Advertise on Bikeforums.net



User Tag List

Results 1 to 25 of 25
  1. #1
    Senior Member KungPaoSchwinn's Avatar
    Join Date
    Nov 2008
    Location
    Ms/Ca, USA,Earth.
    My Bikes
    2009 Trek FX 7.3 ( pimp moment )
    Posts
    705
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    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?
    2009 Trek FX 7.3

  2. #2
    Junkmaster
    Join Date
    Aug 2007
    Location
    Arcadia, California
    My Bikes
    Lemond "Alpe d'Huez," several X-marts, and two Trek hybrids
    Posts
    133
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    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.

  3. #3
    on your left.
    Join Date
    Nov 2007
    Location
    Blacksburg, VA
    My Bikes
    Scott SUB 30, Backtrax MTB
    Posts
    1,802
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    ^^^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...
    Quote Originally Posted by caloso View Post
    I learned this the hard way. They say that experience is the best teacher, but I would have been preferred to just read about it on the internet.

  4. #4
    Senior Member ken cummings's Avatar
    Join Date
    Dec 2005
    Location
    northern California
    My Bikes
    Bruce Gordon BLT, Cannondale parts bike, Ecodyne recumbent trike, Counterpoint Opus 2, miyata 1000
    Posts
    5,605
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by facial View Post
    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.
    This space open

  5. #5
    Senior Member
    Join Date
    May 2004
    Location
    Wilmington, DE
    My Bikes
    2003 Specialized Hardrock, 2004 LOOK KG386i, 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1
    Posts
    8,849
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ken cummings View Post
    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.

  6. #6
    Aluminium Crusader :-)
    Join Date
    Apr 2004
    Location
    Melbourne, Australia
    Posts
    9,880
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    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.

  7. #7
    BeaverTerror Yan's Avatar
    Join Date
    Jan 2006
    Location
    Shanghai, China
    My Bikes
    2013 True North custom touring; 2009 Unicycle.com Club Uni; 1989 Miele Tivoli; 1979 Colnago Sport
    Posts
    1,593
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by KungPaoSchwinn View Post
    how do they keep mud/water/dirt from hitting on the rider?
    It's the barrier method. Same as condoms.
    Yan

    2013 True North custom touring; 2010 Novara Randonee; 2009 Unicycle.com Club 24"; 1989 Miele Tivoli; 1979 Colnago Sport

  8. #8
    Senior Member southpawboston's Avatar
    Join Date
    Aug 2008
    Location
    Somerville, MA and Catskill Mtns
    My Bikes
    '71 Mercian, '72 Jeunet, '82 Jack Taylor, '13 Rawland
    Posts
    3,542
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ken cummings View Post
    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.

  9. #9
    Senior Member
    Join Date
    Sep 2008
    Posts
    201
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by KungPaoSchwinn View Post
    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?

  10. #10
    Senior Member Road Fan's Avatar
    Join Date
    Apr 2005
    Location
    Ann Arbor, MI
    My Bikes
    Terraferma 650b, Mondonico SL and ELOS, Masi Gran Criterium, Trek 610, Breezer Liberty, Georgena Terry Classic
    Posts
    11,097
    Mentioned
    6 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by mike_s View Post
    You're trolling, right?
    I think he is. Besides, the condom answer captures the main point - sheesh.

  11. #11
    Senior Member
    Join Date
    Sep 2008
    Location
    yreka, ca
    My Bikes
    like 15. my favorite a 1951 schwinn spitfire cruiser. also have a 1959 amf roadmaster, 1962 jch deluxe cruiser among others.
    Posts
    542
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    without fenders, the water caught or put out from the tires will spray up onto you. full, wide fenders work best.

  12. #12
    Senior Member
    Join Date
    Nov 2008
    Location
    Seattle
    My Bikes
    Trek Madone, Trek TX900, Serotta CSI, Performance Scattante Elite
    Posts
    129
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    fenders

    10 serious replies to this question????????
    Martin

    85 Merckx 753 Professional
    92 Merckx Corsa
    00 Serotta CSI
    07 Scattante CFR

  13. #13
    me have long head tube TallRider's Avatar
    Join Date
    Oct 2005
    Location
    Chapel Hill, NC
    Posts
    4,097
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    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.

  14. #14
    Domestic Domestique UnsafeAlpine's Avatar
    Join Date
    Dec 2007
    Location
    Michigan
    My Bikes
    Brand New Old Catamount! Schwinn Homegrown, Specialized FSR, Salsa Vaya, Salsa Chile Con Crosso
    Posts
    1,736
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote 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.
    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.


  15. #15
    me have long head tube TallRider's Avatar
    Join Date
    Oct 2005
    Location
    Chapel Hill, NC
    Posts
    4,097
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    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

  16. #16
    Domestic Domestique UnsafeAlpine's Avatar
    Join Date
    Dec 2007
    Location
    Michigan
    My Bikes
    Brand New Old Catamount! Schwinn Homegrown, Specialized FSR, Salsa Vaya, Salsa Chile Con Crosso
    Posts
    1,736
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by timcupery View Post
    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.

  17. #17
    Senior Member Road Fan's Avatar
    Join Date
    Apr 2005
    Location
    Ann Arbor, MI
    My Bikes
    Terraferma 650b, Mondonico SL and ELOS, Masi Gran Criterium, Trek 610, Breezer Liberty, Georgena Terry Classic
    Posts
    11,097
    Mentioned
    6 Post(s)
    Tagged
    0 Thread(s)
    Quote 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!!!

  18. #18
    Senior Member Road Fan's Avatar
    Join Date
    Apr 2005
    Location
    Ann Arbor, MI
    My Bikes
    Terraferma 650b, Mondonico SL and ELOS, Masi Gran Criterium, Trek 610, Breezer Liberty, Georgena Terry Classic
    Posts
    11,097
    Mentioned
    6 Post(s)
    Tagged
    0 Thread(s)
    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.

  19. #19
    Senior Member KungPaoSchwinn's Avatar
    Join Date
    Nov 2008
    Location
    Ms/Ca, USA,Earth.
    My Bikes
    2009 Trek FX 7.3 ( pimp moment )
    Posts
    705
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    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
    2009 Trek FX 7.3

  20. #20
    Senior Member MrCjolsen's Avatar
    Join Date
    Nov 2004
    Location
    Davis CA
    My Bikes
    Surly Cross-Check, '85 Giant road bike (unrecogizable fixed-gear conversion
    Posts
    3,954
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Here's a question though. With full rear fenders, does dirty grit filled water drip off of them onto the drivetrain?

  21. #21
    Senior Member cheg's Avatar
    Join Date
    Sep 2004
    Location
    Seattle
    My Bikes
    1974 Raleigh International (RIP), 1975 Raleigh Twenty Folder, 1983 Diamondback Ridgerunner, 2008 Davidson Custom Titanium, Burley Duet Tandem, 1981 Shogun Touring Bike
    Posts
    798
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    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.

  22. #22
    Senior Member Jakedatc's Avatar
    Join Date
    Oct 2007
    Location
    Lil Rhody
    Posts
    2,099
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by MrCjolsen View Post
    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
    2007 CSK
    199? Trek 1420 ** 15% Off Hammer Nutrition Referral Code **

  23. #23
    Senior Member KungPaoSchwinn's Avatar
    Join Date
    Nov 2008
    Location
    Ms/Ca, USA,Earth.
    My Bikes
    2009 Trek FX 7.3 ( pimp moment )
    Posts
    705
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    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.
    2009 Trek FX 7.3

  24. #24
    Domestic Domestique UnsafeAlpine's Avatar
    Join Date
    Dec 2007
    Location
    Michigan
    My Bikes
    Brand New Old Catamount! Schwinn Homegrown, Specialized FSR, Salsa Vaya, Salsa Chile Con Crosso
    Posts
    1,736
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    These are the nicest for the money fenders I've run across. I've been really happy with mine.

  25. #25
    Senior Member Sci-Fi's Avatar
    Join Date
    Sep 2006
    Posts
    1,250
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by MrCjolsen View Post
    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.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •