New Shoes fitted
#1
Junior Member
Thread Starter
New Shoes fitted
Upgraded tyres this week. A huge difference!
Michelin P4s 245-35/19 front, 285-35/19 rear. More comfort and much more grip. Far better than OEM width which is too narrow.
Michelin P4s 245-35/19 front, 285-35/19 rear. More comfort and much more grip. Far better than OEM width which is too narrow.
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right_mr (04-30-2018)
#5
Former Vendor of MBWorld
great tire.. saw them as stock on the new GLC63's we have
#6
Junior Member
#7
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Join Date: Nov 2017
Location: SURREY, UK
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2018 C63s Estate, 2017 gla 45 [Sold] 2017 smart 44 brabus sport [for the Mrs]
And these bad boys fit perfectly on the standard spec C63s rims without any issues/tinkering? great effort. I'll look to stick these bad boys on my car in a few k miles once i've destroyed my pilot sports.
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#9
MBWorld Fanatic!
going from a 265/35/19 to a 285/35/19 at 80 mph the speedo would read 81.68 mph or where you might be driving more of the time 100 is 102.1
https://tiresize.com/speedometer-calibration/
https://tiresize.com/speedometer-calibration/
Last edited by RDOCA; 04-30-2018 at 02:04 PM.
#10
going from a 265/35/19 to a 285/35/19 at 80 mph the speedo would read 81.68 mph or where you might be driving more of the time 100 is 102.1
https://tiresize.com/speedometer-calibration/
https://tiresize.com/speedometer-calibration/
#11
Super Member
I would read it this way: when the speedo shows 30 mph with the new rubber, you're actually doing 29.38 mph. Likewise from the other post (80 mph the speedo would read 81.68 mph),
I extrapolate that when your speedo reads 80 mph, you'll actually be doing 78 to 79.something mph. In both cases, your speedo is getting to the figures on the speedo long before the
car is actually doing those speeds.
I extrapolate that when your speedo reads 80 mph, you'll actually be doing 78 to 79.something mph. In both cases, your speedo is getting to the figures on the speedo long before the
car is actually doing those speeds.
#12
This is correct. The new larger width tire has a larger diameter, which takes longer to rotate once, hence showing a slower speed on the speedometer than the vehicle is actually traveling. Several of the above posts are incorrect and they have it backwards.
Last edited by ezatnova; 05-28-2018 at 08:59 AM.
#13
MBWorld Fanatic!
You want to know if you are speeding and by how much./
Use this one as it is easier to understand.
https://tiresize.com/speedometer-calibration/
#14
MBWorld Fanatic!
I would read it this way: when the speedo shows 30 mph with the new rubber, you're actually doing 29.38 mph. Likewise from the other post (80 mph the speedo would read 81.68 mph),
I extrapolate that when your speedo reads 80 mph, you'll actually be doing 78 to 79.something mph. In both cases, your speedo is getting to the figures on the speedo long before the
car is actually doing those speeds.
I extrapolate that when your speedo reads 80 mph, you'll actually be doing 78 to 79.something mph. In both cases, your speedo is getting to the figures on the speedo long before the
car is actually doing those speeds.
#15
MBWorld Fanatic!
You guys are calculating based on assumed sizes. Each model of each brand tire has its own spec sheet. On that sheet you’ll find the actual diameter, circumference and rotations per mile. You need this info to find the exact variation when you upsize.
Also note that even the same tire will read different numbers during its age as it’s diameter slowly decreases with wear.
Of course all of this is really overthinking the issue; however, I found this to be important in a car like R35 GTR that has a very sensitive 4 wheel drive differential and would read these minimal discrepancies as slip and overwork to correct.
Also note that even the same tire will read different numbers during its age as it’s diameter slowly decreases with wear.
Of course all of this is really overthinking the issue; however, I found this to be important in a car like R35 GTR that has a very sensitive 4 wheel drive differential and would read these minimal discrepancies as slip and overwork to correct.
#16
MBWorld Fanatic!
#18
MBWorld Fanatic!
I went the same way that Cyberorth did with 255 and 275 PS4s and I they have more traction and are quieter and I think ride better.
The reason is the 285 are listed for the 91/2 inch rims but not the preferred size as I don't think they give enough shoulder support.
I also think by keeping the ratio front and back to one size up for both might be better for the computer ESC and Traction control calibration mostly in the twisties and not drag runs.