beroo

Hey guys,

I have a 2013 C300 4Matic Sport (staggered setup, so no rotation, R17, 225/45 Front and 245/40 Rear tire) and it burn through rear tires really fast. The most I've gotten out of them has been ~15000-18000KM. I have
Michelin Pilot Sport A/S 3+. However, only rear tires wear so fast and front ones last almost 2 times more. A few mechanics have told me that this is normal and since 4Matic starts spinning from rear first, so it usually wears them faster.
Is this really true? How much other owners get out of their tires?

I also finally took it to a local recommended shop (in vancouver) for an alignment and they said the toe was off but the camber on rear ones is not adjustable. Is that true? and does any one know what's the recommenced values for Camber? Is there any point in taking it to the dealer mechanics?
I've attached my alignment readings before and after. The wear was really bad inside of rear tires, could the toe be the culprit?

Thanks


Alignment results:

wvien

I used the SPC Alignment bushings 28855 to adjust the rear camber after lowering my E350. You'll also need the bushing press adapter 75990 to press them in.

K-Mac

Yes, that's right because of cost savings and ever increasing speed of auto assembly lines Front Camber and Caster along with rear Camber have been deleted.

Only OEM adjustment now is front and rear Toe (directional adjustment).

No longer the ability to adjust tire contact angles to correctly resolve costly, premature edge tire wear.

Uneven wear brought about by other than showroom height conditions - day to day commuting encountering high cambered roads, wheel squat through load carrying or lowering, fitting wide profile tires/wheels, worn bushings, curb knock damage.

We saw the need therefore to re instate from the early 90's front Camber and Caster. Rear Camber (and extra Toe to compensate).

These KMAC kits replace at the same time the 4 front and rear highest wearing suspension bushings. Come complete with bush extraction tools.

Unique patented design allows precise single wrench adjustment. Accurately (under load), direct on alignment rack. Providing up to "5 times" the adjustment range of the inaccurate (one offset position) Camber bolts

W204 (all incl AMG and Black series)
Front Camber & Caster #502616 K $480
Rear Camber (& extra Toe) #502226 K $480
Rear Uprated bush kit for the 6 multi link arms
(less rear end flex, loss of traction) #502628 K $480

ALSO MANUFACTURED (EXTRA Front Camber & Caster - Track Days)
(Replacement Front top strut mounts) - up to 3 extra degrees)
STAGE 2 STREET / RACE #503016-2 L $545
STAGE 3 FULL RACE #503016-3 L $545

Delivery $30 one kit (($20 each extra)

Payment can be made by PayPal, Visa or M/Card

ktmrider203

I also used the SPC kit and the recommended press kit on 2014 C250. Was not a difficult job and came with instructions . Had to guess at new camber by careful noting of rotation of eccentric bolt . Found that zero camber makes car unsuitably unstable at highway speeds so went to positive camber since not driving it hard through corners anyway . This solved inner circumference tire wear problem and car is stable at all speeds up to tested limit of 80 mph . Can actually see camber at tire/ground looking from rear or car forward . Only wish SPC parts were US or Euro production . China , yuk . Wonder how long bushings will last as have had on car for about a year . I did chamfer the bushing metal edge with dremel grinding stone to assist it going in to suspension arm in proper alignment as it wanted to tilt while pressing initially .

95viper

Mercedes does sell camber/caster bolts for front only. They are a fixed adjustment so will help but not fully adjustable like bushings or arms. Cost is like $50 compared to $500. Easy to diy with basic skills. Hardest part is to ensure that the slots on the bolt stay in alignment with the arms so the tabs go into the slots.

95viper

Looks like they did a nice job on your alignment. That contributed to your wear.
Adjustable bushings or arms are the only way to get better but expensive. So are tires though.

NZ-Merc

I dont see any problem with the figures you have, resetting the tow in is usually only adjustment available.

Excessive angles:
Tow out wears inside edge
Tow in wears out side edge

- or + camber wears the tyre like a wedge across the tyre width.