[dsi]

Are there any nice aftermarket wheel options available? If I have been doing web searches however not seeing many options at all.

 

[falb]

HRE makes at least two options and is one of a very short list of companies I would trust to put wheels on a McLaren. Contact Lon and he will hook you up.

http://teamspeed.com/forums/mclaren/73637-white-mclaren-mp4-12c-hre-p44sc-gloss-bronze.html

 

[Markjayw]

Look too much like the factory SL wheels, why spend the extra money?

 

[Chest Rockwell]

Have see these in person, they look fantastic!

http://www.purwheels.com/portfolio/mclaren/mclaren-mp4-12c/

 

[benjiwengy]

Get a set of these. Go on, you know you want to

http://www.carbonfibergear.com/weds-sport-full-carbon-fiber-wheel/


Is 2.76 kg light for a wheel?

 

[benjiwengy]

Ooops, sorry but I think this is what you want.

http://carbonrev.com/

Looks like they make them specifically for the McLaren too.

 

[Markjayw]

Ok, now those would be an upgrade / improvement.

 

[McDc]

Is 2.76 kg light for a wheel?

2.76 kg (regardless of the actual size) is extremely light. Superlight wheels made from aluminum are around 7-9 Kg depending on size.

 

[andy c]

Ooops, sorry but I think this is what you want.

http://carbonrev.com/

Looks like they make them specifically for the McLaren too.

Idea and looks and performance are great,but the slightest sniff of a kerb and they must be toast ??? So for performance driving they are not going to work surely??

 

[qvpower]

funny how they only have 19 inch available yet somehow it fits onto a 20" rear for the mclaren? I think the problem with carbon wheels is the longevity of the wheels themselves. Over time they develop microscopic cracks that weaken the wheels. Yes, they are great for weight but once weakness of those microscopic cracks supersede the load, a complete and catastrophic failure.. That is just how carbon works... Also, Im not sure about resin withstanding the heat and cold cycles that a wheel is subjected to... Those will be the points of my concern on carbon wheels...

 

[benjiwengy]

Idea and looks and performance are great,but the slightest sniff of a kerb and they must be toast ??? So for performance driving they are not going to work surely??

Don't the Superlights need binning after nerfing a kerb? With the advances in cf manufacture I'd expect these wheels to be much more reliable than aluminium or magnesium. No stress fatigue for starters ( one of the major advantages of the 12c over aluminium uni-cell cars).

Ok, you do need to be careful when parking, but come on, they do look the mutts.

 

[Mac 1]

i ordered a set of Cor 20" forged concave super lites w/supersport's for my spider. ill post pics when they are ready.

 

[qvpower]

Don't the Superlights need binning after nerfing a kerb? With the advances in cf manufacture I'd expect these wheels to be much more reliable than aluminium or magnesium. No stress fatigue for starters ( one of the major advantages of the 12c over aluminium uni-cell cars).

Ok, you do need to be careful when parking, but come on, they do look the mutts.

The carbon wheels are subject to much more dynamic forces in terms of pressure and fluctuations in cold and hot. Depending on the resin that they use would determine how durable the wheel will be... Resin selection is key and if the resin selection degrades over time... wheels can go bye bye after a few years. The dymag wheels with the carbon barrel had inferior resin which caused flaking and eventual leakage in air...

 

[Markjayw]

Another issue with Superlight wheels is a reduction in high speed stability. Going lighter than the factory McLaren MP4 would not probably be an improvement IMO.

 

[997]

With the advances in cf manufacture I'd expect these wheels to be much more reliable than aluminium or magnesium. No stress fatigue for starters ( one of the major advantages of the 12c over aluminium uni-cell cars).
.

Why would there not be fatigue in CF?

 

[benjiwengy]

Another issue with Superlight wheels is a reduction in high speed stability. Going lighter than the factory McLaren MP4 would not probably be an improvement IMO.

Is that from experience, as I'd have thought the gyroscopic effect on stabilising a car would be minimal?

I've heard that losing 1kg of unsprung weight is worth many times that of sprung, particularly if it's rotating. So losing 1kg per corner could give you the same braking, accelerating and extra grip levels as losing 40kg off the body.

 

[TougeSpirit]

CF composites don't really fatigue in the natural sense like Al or even steel. It can have a type of fatigue if the resin does not maintain the structure due to aspects like temperature and humidity or UV causing delamination, but it is very different from metals. All in all, you can almost say that there is no fatigue due to cyclical loading up to the limit of the elasticity.

The main concern here is impact resistance. This can be modeled using Finite Element Method, but not sure what assumptions are made with regards to impact forces and vectors

 

[Markjayw]

Is that from experience, as I'd have thought the gyroscopic effect on stabilising a car would be minimal?

I've heard that losing 1kg of unsprung weight is worth many times that of sprung, particularly if it's rotating. So losing 1kg per corner could give you the same braking, accelerating and extra grip levels as losing 40kg off the body.

Yes true, but lighter wheels do affect high speed stability. You can feel the difference.

 

[997]

All in all, you can almost say that there is no fatigue due to cyclical loading up to the limit of the elasticity.

It has been a LONG time since I last looked at things like fatigue creep etc. IIRC then it affects plastics as well hence my question why it would not affect CF. When I say a LONG time ago I mean before everybody had a PC (or Mac) and CF was hardly used at all.

 

[qvpower]

Yes true, but lighter wheels do affect high speed stability. You can feel the difference.

With shocks keeping wheels contacting the ground, and downforce pushing down, lighter wheels will not affect high speed stability...