMW 325i FP AutoX car.
http://www.myfastbmw.com

I would think that between those two, the one that gives the best gearing would be the fastest.  OTOH I am a noob so take my comments with a grain of salt.

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1990 SM2 turbo miata

i ran the 275's on my SM civic this past weekend... holy sh!t they wear fast! car needs a big setup change, but they have a lot of potential

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Hi! I'm Rodney. "Hi Rodney!" I'm addicted to Solo....

Rodney:

i ran the 275's on my SM civic this past weekend... holy sh!t they wear fast! car needs a big setup change, but they have a lot of potential .

I have two events next weekend.  My wheels are scheduled to arrive today.  I am curious about your wear observations.  So they need more or less camber?  What wear indicators are you seeing? 

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Chris
51 SM2

Rodney:

i ran the 275's on my SM civic this past weekend... holy sh!t they wear fast! car needs a big setup change, but they have a lot of potential

 

They wear fast, but at least they are expensive...

ChrisSwearingen:

Rodney:

i ran the 275's on my SM civic this past weekend... holy sh!t they wear fast! car needs a big setup change, but they have a lot of potential .

I have two events next weekend.  My wheels are scheduled to arrive today.  I am curious about your wear observations.  So they need more or less camber?  What wear indicators are you seeing? 

 i put 17 runs on a abrasive asphalt lot and i am well past the wear indicators. i am guessing 40 runs will be around max for the tire on my car (fwd civic). i will answer your camber question wednesday, as i will be re-aligning wed night. till then enjoy pics of "275 man"...

 

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Hi! I'm Rodney. "Hi Rodney!" I'm addicted to Solo....

If ever there were a caption contest in the making that picture has to be it.   Thanks for the update.  I was budgeting 50 runs on the tires.  I know my Miata will consume them at a different rate than your civic, hopefully its a slower rate.

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Chris
51 SM2

Rodney:

 i put 17 runs on a abrasive asphalt lot and i am well past the wear indicators. i am guessing 40 runs will be around max for the tire on my car (fwd civic).

Please put me on the list for getting a pair of worn out ones for fitment...

ChrisSwearingen:

If ever there were a caption contest in the making that picture has to be it.   Thanks for the update.  I was budgeting 50 runs on the tires.  I know my Miata will consume them at a different rate than your civic, hopefully its a slower rate.

 

i would imagine your fronts would wear less compared to your rears. how much hp? my fronts do get a lot of a abuse, even 710's wore quickly 

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Hi! I'm Rodney. "Hi Rodney!" I'm addicted to Solo....

The rears do wear a little faster but not considerably.  I guess that means I need more HP.  I manage to heat cycle out 710s just a little before I wear the grooves completely off.

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Chris
51 SM2