vkam

I have installed G25 19x9.5 50mm rear and 19x8.5 45 mm front.

Comparing with stock 18" wheels, installation of G25 makes whole car more alive. Braking, acceleration is faster, turning is easier. It is like whole car becomes lighter and more nimble.
I think Michelin PSS (275/30/19) is a good match - they weight only 26 lb rear.
Majority of other tires are slightly heavier.

At the beginning I had a problem - vibration, more on high speed.
The cause was that the center bore of C63 is 66.5 mm and a wheel has 73.1mm. Mechanic installed these wheels without hub ring and they were not properly centered.
I improved the wheel centering, but still need to find good hub rings. Which manufacturer would be better, considering that it should not be plastic?

Roswell

The wheel looks great on ur car.. Good match with ur palladium silver!! A drop would set it off nicely.

deeoh

NICE! Excellent choice of tires too. Btw, curious to know the weight comparisons between oem vs. rays? Good luck with the hub centric rings, I wish I could offer some help...

Merc63

HR springs and it will be mint. If you have P30, you will love the ride. Not as stiff.

vkam

We did not have a scale at the mechanical shop to measure the rim weights.
As soon as I put my old setup back to wear them out, I will check it.
In the shop they had Rays RE30 I believe and G25 were slightly heavier I think.

Before I had the rotational mass gradually increased.
Rear tires were changed from Pirelli 255/35/18 (24 lb) to Bridgestone Potenza RE760 275/35/18 (28 lb).
Later I changed front Pirelli 235 (25 lb) to Bridgestone 245 (29 lb).
When I put 275 wheels first time, I was happy, that wheel spin was reduced. But it was reduced not only because tires become wider. The second reason was that they become heavier.
With all these wheels and rims on a drag strip my car with kleemann was not much faster than non-cpu modified c63 with original wheels.
I noticed a big difference when had lighter winter setup with replica wheels.
This shows me, that C63 needs to have light wheels to be alive

Fung63

the wheels look great! classy.

CELLryuu

i dont agree with getting the lowering springs. looks great just the way it is.

Strafe1

I installed some Volk TE37 TTA's a few months ago, and the wheels are hub centric. The G25's aren't?

natman316

Yeah was wondering the same thing, I thought the g25 were hub centric.

gthal

I had conflicting reports myself. I checked with the vendor and was initially told they were NOT hubcentric. Then, I was told they were. Now, they appear not to be. Had they been hubcentric, I would have bought a set.

angusw

great looking wheels ! i want 1 set too !

what's the color of the wheel ? is it silver or titanium ?

Merc63

I dont know why your so caught up with hubcentric? Centering rings are not a big deal. Ive run them at the track. They stick to the rim and not the hub for me. Which is not a big deal IMO

C63sydney

Can someone please explain "Hubcentric" and "Hubrings"

Thanks

gthal

I'm probably too paranoid about them, no doubt. I have had issues with metal rings fusing to the hub in the past and my logic is that it is just one more thing to deal with which you can avoid with a wheel built properly for the car. Plastic centering rings have and can melt with track use. Metal centering rings can and have fused to the hub and can be a real nuisance to get off. For some it isn't an issue but for me, I just hate dealing with that stuff. If the car was never tracked, I couldn't care less. For a car that is tracked, it feels like using band aids to get wheels to fit properly and then throwing them into a really abusive and demanding environment at the track.

gthal

The centre bore of some wheels is larger than the hub of the C63. Therefore, when you install the wheel, it does not sit firmly on the hub and that can cause vibration issues and also puts all of the load on the bolts. A centering ring is used to correct this. It is effectively a little ring that sits inside the wheel bore to allow it to properly mate to the hub. They can be plastic or metal. Plastic ones are known to melt from excessive heat at the track. Metal ones can sometimes fuse to the hub which makes putting other wheels on a pain as it is difficult to remove.

If the wheel bore does not match the hub, you need a centering ring to properly mount the wheel. OEM and other wheels made specifically for the car do not need these rings.

Rob@vividracing

Great looking wheels, Love the Rays quality. I bet they were a lot lighter than your factory wheels.

msheredy

I slight coating of some anti-seize should prevent that from happening in the future.

The thing I don't like about them is if you have to take your car to a Discount Tire (or similar) and they neglect to put them back on.