Hayes HFX 9 Rear Brake

rob allison
rob allison Posts: 27
edited September 2009 in MTB general
Hi all, just bought this brake but need a mount adaptor ( which I only just relised) however, i'm not sure if I need a 6 inch or 7 inch one?
I measured the diameter of my rotors and they come in at 6.5 inches.
Could anyone please make this easy for me!

Cheers
Rob
R.Allison

Comments

  • dave_hill
    dave_hill Posts: 3,877
    rob allison wrote:
    I measured the diameter of my rotors and they come in at 6.5 inches.

    Well in that case you definitely DON'T want the 6" adaptor....

    What discs are they?
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  • rob allison
    rob allison Posts: 27
    they came standard on my Giant xtc, I take it a 7 inch ould be preferable then?
    R.Allison
  • nicklouse
    nicklouse Posts: 50,675
    if you have measured it correctly you will need a rear 160mm adaptor and 2.5mm (X2) of spacers.
    Or a front 185mm adaptor.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
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  • Raymondavalon
    Raymondavalon Posts: 5,346
    Discs tend to be measured in Metric, and the common sizes are 160mm, 185mm and 203mm. I believe Magura have some bespoke disc size, but we'll ignore that.

    Traditionally the rear brake disc is a 160mm which equates to 6.29921 (6.3) inches
    If it's 185mm that would be 7.67717 (7.7) inches

    My money's on the 160mm
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  • nicklouse
    nicklouse Posts: 50,675
    Raymondavalon
    if the old brakes were the Giant copies of the old Hope C2 then i would be thinking 165mm

    as that was one of the old Hope standards.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • Raymondavalon
    Raymondavalon Posts: 5,346
    nicklouse wrote:
    Raymondavalon
    if the old brakes were the Giant copies of the old Hope C2 then i would be thinking 165mm

    as that was one of the old Hope standards.

    Ah, thanks Nick - I learn.. :wink:
    The Bouncer
    The Shaker
  • rob allison
    rob allison Posts: 27
    Thanks Guys for your help!
    R.Allison

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