The 2015 version of the autocross index you love to hate is now out. The PAX/RTP index is used to compare SCCA event results across classes. This year all street tire and stock classes now require a minimum tread wear rating of 200 on all tires. Also gone are the race tire ‘stock’ classes.
Stock Classes
SS
0.835
AS
0.829
BS
0.826
CS
0.814
DS
0.812
ES
0.808
FS
0.810
GS
0.806
HS
0.796
Street Touring
STF
0.801
STS
0.828
STX
0.831
STR
0.838
STU
0.844
Street Prepared
SSP
0.871
ASP
0.865
BSP
0.863
CSP
0.861
DSP
0.854
ESP
0.849
FSP
0.840
Race Tire
SSR
0.859
Classic American Muscle
CAM-C
0.816
CAM-T
0.825
CAM-S
0.836
Karts
KM
0.955
JA
0.878
JB
0.842
JC
0.734
Prepared
XP
0.905
BP
0.881
CP
0.864
DP
0.879
EP
0.874
FP
0.880
Street Modified
SMF
0.853
SM
0.870
SSM
0.882
Modified
AM
1.000
BM
0.964
CM
0.919
DM
0.918
EM
0.922
FM
0.926
FSAE
0.984
For historical indexes and more information Rick Ruth’s PAX/RTP
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Autocross, featured, PAX Index, SCCA
