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Coroplast fenders

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Old 10-30-15 | 02:30 PM
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Coroplast fenders

I'd made up some quick temporary fenders last weekend for the remnants of Hurricane Patricia passing through and checked today to see how they were holding up. They're still fine so I thought I'd share for your amusement.

I cut a piece of cloroplast length-wise, about 1 3/4 inch wide, and bent it by hand and heat-gun around a wheel. Then a couple of strips from the fork to the back. A couple of tie-wraps and bits of inner tube to hold it together and:


the rear:

I think I'll leave them on permanently since, as you'll have to admit, they don't really detract from the overall look of the bike.
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rear fender.jpg (96.0 KB, 67 views)
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front fender.jpg (91.5 KB, 71 views)
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Old 10-30-15 | 09:03 PM
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I wouldn't want to let loose with a snot rocket in there or do any crop dusting. Nice fenders, though.
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Old 10-30-15 | 09:23 PM
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Two thoughts.....

1: Perhaps something to block clean air from the pumping legs, feet and crankset.......

2: Some way to check traffic from behind...as in changing lanes??!!?!?! ..Can't always make right turns.

Otherwise..............innovative use of the thousands of political yard signs that are soon to be tossed to landfills.

All in all---good job.
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Old 10-30-15 | 09:42 PM
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Going for the Darth Vader look? That thing would scare the crap out of me if I saw you coming up from behind.
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Old 10-31-15 | 08:52 AM
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I Put on my cycle Rain cape and hat to stay dry .. roll it all up and stow it when un needed.

but thanks for sharing..
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Old 10-31-15 | 10:21 AM
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Originally Posted by alan s
Going for the Darth Vader look? That thing would scare the crap out of me if I saw you coming up from behind.
Military stealth look, I'm tempted to mock up a rocket launcher tube.

Truth is I didn't want to mess with paint, and black was the only choice in a reasonable price and quantity.

Originally Posted by gregjones
Two thoughts.....

1: Perhaps something to block clean air from the pumping legs, feet and crankset.......

2: Some way to check traffic from behind...as in changing lanes??!!?!?! ..Can't always make right turns.

Otherwise..............innovative use of the thousands of political yard signs that are soon to be tossed to landfills.

All in all---good job.
It's not as big as it seems from the pictures. I have to be in the drops with a horizontal back to be below the windscreen.

I'd like to block off the lower legs but it's not really possible given toe overlap with the front wheel.

Given the trouble and angst people go through about fenders, I just thought it was cool that you can whip one together in half an hour out of cloroplast and inner tubes and it actually holds up, perhaps indefinitely, in weather that most commuters won't get caught out in.

Originally Posted by fietsbob
I Put on my cycle Rain cape and hat to stay dry .. roll it all up and stow it when un needed.

but thanks for sharing..
So do I - not a rain cape which is way too much hassle IMO but a light rain slicker. This is so beyond that, if I may be immodest, that it's addicting.
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Old 10-31-15 | 10:29 AM
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Our Locations Differ, so Does the weather ..
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Old 10-31-15 | 10:37 AM
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Originally Posted by fietsbob
Our Locations Differ, so Does the weather ..
Yeh, we get more rain. Heavy rains I mean, not more days or inches.

But you're right, different equipment for different environs. You'd be surprised though.

Last edited by wphamilton; 10-31-15 at 10:41 AM.
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Old 10-31-15 | 10:41 AM
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Need Data not Opinions.

It's raining for a week here .. & 'winter' has Not started Yet..

But You can Keep the Hurricanes for Your own Joy & Pleasure..

How Much Have You spent on storm Damage Repair?

Last edited by fietsbob; 10-31-15 at 10:47 AM.
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Old 10-31-15 | 10:56 AM
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Jeff Willis inspired?
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Old 10-31-15 | 10:57 AM
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Originally Posted by fietsbob
It's raining for a week here .. & 'winter' has Not started Yet..
But You can Keep the Hurricanes for Your own Joy & Pleasure..
I'm more about freezing rain and colder weather with this setup. This rain and mid-40's is actually a bit warm for that beast.

I just slapped fenders on because I knew that the Patricia system from Mexico would be blowing through. That was over by Thursday but I'll keep the fenders I think.
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Old 10-31-15 | 11:01 AM
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Originally Posted by fietsbob
Need Data not Opinions.

It's raining for a week here .. & 'winter' has Not started Yet..

But You can Keep the Hurricanes for Your own Joy & Pleasure..

How Much Have You spent on storm Damage Repair?
Data for what? Rainfall? I've ridden through all of it, fietsbob which is enough for me, but you can look up that we get more rain and heavier rains than Portland OR if you wish, and less than the wetter parts of Oregon.
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Old 10-31-15 | 11:05 AM
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Originally Posted by dksix
Jeff Willis inspired?
Independently inspired for my own purposes, but my contraption isn't in the same league as Jeff Willis velos.
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Old 10-31-15 | 11:09 AM
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Im 7 miles in From the Ocean Columbia River is a Block away* Portland is the Big city 2 hours Drive time Inland

behind the coast Range, Its sheltered more..

* guess if you wish hint: This town is the oldest one west of the rockies

Last edited by fietsbob; 10-31-15 at 11:14 AM.
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Old 10-31-15 | 03:21 PM
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Originally Posted by fietsbob
Im 7 miles in From the Ocean Columbia River is a Block away* Portland is the Big city 2 hours Drive time Inland

behind the coast Range, Its sheltered more..

* guess if you wish hint: This town is the oldest one west of the rockies
Astoria
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Old 10-31-15 | 03:51 PM
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Our Georgia peach didn't want to Play, just the 'it rains more here' Pissing match
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Old 10-31-15 | 08:33 PM
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That's a nice idea. I've always been leery of plastic fenders because the vinyl ones I've had in the past tended to shatter in cold weather. I have some MTB fenders for my winter bike, that are polyethylene, and hold up quite well, but are not full length. Your solution looks pretty good.
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Old 10-31-15 | 08:55 PM
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Originally Posted by fietsbob
Our Georgia peach didn't want to Play, just the 'it rains more here' Pissing match
I never quite get what you're trying to say. No offence.
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Old 10-31-15 | 10:18 PM
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Pretty good but I wonder how much you're missing from "real" fenders, especially the gutter effect from the ridges on the edges.
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Old 11-01-15 | 01:00 AM
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Having just spent some time tonight putting on a rear fender, I applaud the ingenuity. Well done if it works.
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Old 11-01-15 | 10:15 AM
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Originally Posted by Darth Lefty
Pretty good but I wonder how much you're missing from "real" fenders, especially the gutter effect from the ridges on the edges.
Excellent question! As it turns out, I did some experiments on that last year, or maybe it was two years ago. I was primarily checking how far down the rear fender needs to extend (all the way). Just some tests, not rigorous science.

I started with several clean white t-shirts, my road bike and a cruiser we had with full fenders, and muddy puddles after a rain. My conclusion was that you need full length fenders (curved all the way to vertical) to prevent splatter on your back, but there was no discernible difference between the curved commercial fenders and flat ones like these. I didn't check the front - I'd expect at least some difference since we have more exposure as it moves left and right, but I do know that it's effective. I have sturdier aluminum ones on my main ride.
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Old 11-01-15 | 10:21 AM
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Originally Posted by Gresp15C
That's a nice idea. I've always been leery of plastic fenders because the vinyl ones I've had in the past tended to shatter in cold weather. I have some MTB fenders for my winter bike, that are polyethylene, and hold up quite well, but are not full length. Your solution looks pretty good.
I'd be reluctant to try this if they got caked up with snow and ice. Who knows though. I'm not really in a position to test it with our half-inch average annual snowfall.
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Old 11-02-15 | 09:13 AM
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Originally Posted by brockd15
Having just spent some time tonight putting on a rear fender, I applaud the ingenuity. Well done if it works.
Thanks. Pretty good test today, half an inch of rain so far. I didn't have any splash on my lower legs this morning so it works for that at least.
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