wouldn't put them on my car if they were free ... they are just way to noisey

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there are several long wearing tires in the proper 17" size for your 420 ..... which is 235/45-17 in case you didn't know

some of them even have wear warranties

40K Mileage Warranty
BFG COMP TA HR4-2
BS TURANZA LS-Z

45K Mileage Warranty
BS POZ RE950


But, my personal choice would be the Firestone SZ50 EP because, I like the ride quality, tread life, and performance ..... I have several customers with MB's who are on the SZ50 and absolutely love them .....

you can check them and others out at

http://www.tirerack.com/a.jsp?a=AH3&url=/tires/index.jsp

__________________

Please, call me to place orders or for more info
use my name for on-line orders