Floating disc rotors - a new kid on the block

02gf74
02gf74 Posts: 1,171
edited June 2011 in MTB general
..... but what a crap design!!?!??!?! :evil:


we all know that straight lines are strongest and lightest so why the circular struts between the bolts?

Anyone know the wieght of the 160 mm version?

teppan_rotor_all.jpg

(click on photo for linky)

Comments

  • njee20
    njee20 Posts: 9,613
    I'll wager heavier and more expensive than KCNC ones.
  • ThePriory1978
    ThePriory1978 Posts: 563
    02GF74 wrote:
    we all know that straight lines are strongest and lightest so why the circular struts between the bolts?

    Because they look cool. Probably.
    Snot green Canyon Nerve AM 8.0x
  • nicklouse
    nicklouse Posts: 50,675
    ThePriory1978 wrote:
    02GF74 wrote:
    we all know that straight lines are strongest and lightest so why the circular struts between the bolts?

    Because they look cool. Probably.

    cheaper to make the casting on a lathe.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • stewlewis
    stewlewis Posts: 10
    02GF74 wrote:
    ..... but what a crap design!!?!??!?! :evil:

    we all know that straight lines are strongest and lightest so why the circular struts between the bolts?

    To counteract the twisting force when the brake is applied.
    Straight lines are strong if pulled against, spokes for instance.
    Braking force is twisting.
  • Bar Shaker
    Bar Shaker Posts: 2,313
    nicklouse wrote:
    ThePriory1978 wrote:
    02GF74 wrote:
    we all know that straight lines are strongest and lightest so why the circular struts between the bolts?

    Because they look cool. Probably.

    cheaper to make the casting on a lathe.

    They will be laser cut. You can have any pattern you want.

    Why you would want floating discs on a bike is beyond me. Unless you get them glowing orange hot, the only thing you will gain is a clunking sound over every bump and loads of attachment points to repeatedly and meticulously clean out.

    And they will be heavier.
    Boardman Elite SLR 9.2S
    Boardman FS Pro
  • Bar Shaker
    Bar Shaker Posts: 2,313
    nicklouse wrote:
    ThePriory1978 wrote:
    02GF74 wrote:
    we all know that straight lines are strongest and lightest so why the circular struts between the bolts?

    Because they look cool. Probably.

    cheaper to make the casting on a lathe.

    They will be laser cut. You can have any pattern you want.

    Why you would want floating discs on a bike is beyond me. Unless you get them glowing orange hot, the only thing you will gain is a clunking sound over every bump and loads of attachment points to repeatedly and meticulously clean out.

    And they will be heavier.
    Boardman Elite SLR 9.2S
    Boardman FS Pro
  • Bar Shaker
    Bar Shaker Posts: 2,313
    stewlewis wrote:
    02GF74 wrote:
    ..... but what a crap design!!?!??!?! :evil:

    we all know that straight lines are strongest and lightest so why the circular struts between the bolts?

    To counteract the twisting force when the brake is applied.
    Straight lines are strong if pulled against, spokes for instance.
    Braking force is twisting.

    If you pulled two fixing points apart from each other, the strip of metal between them would straighten. If you pushed them closer, it would bend away from the centre.

    If the strut between two points is curved, it is there for the sole purpose of looking pretty.
    Boardman Elite SLR 9.2S
    Boardman FS Pro
  • nicklouse
    nicklouse Posts: 50,675
    Bar Shaker wrote:
    nicklouse wrote:
    ThePriory1978 wrote:
    02GF74 wrote:
    we all know that straight lines are strongest and lightest so why the circular struts between the bolts?

    Because they look cool. Probably.

    cheaper to make the casting on a lathe.

    They will be laser cut. You can have any pattern you want.

    Laser cut alloy mmmm I would be surprised.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • rob.m
    rob.m Posts: 89
    Sheet metal worker here, you can laser cut alloy no problem.
    It's never too late to become what you might have been...........
  • supersonic
    supersonic Posts: 82,708
    Given equivalent dimensions though, a circle is torsionally stiffer than a square, or any other polygon.
    GT ZASKAR CARBON TEAM

    VOODOO CANZO

    Come and see me at https://www.facebook.com/biketyke/
  • Anonymous
    Anonymous Posts: 79,667
    I'll poly your gon in a minute.
  • nicklouse
    nicklouse Posts: 50,675
    Rob.M wrote:
    Sheet metal worker here, you can laser cut alloy no problem.

    not saying you can not. but then a nice finish and then anodizing?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • Northwind
    Northwind Posts: 14,675
    Will they still be just as heavy as full steel rotors, and no more effective, and a pain to use with some brakes? If so, I'm out
    Uncompromising extremist
  • weescott
    weescott Posts: 453
    Design over function. What's wrong with that? :lol:
  • joshtp
    joshtp Posts: 3,966
    Maybe a bad design... but dont right floating rotor's off for bikes... Hope use them to good effect.. and in the Alps a big guy can easily get a brake to fluid boiling temperatures.
    I like bikes and stuff
  • Anonymous
    Anonymous Posts: 79,667
    joshtp wrote:
    Maybe a bad design... but dont right floating rotor's off for bikes... Hope use them to good effect.. and in the Alps a big guy can easily get a brake to fluid boiling temperatures.
    Not just the alps :wink:
  • Northwind
    Northwind Posts: 14,675
    joshtp wrote:
    Maybe a bad design... but dont right floating rotor's off for bikes... Hope use them to good effect.. and in the Alps a big guy can easily get a brake to fluid boiling temperatures.

    I'm a pretty skinny guy but I've never had any bother with quality steel rotors and good brakes (despite being a massive brakedragger) But ymmv of course. But for most people most of the time they're just more expensive and less good I reckon.
    Uncompromising extremist
  • weescott
    weescott Posts: 453
    i'm a fan of floating rotors. They allow you to go up a disc size with roughly no weight penalty (in the case of Hope). More power is always good!
  • njee20
    njee20 Posts: 9,613
    There are lighter all steel rotors for far less money though.

    I trashed both of my Hope ones in one wet race. Admittedly the pads got incredibly worn, but I braked through the rivets, a normal rotor would've been fine.
  • Keith1983
    Keith1983 Posts: 575
    nicklouse wrote:
    ThePriory1978 wrote:
    02GF74 wrote:
    we all know that straight lines are strongest and lightest so why the circular struts between the bolts?

    Because they look cool. Probably.

    cheaper to make the casting on a lathe.


    How do you make a casting on a lathe?

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