NeoGuard

I believe one of the mags ran a story on this a while back. You can easily make one using an old tube.

See here (Blondie's doesn't seem to be fastened to the fork properly):

Others have questioned the logic of this given the wheel rotates and throws mud backwards. I think it's meant to catch mud that would otherwise cling to the tire until it crossed under the fork at the top of the rotation and then let go. This mud would otherwise fly off forward and upward and end up in your face as you rode into it.

it would work..

I need to put one on my commuter as the water flips up and forwards and then you ride into it.. right at about eye level i've found..

annoying when you don't wear eye protection....

If you want to get technical though theoretically though anything flown forwards would never come into contact with the rider again as it would continue along and a faster velocity than the rider assuming they are not accelerating..

...but of course in reality the mud gets arrested by wind resistance and whilst you maintain your speed through cycling power, you power yourself right into the flung mud.

Whilst the schnichipoo works it would not stop the mud/water which is flung off after it has passed the fork arms which will still fly forward/up and still get you in the face. but it should be reduced at least. Or get the schnichipoo right up against the wheel and that should be pretty good....

Its like rolling a snowball along the snow it just get bigger and bigger as the now sticks and brings on more snow. Back in England I remember that the wheel was so clogged with mud that it just couldn't rotate so this DIY helps to keep the mud off and generating more mud

OK, maybe I was thinking in an 'ideal' scenario.

Then again head angle on my bikes is around 70 degrees. So this means mud can only go up at 20 degree max (assuming it doesn't go through the gap), right? In order for the mud to get high enough to hit your face at such a low angle it'd have to fly forward a fair way. Not sure that's going to happen.

The flap isn't going to stop mud build up on tyres Lorrie. It isn't a mud scraper! It only would stop build up on one's face

Now Gonz has no useful answers to his question but instead has been subjected to mud physics and a random snowball

I need time to draw a diagram to explain what i think happens, however if you imagine stuff just flyign off at tangents in all directions but the stuff that goes in your face is from you moving along and the wind resistance makes you feel like it actually blowing in back into your face from the stuff released from the 12 to 3 O'clock part where as most guards fit from like 1 back to 9 which will mostly just hit the fat tube on your bike and your legs more than your face.