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I have a bike on the way that will include nice aluminum Honsho fenders. I usually transport my bikes in roof racks that clamp to the fork. I can get a roof rack that doesn't use a full-length tray to accommodate the rear of the front fender. My question relates to the upper front lip of the front fender.

I'm concerned that the wind pressure from driving a couple hundred miles at highway speeds could fatigue, or maybe even bend, the upper lip of the front fender. Am I just being paranoid? I can mount the bike backwards, so the rear fender faces forward. But this would put the wind load on the rear fender stays. Is this any better?

Thanks.
 

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PdxMark said:
I have a bike on the way that will include nice aluminum Honsho fenders. I usually transport my bikes in roof racks that clamp to the fork. I can get a roof rack that doesn't use a full-length tray to accommodate the rear of the front fender. My question relates to the upper front lip of the front fender.

I'm concerned that the wind pressure from driving a couple hundred miles at highway speeds could fatigue, or maybe even bend, the upper lip of the front fender. Am I just being paranoid? I can mount the bike backwards, so the rear fender faces forward. But this would put the wind load on the rear fender stays. Is this any better?

Thanks.
I think you are just being paranoid. Haven't you ever had your bike up to 50+ before? If the fenders didn't buckle then they won't on the roof of your car.
 

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No probs w/plastic Zefals, but with aluminum...

I've carried my singlespeed with plastic fenders up to 80-85 for several hundred miles without any trouble, but I think your concern about aluminum might be valid. Don't see a fix for it, though, except to try it out. As for holding the speed to 50...doesn't seem realistic to me, but I live in the wide open West, where the de facto Interstate limit is 80+.
 

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sunroof?

PdxMark said:
I have a bike on the way that will include nice aluminum Honsho fenders. I usually transport my bikes in roof racks that clamp to the fork. I can get a roof rack that doesn't use a full-length tray to accommodate the rear of the front fender. My question relates to the upper front lip of the front fender.

I'm concerned that the wind pressure from driving a couple hundred miles at highway speeds could fatigue, or maybe even bend, the upper lip of the front fender. Am I just being paranoid? I can mount the bike backwards, so the rear fender faces forward. But this would put the wind load on the rear fender stays. Is this any better?

Thanks.
If you have a sunroof, you might be able to keep an eye on it. I would try driving a little more slowly at first, then see how it goes.

Would a bike bra cover the fender? That might help.

Doug
 

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no worries!

i have a cross bike that doubles as a commuter and tourer with fenders. i drive it regularly on the top of my jeep cherokee on the autobahn at 85-90mph with no issues whatsoever.
 

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No worries unless they start vibrating

The only risk to your Al fenders will come if you get a resonant vibration at a given speed. If the aluminum is subject to continous vibration, it will fatigue. Just wind pressure will not be a problem.
 

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The fenders should be fine

but if you have a mud-flap on the front one, you're gonna have to bend it at about 90 degrees to clear the tray. I've found this to be a minor problem when a crease develops in the flap.

-Ray
 

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some solutions:

I have one fork-mount carrier, and one 'standing' carrier on my roof rack. I usually have the 'standing' carrier mounted backwards (makes lifting a complete bike much easier on the passenger side, BTW), which keeps the wind from getting unter a front fender. I have 2 bikes with full fenders, and one of them is a classic roadster that I'm not going to carry using a fork mount.
Also, the fork-mount unit can be mounted backwards......
 
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