speedometer accuracy w/ 19's
Thread Starter
Almost a Member!
Joined: May 2004
Posts: 63
Likes: 0
From: Orange, CA
C 32 ///AMG
speedometer accuracy w/ 19's
Any one get their C32 get the speedo tested after putting 19's and 35 or 30 profile tires on?
At 70, what would would the speedo read?
and at 50 what would it read?
Also I got H&R sport springs and was wondering with 4 people in the car, going over a speedbump would it scrape? What about turning the wheel w/ 19x8.5's on the front? If it does scrape can you take out the wheel well?
At 70, what would would the speedo read?
and at 50 what would it read?
Also I got H&R sport springs and was wondering with 4 people in the car, going over a speedbump would it scrape? What about turning the wheel w/ 19x8.5's on the front? If it does scrape can you take out the wheel well?
MBWorld Fanatic!
Joined: Nov 2001
Posts: 6,340
Likes: 22
From: Southern California, USA
2003 CL55 AMG
Take a look at this webpage for a tool to answer your questions.
http://toy4two.home.mindspring.com/tire.html
http://toy4two.home.mindspring.com/tire.html
Super Member
Joined: Dec 2003
Posts: 815
Likes: 2
That tire size has a diameter increase of almost two inches at approximately 26.58" vs. a stock rear at approximately 24.72". What front tire do you expect to run on the front that will closely match the rear tire's circumference?
In any case, your speedo will run slow by a significant margin and your performance will suffer not only because of the slower acceleration due to the larger tire circumference, but also because of the larger mass or gross weight of the tire itself, including the detremental increase in wheel weights.
275 30 19's are an inch smaller in diameter and a much better selection if you must go 19" and can somehow fit the 275's in the rear. Good luck fitting 245 35 19's on the front. If you don't care about any of this and only want the look, then you have to run 245 40 19's on the front as this is the only size that will match the 275 35 rear's circumference. Since you are running 19's, 255 are out of the question in the front since you will need to run a minimum of a 8.5" front wheel if not a 9.0" to be safe and distribute the loads properly. 18's are a much better bet in all performance respects. Good luck.
In any case, your speedo will run slow by a significant margin and your performance will suffer not only because of the slower acceleration due to the larger tire circumference, but also because of the larger mass or gross weight of the tire itself, including the detremental increase in wheel weights.
275 30 19's are an inch smaller in diameter and a much better selection if you must go 19" and can somehow fit the 275's in the rear. Good luck fitting 245 35 19's on the front. If you don't care about any of this and only want the look, then you have to run 245 40 19's on the front as this is the only size that will match the 275 35 rear's circumference. Since you are running 19's, 255 are out of the question in the front since you will need to run a minimum of a 8.5" front wheel if not a 9.0" to be safe and distribute the loads properly. 18's are a much better bet in all performance respects. Good luck.
