Widest tire on 17x7? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

FRStock · 05-08-2014, 09:04 PM

Thinking about new wheels, some with a 50mm offest and others with a 42.

What's the widest tire I can fit on stock suspension? I'm thinking 235/40, even 245/40 if it fits. Probably Dunlop ZII's or Bridgestone RE-11s.

These will be for autox only.

finch1750 · 05-08-2014, 11:09 PM

People in CS have done 245s

renfield90 · 05-09-2014, 02:26 AM

Correct. IIRC the Hoosier 245 needs the +42 offset but the street tire 245s can live on stock offset. +50 might be pushing it though. Regardless, why not maximize your track width?

maxjedi · 05-09-2014, 07:15 AM

Tire manufacturers recommend 215 maximum for 7" wheel and 245 maximum for 8"

Kido1986 · 05-09-2014, 07:25 AM

An extremely stiff tire like the Z2 can do 235 or 245 on the 7". Something softer like an RS3 or any normal street tire (not competition level), I would stay with a 215.

Ive been running 235 Z2s, 215 RS3s and 215 daily tires for a while. I have effective offset of +47 and I can clear 245s on them (+50 with 3mm spacer). 245s will work on the Z2s, a few people are doing it but most are going 235s

TrqlessWonder · 05-09-2014, 08:34 AM

I have 245/40 hoosiers on mine. My wheels are +42, and sitting in grid I can just squeeze a finger tip between the tire and the spring. Even on A6s, I think once you pass 235, you start getting diminishing returns. That is, the 245 puts down a bigger contact patch than a 235 will, but not the full extra 10mm.

When I go to street tires next season, I'll probably be on some flavor of 235.

With the right equipment, I've seen 275s on a 6" rim.

FRStock · 05-09-2014, 08:59 AM

I know everyone runs RPF1s but what about Kosei K1 TS? The OZ wheels are just too expensive but the K1s are even cheaper and lighter than the RPF1s.

Kido1986 · 05-09-2014, 09:40 AM

Quote:

Originally Posted by FRStock

I know everyone runs RPF1s but what about Kosei K1 TS? The OZ wheels are just too expensive but the K1s are even cheaper and lighter than the RPF1s.

I run them, with a 3mm spacer.

G_Ride · 05-09-2014, 09:54 AM

I'm using a 245/40 RS3 Version 2 on RPF1s for CS. No problems so far.

chucky12012 · 05-09-2014, 09:57 AM

I run the Kosei's, but I am using 225 tires. For me it's a cleaner fit and I can run the rears at lower pressures and the stay responsive and don't roll over. I think the majority run 235 though, which should still fit on the Kosei's, but I'd guess it would be close. 245 on the Kosei would definitely require a spacer.

STV3 · 05-09-2014, 09:59 AM

225 is the widest I would go.

Biggins · 05-09-2014, 10:30 AM

I run 225 Yokohamas which are wider than most/all other manufacturers in that size on Koseis +50. They fit fine, but I run a 5mm spacer now for peace of mind. I'll probably run 245 or 235 next.

SeanRTR · 05-09-2014, 10:31 AM

Quote:

Originally Posted by maxjedi

Tire manufacturers recommend 215 maximum for 7" wheel and 245 maximum for 8"

You sound like the robotic dude who refused to mount my 245's on 17x7's at Discount tire.

"The tire could fall off the rim and cause a serious accident!"

245's fit just fine on a 17x7 in the rear, and I haven't died yet.
Pictures here:
http://www.ft86club.com/forums/showt...t=41955&page=2

tahdizzle · 05-09-2014, 11:11 AM

Domo arigato Mr. Roboto.

05-08-2014, 09:04 PM	#1
FRStock Member Join Date: Feb 2014 Drives: 13 FRS Location: Midwest Posts: 56 Thanks: 8 Thanked 31 Times in 8 Posts Mentioned: 0 Post(s)	Widest tire on 17x7? Thinking about new wheels, some with a 50mm offest and others with a 42. What's the widest tire I can fit on stock suspension? I'm thinking 235/40, even 245/40 if it fits. Probably Dunlop ZII's or Bridgestone RE-11s. These will be for autox only.

05-08-2014, 11:09 PM	#2
finch1750 Undisputed El Presidente Join Date: Jun 2012 Drives: Zenki 37J ZN6 Location: Stockton, CA Posts: 11,594 Thanks: 9,405 Thanked 9,411 Times in 5,270 Posts Mentioned: 374 Post(s)	People in CS have done 245s __________________ "Just like how a strut bar somehow enables you to corner 20MPH faster around a cloverleaf on-ramp, when the reality is, you can do it already but you just don't have to balls to do it." - CSG David

05-09-2014, 07:15 AM	#4
maxjedi The Cloudmaker Join Date: Jan 2013 Drives: GT86, G37S Location: Country of Bears Posts: 92 Thanks: 70 Thanked 47 Times in 34 Posts Mentioned: 2 Post(s)	Tire manufacturers recommend 215 maximum for 7" wheel and 245 maximum for 8" __________________ ... my build thread: maxjedi's turbo "daily drifter" GT86 ...

05-09-2014, 08:34 AM	#6
TrqlessWonder Senior Member Join Date: Feb 2014 Drives: 2014 FR-S Location: Upstate NY Posts: 287 Thanks: 127 Thanked 148 Times in 93 Posts Mentioned: 0 Post(s)	I have 245/40 hoosiers on mine. My wheels are +42, and sitting in grid I can just squeeze a finger tip between the tire and the spring. Even on A6s, I think once you pass 235, you start getting diminishing returns. That is, the 245 puts down a bigger contact patch than a 235 will, but not the full extra 10mm. When I go to street tires next season, I'll probably be on some flavor of 235. With the right equipment, I've seen 275s on a 6" rim. __________________ -Mike #24 CS/CSR

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05-09-2014, 02:26 AM	#3
renfield90 The Stig's German cousin Join Date: Mar 2013 Drives: 2013 FR-S Location: Tempe, AZ Posts: 1,071 Thanks: 140 Thanked 519 Times in 345 Posts Mentioned: 8 Post(s)	Correct. IIRC the Hoosier 245 needs the +42 offset but the street tire 245s can live on stock offset. +50 might be pushing it though. Regardless, why not maximize your track width?

05-09-2014, 08:59 AM	#7
FRStock Member Join Date: Feb 2014 Drives: 13 FRS Location: Midwest Posts: 56 Thanks: 8 Thanked 31 Times in 8 Posts Mentioned: 0 Post(s)	I know everyone runs RPF1s but what about Kosei K1 TS? The OZ wheels are just too expensive but the K1s are even cheaper and lighter than the RPF1s.

05-09-2014, 09:54 AM	#9
G_Ride Senior Member Join Date: Jun 2013 Drives: Some kind of Subaru Location: Campbell, CA Posts: 769 Thanks: 276 Thanked 257 Times in 185 Posts Mentioned: 16 Post(s)	I'm using a 245/40 RS3 Version 2 on RPF1s for CS. No problems so far.

05-09-2014, 09:57 AM	#10
chucky12012 Senior Member Join Date: Jul 2012 Drives: 2013 Asphalt Scion FR-S Location: Houston, TX Posts: 129 Thanks: 10 Thanked 41 Times in 27 Posts Mentioned: 0 Post(s)	I run the Kosei's, but I am using 225 tires. For me it's a cleaner fit and I can run the rears at lower pressures and the stay responsive and don't roll over. I think the majority run 235 though, which should still fit on the Kosei's, but I'd guess it would be close. 245 on the Kosei would definitely require a spacer.

05-09-2014, 09:59 AM	#11
STV3 Señor Member Join Date: May 2013 Drives: 2013 Scion FR-S Location: Rockland County NY Posts: 1,607 Thanks: 1,103 Thanked 1,322 Times in 645 Posts Mentioned: 17 Post(s)	225 is the widest I would go.

05-09-2014, 10:30 AM	#12
Biggins ... Join Date: Mar 2012 Drives: Yes Location: MD Posts: 391 Thanks: 34 Thanked 80 Times in 64 Posts Mentioned: 10 Post(s)	I run 225 Yokohamas which are wider than most/all other manufacturers in that size on Koseis +50. They fit fine, but I run a 5mm spacer now for peace of mind. I'll probably run 245 or 235 next.

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