Indeed, the w123 is spec'ed for HR rated tires.

Well, for $51 you can always sell them for that much at a garage sale in the event you are not satisfied.

__________________
1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
********************
1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD