Tire recommendations
Senior Member
Joined: Jun 2019
Posts: 453
Likes: 91
From: DFW, Texas
2017 AMG C63
I went 255/40 on the front, closer, but a little larger, to stock (245/40) diam.
Recommend 285/35 on rear, again because larger yet closer to stock (265/40) diam.
If you did go with sizes you mentioned, the new tires' overall rolling diam will be smaller than stock. This will give a slightly shorter overall gearing thus slightly increase accel, at same time decreasing contact patche sizes and this traction. ( remember even with a wider tire, the contact patch is simply reshaped but retains the same total area, assuming the overall tire diameter stays the same. Tire diameter has a bigger effect on contact patch size - taller tire increases it, shorter tire decreases it.) Also will of course lower the entire vehicle by the difference in diameter height, probably close to half an inch.
Our cars, esp sedans, need traction much more than a very slight increase in acceleration.
Recommend 285/35 on rear, again because larger yet closer to stock (265/40) diam.
If you did go with sizes you mentioned, the new tires' overall rolling diam will be smaller than stock. This will give a slightly shorter overall gearing thus slightly increase accel, at same time decreasing contact patche sizes and this traction. ( remember even with a wider tire, the contact patch is simply reshaped but retains the same total area, assuming the overall tire diameter stays the same. Tire diameter has a bigger effect on contact patch size - taller tire increases it, shorter tire decreases it.) Also will of course lower the entire vehicle by the difference in diameter height, probably close to half an inch.
Our cars, esp sedans, need traction much more than a very slight increase in acceleration.
Last edited by LessIsMore; Apr 12, 2020 at 01:09 AM.
Newbie
Joined: Jun 2020
Posts: 9
Likes: 1
From: Dallas, Texas
2018 C63 Sedan
I went 255/40 on the front, closer, but a little larger, to stock (245/40) diam.
Recommend 285/35 on rear, again because larger yet closer to stock (265/40) diam.
If you did go with sizes you mentioned, the new tires' overall rolling diam will be smaller than stock. This will give a slightly shorter overall gearing thus slightly increase accel, at same time decreasing contact patche sizes and this traction. ( remember even with a wider tire, the contact patch is simply reshaped but retains the same total area, assuming the overall tire diameter stays the same. Tire diameter has a bigger effect on contact patch size - taller tire increases it, shorter tire decreases it.) Also will of course lower the entire vehicle by the difference in diameter height, probably close to half an inch.
Our cars, esp sedans, need traction much more than a very slight increase in acceleration.
Recommend 285/35 on rear, again because larger yet closer to stock (265/40) diam.
If you did go with sizes you mentioned, the new tires' overall rolling diam will be smaller than stock. This will give a slightly shorter overall gearing thus slightly increase accel, at same time decreasing contact patche sizes and this traction. ( remember even with a wider tire, the contact patch is simply reshaped but retains the same total area, assuming the overall tire diameter stays the same. Tire diameter has a bigger effect on contact patch size - taller tire increases it, shorter tire decreases it.) Also will of course lower the entire vehicle by the difference in diameter height, probably close to half an inch.
Our cars, esp sedans, need traction much more than a very slight increase in acceleration.
Member
Joined: Jun 2017
Posts: 117
Likes: 25
2017 C63S AMG
I’ve been seeing a ton of people asking for answers to be spoon fed to them instead of reading through an entire thread or simply browsing the forum. If you’re too lazy or too busy to do that, the following applies:
Stick with stock everything If you’re too busy or reading is too hard or you’d prefer not to delve into the wonderful world of modifying super expensive vehicles. You absolutely need to know what you’re doing before changing a single component to anything other than factory on these cars. Asa a heavily modified amg owner, I have had to do massive amounts of research as our performance market is newly exploding with options.
It’s easier, less expensive and 100% less traumatic when the dealer hands you a a heart attack sized service bill. One piece of bad info from someone on the internet without knowing better could be a $75,000+ mistake.
dudes suggestion was spot on btw. I went with 285/35/19 Bridgestone RE71R’s as they’re beefy af and size larger than other comparable tires. Stock size/35 series up front.
Last edited by Wexlax732; Jun 24, 2020 at 07:35 PM.
