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Old 12-20-08, 08:09 PM   #1
KungPaoSchwinn
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How fenders work? Technically

Hello friends,merry x'mas to everyone.i know fenders on bicycles works like mud flaps on cars or trucks, am i right? if so, how do they keep mud/water/dirt from hitting on the rider?
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Old 12-20-08, 08:38 PM   #2
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Usually the centripetal acceleration will cause mud and debris to fly off the rear wheel in tangential directions, splattering your lower spine region and tailbone. I have a makeshift fender made from a large plastic blind.
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Old 12-20-08, 08:51 PM   #3
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^^^yep. I have some nice fenders for my commuter bike, but I just don't really like them. Glad I didn't spend anything on them. If you live/ride in a really rainy area, then I'm sure they're great, but otherwise...
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Old 12-20-08, 08:55 PM   #4
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Usually the centripetal acceleration will cause mud and debris to fly off the rear wheel in tangential directions, splattering your lower spine region and tailbone. I have a makeshift fender made from a large plastic blind.
Like he says. If you have good rain gear YOu do not need fenders as much as your bike needs them to keep road filth from getting into the works.
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Old 12-20-08, 10:02 PM   #5
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Like he says. If you have good rain gear YOu do not need fenders as much as your bike needs them to keep road filth from getting into the works.
Prior to mounting full fenders, which included a front fender, I used to end my rainy commutes with an oily taste in my mouth from the water thrown up off the road from the front tire. With full fenders, the only rain getting on me is falling from the sky where it is hopefully a little cleaner and certainly taste better.
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Old 12-20-08, 10:14 PM   #6
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Yeah, the only fenders that work on really wet roads are full fenders, and I mean full: inlcuding one on the rear which goes right down the front of the wheel, preferably beyond the chain-stay; and a widely flared front fender. Even then, when you ride fast enough, the spray hits the guards so hard that you get fine spray off the guards which makes you wet.
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Old 12-21-08, 01:44 AM   #7
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how do they keep mud/water/dirt from hitting on the rider?
It's the barrier method. Same as condoms.
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Old 12-21-08, 06:36 PM   #8
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Like he says. If you have good rain gear YOu do not need fenders as much as your bike needs them to keep road filth from getting into the works.
good rain gear may keep you dry with or without fenders, but the idea of getting a vertical stripe of road grime and grit spattered on my rain gear is not exactly appealing.

i'll take full coverage fenders any day, if only to keep my rain gear from getting disgusting.

another tip on keeping feet dry: add a wide mud flap to the bottom of the front fender. that will catch a lot of the lateral spray from the water siping out from the tire tread during really heavy rain. that lateral spray often lands right on the feet.
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Old 12-21-08, 06:41 PM   #9
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Hello friends,merry x'mas to everyone.i know fenders on bicycles works like mud flaps on cars or trucks, am i right? if so, how do they keep mud/water/dirt from hitting on the rider?
You're trolling, right?
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Old 12-21-08, 06:52 PM   #10
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You're trolling, right?
I think he is. Besides, the condom answer captures the main point - sheesh.
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Old 12-21-08, 09:27 PM   #11
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without fenders, the water caught or put out from the tires will spray up onto you. full, wide fenders work best.
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Old 12-21-08, 11:26 PM   #12
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fenders

10 serious replies to this question????????
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Old 12-22-08, 01:07 AM   #13
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I only ride fenders if they have lots of fine holes (at regular intervals) through them. This works kind of like the new dimpled-surface swimsuit technology and makes my bike more aerodynamic.
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Old 12-22-08, 01:39 AM   #14
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I only ride fenders if they have lots of fine holes (at regular intervals) through them. This works kind of like the new dimpled-surface swimsuit technology and makes my bike more aerodynamic.
Have you thought about Honjo Fenders? These work in much the same way a golf ball does. It should help keep your bike upright and traveling in a straight line.

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Old 12-22-08, 01:56 AM   #15
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those look nice, but I'd miss the fine mist that comes through the holes in my fenders, creating an environmental ambiance that is unsurpassed outside of rainforest-rooms at the zoo
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Old 12-22-08, 02:02 AM   #16
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those look nice, but I'd miss the fine mist that comes through the holes in my fenders, creating an environmental ambiance that is unsurpassed outside of rainforest-rooms at the zoo
ah...good point. I hadn't thought about that. Have you tried Henson's Invisifenders?



The are made with special oil emitting holes that actually send a light mist of oil mixed with the water mist. This helps moisturize your skin during a long ride.

I also think they look pretty good.
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Old 12-22-08, 06:26 AM   #17
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Originally Posted by timcupery View Post
I only ride fenders if they have lots of fine holes (at regular intervals) through them. This works kind of like the new dimpled-surface swimsuit technology and makes my bike more aerodynamic.
I heard Trek is coming out with soem of these, can't wait!!!
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Old 12-22-08, 06:32 AM   #18
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Ok, just to answer mechanically:

Wheels are spinning, water flies off wheels. With a fender, the water hits the fender and doesn't go any further, in fact it drips down to the ground along the inside surface. Without a fender, the water and all the other crud on the ground (oil, brake dust, remnants of road kill, dog/cat/other droppings, dumpster runoff) is flung onto your bike and onto you and your clothing. Holes in fenders are a bad idea, so are fenders that are too short or too narrow. Wider tires need wider fenders. Wider fenders need wider frame gaps, and usually wider and longer brake calipers. Hence the Freddish look of many bikes with fenders, and part of the popularity of '80s/'90s sport-tour frames for weather bikes.

That's how they work.

All the rest is vanity.
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Old 12-22-08, 08:59 AM   #19
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UnsafeAlpine, that bike you posted looks very similiar to mine except mine has more spokes and a different handlebar, Yes i am trolling for knowledge that i don't have,btw, those invisible fenders are really invisible? I saw some bikes from Asia which have rubber flaps at the bottom of there fenders to add more protection, those people take bicycles very seriously...http://www.crazyguyonabike.com/doc/t...c_id=1313&v=s0
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Old 12-22-08, 09:05 AM   #20
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Here's a question though. With full rear fenders, does dirty grit filled water drip off of them onto the drivetrain?
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Old 12-22-08, 09:19 AM   #21
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Fenders generate a fred effect repulsion field that causes the water drops to fly away from the rider. That said, I have fenders for all of my bikes.
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Old 12-22-08, 09:45 AM   #22
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Here's a question though. With full rear fenders, does dirty grit filled water drip off of them onto the drivetrain?
only if you are riding backwards...

for forwards you should extend the front fender pretty low with a flap of some sort .. leather, rubber etc so that the drip is lower than your drivetrain
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Old 12-22-08, 12:09 PM   #23
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That pic with the leather flap is what seems to block the whatever to hit the rider,do you guys think they look ok on my bike? Tommorow will rain here and i will shoot a video and study at what angles the water projects to the rider at different speed.
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Old 12-22-08, 12:16 PM   #24
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These are the nicest for the money fenders I've run across. I've been really happy with mine.
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Old 12-22-08, 03:51 PM   #25
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Here's a question though. With full rear fenders, does dirty grit filled water drip off of them onto the drivetrain?
The majority of the dirty grit will just follow the contours of the fenders to the ground. Without fenders, there will be more mud and crud flung onto your drivetrain, not to mention yourself (mud stripes front and back). Fenders are easy to put on and take off, don't see what the big deal is. Doubt many at this forum would install a full or half chaincase either.
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