If I go to a larger size tire on my 84 300SD will it affect the speedo reading?

Mr. BILL

85 300D
84 300SD

Of course Bill, but by how much is a guess. The best way to find out is to record speedo and RPM readings at certain speeds with your current setup, change the tires and then do the same readings and calculate the differences. Or...you could get a friendly state trooper to saturate you with microwave or infrared energy before and after...

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Jeff Lawrence
1987 300e Sold
1989 300e
2000 Dodge Grand Caravan SE

[This message has been edited by jeffsr (edited 09-12-2000).]

It will probably be hard to figure out exactly how much your readings will change. If you are going to a larger tire your odometer and speedometer will show fewer miles and mph than you are actually doing. Best bet may be to measure the circumference of your current tires and the new tires. If the new tires are 105% the size of your current tires every 1000 miles on your odometer will be 1050 in reality and 60mph on your spedometer will be 63mph.




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Jason Priest
1986 420SEL

What 420 SEL said makes a lot of sense.

I believe the specifications for the 126 body is to have a tire that is 205/65/R15, but I go with 215/65/R15 for both of my cars.

Altough it is not recommended, it looks a heck of a lot better. The Benzs look mean as if were to tear up the road - the standard size looks more feminine (in my opinion). It handles a smigin more like a cruiser than a corvette, but who cares I don't drive em like a Corvette anyway.



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'89 420 SEL
'90 300 SEL
'68 Olds 88 Convertible
'84 300 SD (sold it)

Just wanted to add, not sure about the 65 part, it could be 60??

the 80-85 had a 14in tire at least mine did when i wnet to 15's i got a thinner tire and it is the right on the spedo

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Dan Younes
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1985 euro 500sel 223k
1986 420sel 86k soon 2 be
1981 300sd 285k sold
1979 240d 298k sold
1983 300sd 272k sold
1989 chrysler 2.2l Turbo
Leabaron 140k
1989 Dodge Carvan Se 295k
1994 S500
(hopefully someday)