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Old 24-04-2018   #1
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Question about rear wheel moldings

Always wanted to ask... What's the purpose of those bent parts on the rear wheel opening moldings? The first time I saw one I thought it was a defect or something. Any ideas?
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Old 24-04-2018   #2
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Re: Question about rear wheel moldings

I believe that this flared part of the wheel arch, is there to pass homolongation rules for the USA market. More specifically, the distance of the wheel arch and the wheel must be at least X amount and when that is not the case then manufacturers raise the wheel arch just a tiny bit.

In some cases, the manufacturers don't make separate wheel arch parts for the USA market (like when the arch is not plastic), so they screw a set of extensions by hand.

I could be wrong, but at least that is what I remember. Please correct me if I'm wrong.
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Old 24-04-2018   #3
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Re: Question about rear wheel moldings

I think it's a styling/ aerodynamics aid. Always thought it looked a bit superfluous though.
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Old 24-04-2018   #4
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Re: Question about rear wheel moldings

Here is a video that shows the arch extension, on an Audi RS3 for the USA market (at 3:45 ...):

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Old 24-04-2018   #5
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Re: Question about rear wheel moldings

Good spot, it may well be that. For the widest 225 tyres they had to slightly increase the width of the tyrewell?

It's like mm's though on the fiat....i think.
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Old 25-04-2018   #6
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Re: Question about rear wheel moldings

Seriously, how does this small extension affect anything? I understand extending the whole arch, but only one short section? What's the practical point in it? Looks to me just like weaseling a way around the regulations.
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Old 25-04-2018   #7
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Re: Question about rear wheel moldings

Also, it doesn't seem to be exclusive to the US market. Here's a photo showing a UK version with the same arch extension.
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Old 25-04-2018   #8
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Re: Question about rear wheel moldings

Yes our UK car has them - I think they all do for the reasons Venezia has already stated. Nowt to do with aero - way to small - and slow(!) for that
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Old 26-04-2018   #9
Ohhh my, yes.
 
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Quote Originally Posted by Goodcoin View Post
Also, it doesn't seem to be exclusive to the US market. Here's a photo showing a UK version with the same arch extension.
That'll be for money's sake. Why have 2 different mouldings when it's required for one country but of no consequence in any other. One less thing to keep multiple stocks and production processes for.
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Old 26-04-2018   #10
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Re: Question about rear wheel moldings

Quote Originally Posted by Garree001 View Post
That'll be for money's sake. Why have 2 different mouldings when it's required for one country but of no consequence in any other. One less thing to keep multiple stocks and production processes for.
Yeah, that makes sense.
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Old 15-05-2018   #11
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Smile Re: Question about rear wheel moldings

Cant we come up with a better excuse when people ask.
Perhaps they serve a very minor role but lets them more exclusive,
they create an anti spray vortex to reduce spray at high speeds
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Old 15-05-2018   #12
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Re: Question about rear wheel moldings

Parked next to a Range Rover Evoque the other day, and that had the same type of wheelarch "extensions" as the 500X, but slightly bigger. I suspect it's an airflow management tweak.
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Old 15-05-2018   #13
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Re: Question about rear wheel moldings

Possibly an airflow tweak but the 500X is a brick at the front, brick at the rear, high ground clearance (no sneaky airflow & ground effect tweaks) etc.

Can't really imagine that the little lip is a medium/large/critical airflow feature.

Also since when did road car manufacturers give a monkeys about airflow disruption/turbulence, spray, etc behind them?
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Old 15-05-2018   #14
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Re: Question about rear wheel moldings

Anyone from the FCA or JLR design departments care to enlighten us?
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Old 15-05-2018   #15
Ohhh my, yes.
 
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Re: Question about rear wheel moldings

I was looking at them on car. The wheel arch mouldings without them don't extend the full width of the tyre. The bits that stick out however, do. I think they're there to stop spray and mud marks on the side of the car. Kind of a mini mud flap. Simple as that.
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