Suspension mods for better tire wear
Yes Toe (directional) adjustment is all that is available OEM (new car industry's best kept secret).
CAMBER - Allows to actually "change tire contact angles" to resolve costly, premature edge tire wear, improving traction / understeer / oversteer
CASTER - Correctly resolves steering pull, increases steering response. With better turn in and high speed directional control. Along with improved anti dive / lift under brake and acceleration.
We saw the need therefore to re-instate from the early 90's full precise adjustment capability - TO FIX IT RIGHT THE FIRST TIME. No more ongoing trips to dealers or alignment shops or constantly changing tire brands.
No above Camber and Caster adjustment is OK if maintained and driven at showroom height. But the reality of day to day commuting encountering high cambered roads or altered height through load carrying or lowering. Fitting wide profile tires / Wheels, Curb knocks.... Camber and Caster - full adjustment capability is essential.
For the front (only) you can fit inaccurate (one only offset position) fluted bolts - but they only offer a minimal 0.3 degrees (1/8").
The K-MAC patented design front kit provides up to 3 times the adjustment range of the "one position" bolts and is PRECISE SINGLE WRENCH ADJUSTABLE - accurately on car (under load) direct on alignment rack!
Extra feature is that the front kit replaces the 4 highest wearing suspension bushings and is mono ball /2 axis (self aligning) design without the OEM oil and air voids. Result is noticeably improved brake and steering response.
Rear kit also provides precise Camber adjustment for the first time (and extra Toe adjustment to compensate for the new Camber facility). Bush Extraction tool included allowing to fit on vehicle.
Other popular kits manufactured are front "replacement" top strut mounts (coil spring models) - for "Track days" Stage 2 (Street / Race) or Stage 3 (Full race) when wanting to reduce understeer - in the pursuit of hitting those corner apexes every time and going deeper into the corners with increased traction and braking response.
Also manufactured is uprated replacement bushings (12) for the '6' multi link rear arms. Providing significant improvement to rear end stability, less twitch / flex, loss of traction especially when applying power to lane change / overtake.
W212 incl. AMG
Front Camber and Caster kit #502916 K $480
Rear Camber (and extra Toe) kit #502226 $480
Stage 2 (Street / Race) Strut adjusters Camber and Caster kit #502916-2 L $545
Stage 3 (Full Race) Strut adjusters Camber and Caster kit #502916-3 L $545
Rear multi link arms performance bush kit (12) #502628 K $480
Delivery one kit $30 (each additional kit $20) PayPal, Visa or MasterCard.
See Web Site for complete listing / details Also front page can download catalog ( with page 3 - Quick Reference).
The vehicle has front drop springs.. not sure how much.. and it does pull to the right a little sooner than my other vehicles.
You said above that they installed the camber/caster bolts and did an alignment.
1. Is this still true?
2. Do you have a receipt?
3. Was this printout before and after that installation or were they stupid enough to have taken both these alignment specs after the bolts?
I will be home Thursday to show my settings after this was done. The reason that I ask is because camber is the same on your before and after settings. That is impossible if the bolts were really added. Caster would have changed too. Then toe should have been set around .05-.07.
Sounds like you were scammed. All they did is increase your toe and cause you worse problems.
If they want to argue if the bolts were installed you can tell by looking if a raised line is on top of the bolt head. It is there to doublecheck if they are aligned.
You said above that they installed the camber/caster bolts and did an alignment.
1. Is this still true?
2. Do you have a receipt?
3. Was this printout before and after that installation or were they stupid enough to have taken both these alignment specs after the bolts?
I will be home Thursday to show my settings after this was done. The reason that I ask is because camber is the same on your before and after settings. That is impossible if the bolts were really added. Caster would have changed too. Then toe should have been set around .05-.07.
Sounds like you were scammed. All they did is increase your toe and cause you worse problems.
If they want to argue if the bolts were installed you can tell by looking if a raised line is on top of the bolt head. It is there to doublecheck if they are aligned.
If yes then your alignment specs are impossible because the bolts change camber and caster.
If no then you were completely scammed.
Either way you need to get your money back and you need to find a really good alignment shop. I drive an hour to get to one.
The Best of Mercedes & AMG
Observations
Camber arms
1. Validate if camber bolts are installed. You are at -1.9 and I am at -.09 and -1.1 after install. Maybe your original camber was worse but you should check.
Caster arms
2. Leave OEM (without slots) caster bolt in driver side. 3. Install slotted bolt in passenger arm and pull inward.
The bolt will pull the caster arm inward and move the passenger wheel forward. This will eliminate your pull. You need another toe alignment after doing this because it throws that off. My toe is at .08 both sides so they could get a little better for you the next time too.
IM me and I can talk you through this if you have any questions. Once you draw the tires and arms on paper and see how they move with the bolts it makes sense.
It took me 3 trips to alignment shop after tweaking the slotted bolts but my camber and toe specs are awesome and there is zero pull to right.
F1 Fabrication is the only source for these.
Wikipedia has some simple and up to the point info on alignments:
https://en.m.wikipedia.org/wiki/Camber_angle
https://en.m.wikipedia.org/wiki/Toe_(automotive)
It mentions as one possible solution the use of eccentric bolts for camber correction. Don't know if this what those MB bolts do?
Also, toe out seems to balance the camber in, contrary to what has been suggested here.
Finally, it seems a trend on performance cars to give just toe alignment.
All this is pretty crazy as I can understand the difficult proposition of making a big, heavy and luxury car handle like a sports car, but how has Porsche or even BMW got their solutions to this that seem to be less rubber eaters and not based only on camber in "trick"?
Last edited by tonecas; Jan 6, 2019 at 04:51 PM.
i am going to put my car up on a lift and post a video. The basics are misunderstood.











