BB7 - 140mm necessary for rear?- Mtbr.com
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  1. #1
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    BB7 - 140mm necessary for rear?

    This is probably a dumb question but here it goes: Do I need to use a 140mm rotor for my rear brake with BB7s? I bought two sets of BB7 160mm brakes from Performance, and it says 160mm Front/Rear on the box, but on the calipers it says "160 F, 140 R". Why does it say 140 R, and if it does mean 140mm rear rotor, why would it come with a 160mm rotor in a box that says Front/Rear BB7?

  2. #2
    B A N N E D
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    calipers it says "160 F, 140 R"
    Don't you mean the adapter?

    No you don't need a 140mm rotor on the back, 160mm will be fine.

    The front adapter you have can be used for either a 160mm rotor on the front or a 140mm rotor on the back.

    *160mm front adapters are different to 160mm rear adapters.
    *Old BB7 kits came with either a front or rear specific adapter.
    *New BB7 kits come with both front and rear adapters.

    If you bought an old BB7 set and didn't specify that you wanted the brakes for both front and rear and they sent you 2 sets for the front then you'll need to either get a 160mm rear adapter to use the rotor you have or use the adapter you have and get a 140mm rotor for the rear. A 160mm rear adapter will be cheaper than a 140mm rotor.

  3. #3
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    Ah yes, I should have paid more attention.. It's on the adapter not the caliper. My bad for: 1. not reading instructions or checking more into it, 2. making a thread when I'm very tired

  4. #4
    C__Corax
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    to use a 140mm rotor on the rear you use a 160mm front adapter.

  5. #5
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    Yeah, I was just a little confused.

    There is a 160mm rear adapter included in the box to use with the 160mm rotor in the rear

  6. #6
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    Do you know if your BB7s are dual actuated? Meaning: both pads move
    Quote Originally Posted by anthonys
    Its still just the push of a button away...
    I am no longer a hardtailkid. 2012 Trek Remedy 9!

  7. #7
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    Quote Originally Posted by hardtailkid
    Do you know if your BB7s are dual actuated? Meaning: both pads move
    is that new?
    Honestly... ahh I give up

  8. #8
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    Quote Originally Posted by highdelll
    is that new?
    I dunno. I'm just asking. Some people say yes, some say no. Just tryin to find out...
    Quote Originally Posted by anthonys
    Its still just the push of a button away...
    I am no longer a hardtailkid. 2012 Trek Remedy 9!

  9. #9
    ~Disc~Golf~
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    Quote Originally Posted by hardtailkid
    I dunno. I'm just asking. Some people say yes, some say no. Just tryin to find out...
    it's either new or it doesn't exist
    I'm leaning toward the latter
    Honestly... ahh I give up

  10. #10
    What could go wrong ...
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    yeah on BB7s only the outer pad moves ... the inner, while it is adjustable, doesnt move
    I used to ride to Win ... Now I ride to Grin

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  11. #11
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    Pretty sure only one side moves.

    I'm installing the front brakes as we speak. Also on the agenda:

    - put new tubes and tires on
    - shorten chain
    - install bashguard (MRP XCG BB mount)
    - clean/lube everything

    I'd also be installing the rear brake but my new wheelset hasn't arrived in time and I have a big ride on Saturday.

  12. #12
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by hardtailkid
    Do you know if your BB7s are dual actuated? Meaning: both pads move
    The "dials", inner and outer, on the BB7 are for pad adjustment (static), so yes, both pads move. But the brake is not "dial actuated." When you pull the brake lever only the outer pad moves.

    With the BB5, there is only an inner pad adjustment knob. The outer pad is adjusted via the barrel adjuster. Like the BB7, only the outer pad moves for braking.
    mtbtires.com
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