Is it the table on the piece of paper that comes with Sorex tires? If so this is what it says on the table;
(The Hi ...(to) Low refers to the grip on the track.)
.....20R....24R.....28R...l...32R....36R....40R
H...... HPI orange........l.....HPI green
i .....Yokomo 037F.......l.....HPI orange
.. ....Sorex typeA-M.....l....Yokomo 037F
.. ....Sorex typeB-M.....l...Sorex typeA-M
L ......HPI yellow..........l...Sorex typeB-M
o ....Yokomo 037M......l....HPI yellow
w ....Yokomo 037S......l.....Yokomo 037M
(is this the chart u r talking about?)
This is just a insert suggestion fr Sorex for their tires, wat works on the track u r running in might defer. just my 2 cents