slicks to road tire size conversion help
10-10-2014, 10:06 AM
#1
Racer
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slicks to road tire size conversion help
This is for another car but since there is more traffic thought I post here. What would be the road tire size equivalent of these sizes?
27/65-18 S7A
31/71-18 S9C
Thanks a bunch
27/65-18 S7A
31/71-18 S9C
Thanks a bunch
10-10-2014, 10:49 AM
#2
Nordschleife Master
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Posted an answer for you over in the Cup forum.
Actually, thirty seconds of Google would have helped you. Like Tire Rack for road tires, each and every vendor of race tires also has charts of slick dimensions.
Really very easy if you think about it.
Actually, thirty seconds of Google would have helped you. Like Tire Rack for road tires, each and every vendor of race tires also has charts of slick dimensions.
Really very easy if you think about it.
10-10-2014, 11:02 AM
#3
Three Wheelin'
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Not sure if this one will help, it is the one I have used in the past.
www.cargister.com/calculator-race-tires
www.cargister.com/calculator-race-tires
10-10-2014, 01:41 PM
#4
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Front: 270mm is the width, 65cm is the overall height, for 18" wheels, the last three digits is usually what the manufacturer uses as internal code for compound. The closest street tire size would be 275/35-18 which mathematically work out to be 64.9cm.
Rear: 310mm is the width, 71cm is the overall height, for 18" wheels, the last three digits is usually what the manufacturer uses as internal code for compound. The closest street tire size would be 315/40-18 which mathematically work out to be 70.9cm.
Please keep in mind the calculated numbers don't always match the actual. But they are close enough for most applications.
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PCA National Instructor
TPC Racing stats:
2023 Porsche Sprint Challenge 992 Cup Am Champion
2023 Porsche Sprint Challenge GT4 Pro-Am Team Champion
2022 Porsche Sprint Challenge 992 Cup & 991 Cup Champion
2020 IMSA GT3 Cup Challenge 2nd Championship
2018 IMSA GT3 Cup Challenge 2nd Championship
2016 IMSA GT3 Cup Challenge Champion
2013 IMSA GT3 Cup Challenge Champion
2006 Rolex-24 @ Daytona GT Champion
2004 Grand-Am SGS Class Champion
Last edited by Tom@TPC Racing; 10-10-2014 at 03:13 PM. Reason: added the close enough comment
10-10-2014, 02:07 PM
#5
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In slick size the middle number is not the percentage of the width like it is on a street tire. The middle number is the overall height, which I think is a better and simpler way to label the tire size.
10-10-2014, 03:10 PM
#6
How do scrub slicks comp to R6s in terms of grip and HC life?
07-13-2022, 04:02 AM
#7
Is this for the Manthey Racing wheels on CGT?
Did you end up fitting the wheels with road tires?
Thanks