20" wheels mess w/ your odometer???
Thread Starter
Banned
Joined: Nov 2010
Posts: 13
Likes: 0
From: RI
2009 C300
20" wheels mess w/ your odometer???
hey guys... New to the forum and looking for help. There has to be somone else who has had this happen to them... I just recently put 20" wheels on my 09 c300 and noticed my odometer is reading faster than it should. Navi said the trip is 38miles car clocked in 48 miles!!! Somone help, is there a way to calibrate the car for the larger wheel???
MBWorld Fanatic!
Joined: Sep 2009
Posts: 2,108
Likes: 7
From: Dix Hills, New York
2012 C250 Coupe
Generally, the odometer is changed by how many turns the powertrain makes. This is related to the rim size. If you get larger rims, the rim or powertrain will turn less to get the same distance traveled... What you are reporting is the exact opposite. Theoretically your speedometer should be reporting slower speed and lower miles from the odometer after you changed out for bigger rims. But if your car is doing the opposite, then you have me confused... The only answer for sure is to contact your mercedes dealer. You can change the way the odometer calculates the distances, but only through star diagnostics (capable only at a authorized MB dealer).
Bottom line, contact your dealer immediately to avoid excessive mileage.
Bottom line, contact your dealer immediately to avoid excessive mileage.
MBWorld Fanatic!
Joined: Sep 2007
Posts: 1,481
Likes: 2
From: Southeast
2008 C300 Sport, RWD, US
Distance traveled is based in part to the tire's outside diameter.
When you upsized the rims, you were suppose to use tires that maintain the same outside diameter than the original tires. Sounds like you went with tires that had a smaller outside diameter. Takes more revolutions to travel the same distance....which has got to be killing your fuel economy and ride hard on rough roads.
When you upsized the rims, you were suppose to use tires that maintain the same outside diameter than the original tires. Sounds like you went with tires that had a smaller outside diameter. Takes more revolutions to travel the same distance....which has got to be killing your fuel economy and ride hard on rough roads.
MBWorld Fanatic!
Joined: Feb 2004
Posts: 3,986
Likes: 6
From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
BIG wheels and the consequences
Distance traveled is based in part to the tire's outside diameter.
When you upsized the rims, you were suppose to use tires that maintain the same outside diameter than the original tires. Sounds like you went with tires that had a smaller outside diameter. Takes more revolutions to travel the same distance....which has got to be killing your fuel economy and ride hard on rough roads.
When you upsized the rims, you were suppose to use tires that maintain the same outside diameter than the original tires. Sounds like you went with tires that had a smaller outside diameter. Takes more revolutions to travel the same distance....which has got to be killing your fuel economy and ride hard on rough roads.
Administrator
Joined: Sep 2002
Posts: 15,769
Likes: 37
From: www.Traben-Trarbach.de
MPG+ ROLFCOPTER
hey guys... New to the forum and looking for help. There has to be somone else who has had this happen to them... I just recently put 20" wheels on my 09 c300 and noticed my odometer is reading faster than it should. Navi said the trip is 38miles car clocked in 48 miles!!! Somone help, is there a way to calibrate the car for the larger wheel???
Std tire on yours is 225/45-17. 225/35-20 is larger so your post about the odometer doesn't make sense.
MBWorld Fanatic!
Joined: Feb 2004
Posts: 3,986
Likes: 6
From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
Revs per mile
Which means your tire/wheel combination is 4.5% smaller overall than the stock tires were. So, you register 4.5% more miles than you actually travel. Which also means your warranty will expire that much sooner at 47750 miles actual if the larger wheels were installed at mile zero.
Your fuel consumption is also higher.
Last edited by RLE; Nov 16, 2010 at 11:27 PM.
Trending Topics
MBworld Guru
Joined: Apr 2002
Posts: 22,058
Likes: 18
From: Diamond Bar, CA
W206 PHEV AMG
Since the 17" and 18" stock sizes have the same diameter or near enough, I calculate for 225/45-17, the revs per mile would be 807. Your twenties with 225/35-20 revs per mile are 770.
Which means your tire/wheel combination is 4.5% smaller overall than the stock tires were. So, you register 4.5% more miles than you actually travel. Which also means your warranty will expire that much sooner at 47750 miles actual if the larger wheels were installed at mile zero.
Your fuel consumption is also higher.
Which means your tire/wheel combination is 4.5% smaller overall than the stock tires were. So, you register 4.5% more miles than you actually travel. Which also means your warranty will expire that much sooner at 47750 miles actual if the larger wheels were installed at mile zero.
Your fuel consumption is also higher.
225/35/20 rev per mile is 793.8 with overall diameter of 26.20 inches
(number courtesy of tiresize calculator)
his tire is larger, not smaller. (according to what he posted anyway)
MB World Stories
The Best of Mercedes & AMG
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)
Verdad Gallardo
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
Thread Starter
Banned
Joined: Nov 2010
Posts: 13
Likes: 0
From: RI
2009 C300
Its got me confused also! im not too worried about the warranty as of right now because the rims are only on for a few months as I live in New England.
I'm def not an expert on tires, but I know for a fact that is the size of the tires.
Can mercedes reconfigure this to corret the issue? or should I just ignroe it and live with the 4.5% increase in mileage. the gas isnt an issuse either as this car is more or a weekend/night car I rearly drive it.
If i bring this to the dealer like this will it void my warranty??
oh and just so you know the car is a lease figured it was the best option for me as like I said I dont drive it much.
I'm def not an expert on tires, but I know for a fact that is the size of the tires.
Can mercedes reconfigure this to corret the issue? or should I just ignroe it and live with the 4.5% increase in mileage. the gas isnt an issuse either as this car is more or a weekend/night car I rearly drive it.
If i bring this to the dealer like this will it void my warranty??
oh and just so you know the car is a lease figured it was the best option for me as like I said I dont drive it much.
Member
Joined: Oct 2008
Posts: 232
Likes: 10
From: Ontario, Canada
2016 C450 AMG, 2012 C350 4Matic Sport
It's right in the Owner's manual
MBWorld Fanatic!
Joined: Feb 2004
Posts: 3,986
Likes: 6
From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
Revs per mile etc.
http://www.miata.net/garage/tirecalc.html
My revs per mile were correct but I got the effect backwards:
"Which means your tire/wheel combination is 4.5% smaller overall than the stock tires were. So, you register 4.5% more miles than you actually travel. Which also means your warranty will expire that much sooner at 47750 miles actual if the larger wheels were installed at mile zero."
Forget that because it's wrong.
What is correct is that the larger wheel/tire combination will make the car slower to accelerate PLUS throw off the odo and speedo readings.
MBworld Guru
Joined: Apr 2002
Posts: 22,058
Likes: 18
From: Diamond Bar, CA
W206 PHEV AMG
You were OK until you quoted revs per mile and then it all went to hell. Go here and recalculate:
http://www.miata.net/garage/tirecalc.html
My revs per mile were correct but I got the effect backwards:
"Which means your tire/wheel combination is 4.5% smaller overall than the stock tires were. So, you register 4.5% more miles than you actually travel. Which also means your warranty will expire that much sooner at 47750 miles actual if the larger wheels were installed at mile zero."
Forget that because it's wrong.
What is correct is that the larger wheel/tire combination will make the car slower to accelerate PLUS throw off the odo and speedo readings.
http://www.miata.net/garage/tirecalc.html
My revs per mile were correct but I got the effect backwards:
"Which means your tire/wheel combination is 4.5% smaller overall than the stock tires were. So, you register 4.5% more miles than you actually travel. Which also means your warranty will expire that much sooner at 47750 miles actual if the larger wheels were installed at mile zero."
Forget that because it's wrong.
What is correct is that the larger wheel/tire combination will make the car slower to accelerate PLUS throw off the odo and speedo readings.
http://www.1010tires.com/TireSizeCal...?action=submit
Last edited by FrankW; Nov 17, 2010 at 09:11 PM.
MBWorld Fanatic!
Joined: Feb 2004
Posts: 3,986
Likes: 6
From: SEATTLE WASHINGTON USA
'08 C300 Lux Barolo Red Beige Leather P2 MM 18" wheels '84 944
RPM
Why don't you do the final calculation yourself. 5280X12 (inches in a mile) and divide by the circumference. There it is.
Maybe all the car owners here with 20" wheels should see how far off their speedos may be.
MBworld Guru
Joined: Apr 2002
Posts: 22,058
Likes: 18
From: Diamond Bar, CA
W206 PHEV AMG
however 1010 tire size calculator as well as tirerack showed 225/45/17 tire rev per mile at 830-831.
I think the lower number calculate for the squish factor and one does not.
Last edited by FrankW; Nov 18, 2010 at 12:02 AM.
Junior Member
Joined: Sep 2010
Posts: 41
Likes: 0
C350 CDI Sport
hey guys... New to the forum and looking for help. There has to be somone else who has had this happen to them... I just recently put 20" wheels on my 09 c300 and noticed my odometer is reading faster than it should. Navi said the trip is 38miles car clocked in 48 miles!!! Somone help, is there a way to calibrate the car for the larger wheel???
http://www.ukzero.co.uk/calculator1.htm
