Tire compound vs Tire size - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Dihudaxia · 06-05-2015, 12:14 AM

For track day purpose, i have a set of Yokoham AD08r in 205/55/R16 size and a set of CSC5 in 225/45/R17 size.

I know the Yoko compound offers better grip vs the contis. But the contis have a larger footprint.

Which one will offer more outright grip for track use?

wparsons · 06-05-2015, 07:29 AM

Depends on alignment, weight of the car, etc. A stock weight FRS/BRZ is probably a bit heavy for the 205's though.

churchx · 06-05-2015, 11:15 AM

Hmm, even if 205 is stock width in markets with 16" for lesser trims?

Dihudaxia · 06-05-2015, 11:31 AM

205 is stock for certain Asia markets. Actually the car is so nimble on 205, grip is low which makes driving in certain conditions tricky.

Assuming all factors constant, weight, alignment, etc, am still trying to figure out which one provides more grip, not necessarily lap times

8R6 · 06-05-2015, 11:34 AM

aside from the rubber compound/stickiness, the ~10mm difference in sidewall might be something you want to take in consideration too for turn ins.

Dihudaxia · 06-22-2015, 10:55 AM

Well, strangely enough i have answered my own question with a run at the track.

1st Run: AD08R, 205/55/R16
2nd Run: CSC5, 225/45/R17

Conditions on the day was basically identical, the suspension setup, camber, caster, etc all identical on both runs. Only difference was the weight of the tire/rim combo and of course, the tire itself.

Long story short, compound wins!
AD08R, even though less wide, gave better grip in all corners, i could corner harder w/o breaking traction.

Now i won't talk about lap times cos i am not a pro-racer and they aren't always consistent across the board, i am still slowly improving, but having said that, i did better in the 2nd run with regards to cornering lines, confidence, braking points etc, but my 1st run lap times were still lower!

End of thread!

06-05-2015, 12:14 AM	#1
Dihudaxia Member Join Date: May 2014 Drives: 86 Location: Singapore Posts: 76 Thanks: 13 Thanked 38 Times in 19 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Tire compound vs Tire size For track day purpose, i have a set of Yokoham AD08r in 205/55/R16 size and a set of CSC5 in 225/45/R17 size. I know the Yoko compound offers better grip vs the contis. But the contis have a larger footprint. Which one will offer more outright grip for track use?

06-05-2015, 11:34 AM	#5
8R6 Senior Member Join Date: Jan 2014 Drives: FRS Location: SoCal Posts: 2,086 Thanks: 2,738 Thanked 1,338 Times in 746 Posts Mentioned: 30 Post(s) Tagged: 2 Thread(s)	aside from the rubber compound/stickiness, the ~10mm difference in sidewall might be something you want to take in consideration too for turn ins. __________________ Team BRG inspire-usa My car build #8R6

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06-05-2015, 11:15 AM	#3
churchx Senior Member Join Date: Mar 2015 Drives: 2014 GT86 Location: Latvia, Riga Posts: 4,333 Thanks: 696 Thanked 2,085 Times in 1,436 Posts Mentioned: 53 Post(s) Tagged: 1 Thread(s)	Hmm, even if 205 is stock width in markets with 16" for lesser trims?

06-05-2015, 11:31 AM	#4
Dihudaxia Member Join Date: May 2014 Drives: 86 Location: Singapore Posts: 76 Thanks: 13 Thanked 38 Times in 19 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	205 is stock for certain Asia markets. Actually the car is so nimble on 205, grip is low which makes driving in certain conditions tricky. Assuming all factors constant, weight, alignment, etc, am still trying to figure out which one provides more grip, not necessarily lap times

06-22-2015, 10:55 AM	#6
Dihudaxia Member Join Date: May 2014 Drives: 86 Location: Singapore Posts: 76 Thanks: 13 Thanked 38 Times in 19 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Well, strangely enough i have answered my own question with a run at the track. 1st Run: AD08R, 205/55/R16 2nd Run: CSC5, 225/45/R17 Conditions on the day was basically identical, the suspension setup, camber, caster, etc all identical on both runs. Only difference was the weight of the tire/rim combo and of course, the tire itself. Long story short, compound wins! AD08R, even though less wide, gave better grip in all corners, i could corner harder w/o breaking traction. Now i won't talk about lap times cos i am not a pro-racer and they aren't always consistent across the board, i am still slowly improving, but having said that, i did better in the 2nd run with regards to cornering lines, confidence, braking points etc, but my 1st run lap times were still lower! End of thread!

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