Advertise on Bikeforums.net



User Tag List

Results 1 to 16 of 16
  1. #1
    Senior Member
    Join Date
    May 2004
    Posts
    138
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Twin Disc Brakes

    I've seen on alot of motorbikes now they have a disc and caliper on both sides of the front wheel. Obviously for more braking power, but do any DH bikes use this yet? Might be a bit too powerful...

  2. #2
    mmm babaghanouj. rasheed's Avatar
    Join Date
    Aug 2003
    Location
    toronto, canada.
    My Bikes
    '02 gary fisher tassajara disc, '03 norco fluid 3.0
    Posts
    815
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    i'm not sure if anyone's riding them yet, but i remember seeing pictures of a bike with dual rotors on the front at one of the bikes shows - don't remember if it was interbike or eurobike or what...

    current ride: 2003 norco vps fluid 3.0 (custom build).



  3. #3
    The Man. FoX Rider's Avatar
    Join Date
    Jun 2004
    Location
    Sitting
    My Bikes
    Haro Extreme X3 with Hayes Mags and Evil DRS
    Posts
    1,070
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by JohnnyTheFox
    I've seen on alot of motorbikes now they have a disc and caliper on both sides of the front wheel. Obviously for more braking power, but do any DH bikes use this yet? Might be a bit too powerful...
    No, and I doubt they will even become very popular. A single 8" disc brake up front is more then enough braking power. Plus dual rotors and calipers ad's weight and no forks are set up for two calipers. Although they could be made, so would special hubs and it could get expensive.

    I have seen some pictures too but its overkill. IMO.

  4. #4
    I drink your MILKSHAKE Raiyn's Avatar
    Join Date
    Jul 2002
    Location
    St. Petersburg, FL
    My Bikes
    2003 Specialized Rockhopper FSR Comp, 1999 Specialized Hardrock Comp FS, 1971 Schwinn Varsity
    Posts
    15,071
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Could you imagine how skinny the hub would need to be to fit in conventional spaced forks? It would almost have to be a package deal - Fork, hub, dual caliper sytstem.

  5. #5
    Wood Licker Maelstrom's Avatar
    Join Date
    Apr 2002
    Location
    Whistler,BC
    My Bikes
    Transition Dirtbag, Kona Roast 2002 and specialized BMX
    Posts
    16,888
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Weight wouldn't allow it. They will continue with one thin rotor and just add extra pads/pistons. I couldn't imagine running a motorcycle rotor...would weigh as much as my fork.

  6. #6
    Hardtail WorldWind's Avatar
    Join Date
    Sep 2004
    Location
    Az. & Ca.
    My Bikes
    Richey Everest, Supercomp, Richey custom handbuilt Road, and others.
    Posts
    663
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    What is this obsessive compulsion with stopping? The whole point of DH is to GO fast. Not to see how fast you can stop.

  7. #7
    Wood Licker Maelstrom's Avatar
    Join Date
    Apr 2002
    Location
    Whistler,BC
    My Bikes
    Transition Dirtbag, Kona Roast 2002 and specialized BMX
    Posts
    16,888
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Good braking makes you faster, not slower. 6" in the front is inadequate for dh for almost any rider but the smoothest and lightest (I, personally, am neither smooth nor light) haha

  8. #8
    The Man. FoX Rider's Avatar
    Join Date
    Jun 2004
    Location
    Sitting
    My Bikes
    Haro Extreme X3 with Hayes Mags and Evil DRS
    Posts
    1,070
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by WorldWind
    What is this obsessive compulsion with stopping? The whole point of DH is to GO fast. Not to see how fast you can stop.
    You want brakes when theres a tree infront of you and your going 25+ MPH. Either good brakes or pray you can avoid it. I think the OCD thing about brakes in DH is modulation. Oh well.

  9. #9
    Fool O' crap sscyco's Avatar
    Join Date
    Jul 2002
    Location
    spokane
    My Bikes
    Specialized Tricross, Allez steel, Transition, 2009 Bighit 3, Lightspeed Owl Hollow and Kitsuma - and a couple others
    Posts
    1,217
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    A few years back Shimano made a dual disc set up that had both discs on the same side ( as a proto type only) - the claiper had 3 pads - the inner, the outer and one that slipped between the two rotors. This setup was tested in a few pro races. I remeber reading that a couple pros were spaying there rotors wit oil to reduce the power. Overkill.

  10. #10
    Senior Member
    Join Date
    Sep 2004
    Location
    Northern VA, USA
    My Bikes
    '98 Cannondale Super-v 700
    Posts
    68
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    One thing about twin rotors would be that they would get rid of the twisting force disc brakes put on the fork.

  11. #11
    i have a bike
    Guest
    no push bikes would use it

  12. #12
    Eschew Obfuscation! enduro's Avatar
    Join Date
    Oct 2004
    Location
    over here!
    My Bikes
    2005 Rocky Mountain ETSX, Surly Crosscheck, 2000 Enduro Expert (sold), 1999 Rockhopper, 1984 Trek 520 (STOLEN-but recovered!), $7 rigid MTB from a police auction (broken, then stolen)
    Posts
    591
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Balancing out the braking forces is definitely a good thing, but most DH forks should be sturdy enough to make the twisting very minimal. Also, such a design would allow for greater heat dissipation, meaning that you wouldn't have as many problems with fade and overheating the fluid. However, the same effect could be achieved by simply increasing the size of the rotor on a conventional system....oh wait...they've done that! Eight inch rotors (and maybe larger, as bikes get faster) give all of these benefits without the downside.

  13. #13
    Ride bike or bike ride? Hopper's Avatar
    Join Date
    Oct 2003
    Location
    Adelaide, Australia
    My Bikes
    MongoosePro DH, Dart custom road bike, .243 Racing FR street bike
    Posts
    1,447
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Isn't it ironic that you go faster with better brakes?
    Also, with a setup like that, would you need splitter setup on the hose, or cable?
    --------------------------------------------------------o__ ----
    ------------------------_-------_---|-\---------_---- _.>/ _ --------------
    _______________________| - \________(_)_\(_)_______\|/_______\|/______...

    Quote Originally Posted by Hilltop Hoods
    Aint it amazing how courageous human beings are?

  14. #14
    My life be like ooh aah anthonaut's Avatar
    Join Date
    Apr 2003
    Location
    Adelaide, Australia
    My Bikes
    Giant Boulder SE 2000, Craftworks FRM125 2002
    Posts
    1,409
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I know a guy and he's got a hub sitting at home with dual disc capabilities. Just a small problem though, no companies make forks with disc tabs on the right leg, let alone right side calipers.

    AND then as Hopper said, you'd need to get some kind of split system to get the working off the one brake lever.
    Any true downhiller can huck, but no hucker can truly downhill - Ryan N.

    Mtbworld - http://mtbworld.mybesthost.com

  15. #15
    Senior Member
    Join Date
    May 2004
    Posts
    138
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I guess for heat dissapation it would be good as for the same stopping power you would be using only half the power on each ?maybe?. One more thing to wrong tho, or many more things lol. Design for the sake of design really. Be interesting to try if you were made of money. ABS anyone?

  16. #16
    Eschew Obfuscation! enduro's Avatar
    Join Date
    Oct 2004
    Location
    over here!
    My Bikes
    2005 Rocky Mountain ETSX, Surly Crosscheck, 2000 Enduro Expert (sold), 1999 Rockhopper, 1984 Trek 520 (STOLEN-but recovered!), $7 rigid MTB from a police auction (broken, then stolen)
    Posts
    591
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Haha....ABS...I bet that would feel weird on a bike. Interesting idea though. You'd need a lot of extra hardware to make that work...including some kind of electric or vacuum source like on a car. I'm not so sure how you could make that work....
    I think with a bike you'd lose a lot of control if you had ABS...for instance you couldn't drift the rear tire around switchbacks.

Posting Permissions

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