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  1. #1
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    The definitive Avid BB7 weight thread...

    Frankly, I wasted too much time putting this together to let it get buried in the weight weenie forum. It deserves a thread of its own.

    So here you have my first attempt at a comprehensive answer to "How heavy are the Avid mechs?"

    Yeah, "heavy" as in "how much do they weigh?" Only you can be the judge of what constitutes "too heavy."

    For the record (if it's not already obvious), I'm a big fan of Avid's mechs, but I'm not necessarily trying to defend them as "light," nor "not heavy." They are what they are, and this is just an attempt to accurately portray that.

    I pulled the pads (new, 100%) to weigh separately, figuring the original "type F" caliper uses magnets and has no use for the spreader spring. The spreader spring weight doesn't register on my scale (<1g), so I didn't weigh it separately.

    I'm also asking for your contribution. See, I'm missing a few entries. I need a Clean Sweep 203mm rotor, as well as some Roundagon 160 & 165mm rotors. I also need Post Mount adapters for 185 and 203 rotor sizes (with the longer bolts). Anything else missing? If you can take sharp photos of them on a scale, send them my way and I'll add them to the worksheet.

    Oh, and if you've got any date corrections or a "type" for the new 2008 caliper, I'll take that, too.

    The flow of the worksheet is vertical, and hopefully pretty obvious.

    Last edited by Speedub.Nate; 12-14-2007 at 12:34 AM.
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  2. #2
    Nightriding rules SuperModerator
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    great work, Nate!

  3. #3
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    Quote Originally Posted by crisillo
    great work, Nate!
    Thanks! Too much work, if you ask me.

    Nothing I couldn't have (more easily) just typed into a table, without the pics.

    Luckily, only one of those rotors, calipers, and adapters was in service. But I had to pull levers off of two bikes. Boo hoo
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  4. #4
    Nightriding rules SuperModerator
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    Quote Originally Posted by Speedub.Nate
    Thanks! Too much work, if you ask me.

    Luckily, only one of those rotors, calipers, and adapters was in service. But I had to pull two levers off of bikes.
    Even bigger kudos then..

    I thought you just had collected the pics and weight over time....

  5. #5
    Meh.
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    Interesting... Though Avid claims the 2008 got lighter... it actually got heavier. Perhaps manufacturing tolerances?

    BTW, awesome post.

  6. #6
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    Quote Originally Posted by crisillo
    I thought you just had collected the pics and weight over time....
    Nope, that's how much crap great stuff I have sitting around. I haven't eBay'ed in over a year. I'm way past due.

    ...oops, check that -- the only parts outbound are the 203 rotors & adapters, and the Mag levers. Plus a ton of spare 160 IS mounts I could probably melt down and sell as scrap aluminum.
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  7. #7
    Nightriding rules SuperModerator
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    Quote Originally Posted by Speedub.Nate
    Nope, that's how much crap great stuff I have sitting around. I haven't eBay'ed in over a year. I'm way past due.

    ...oops, check that -- the only parts outbound are the 203 rotors & adapters, and the Mag levers. Plus a ton of spare 160 IS mounts I could probably melt down and sell as scrap aluminum.

    well.... if you have a 160mm rear avid adapter, that you want to let go, let me know... a buddy of mine has bb7s and uses a shimano adapter in the rear, so he is always shaving some material of the "handle" of the outside pad to be able to adjust it...

  8. #8
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    Quote Originally Posted by XSL_WiLL
    Interesting... Though Avid claims the 2008 got lighter... it actually got heavier. Perhaps manufacturing tolerances?
    Dunno. 13g is a lot of "tolerance" on a part at that weight -- about 8%. Did Avid make the "lighter weight" claim? I haven't compared their published weights.
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  9. #9
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    BTW, this all is a spin-off of this thread over in the Save Some Weight forum: Are BB7's heavy?
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  10. #10
    Meh.
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    Maybe the newer BB7 was produced on the heavier side and older one on the lighter side? I don't know. I do recall an article saying the new BB7 is supposed to be lighter. I guess you can't always believe what you read.

  11. #11
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    Quote Originally Posted by XSL_WiLL
    Maybe the newer BB7 was produced on the heavier side and older one on the lighter side? I don't know. I do recall an article saying the new BB7 is supposed to be lighter. I guess you can't always believe what you read.
    I dunno. I attempted a bunch of Google searches, including "Avid BB7 2008 lighter weight" and the only applicable hit was this thread!

    Avid doesn't seem to be claiming much of anything for this caliper (er, except "for fluid-o-phobes" and "...we gave the ('08) BB7 a .. new finish, inboard/outboard adjustment knobs and a beefy two-piece, forged body."

    Actually, I did email SRAM with a whole list of very specific questions a couple of months back, but they never bothered to respond to me. Waah!
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  12. #12
    Keep on Rockin...
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    Thanks...

    You just rained on my parade. And here all along I thought I was doing pretty good with about 450g per end.

    I was looking for an excuse to get a new set of hydraulics since the Mechs seem to freeze up in the winter.

  13. #13
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    Quote Originally Posted by Miker J
    You just rained on my parade. And here all along I thought I was doing pretty good with about 450g per end.
    Hey, if the desire to go hydro, plus a little "new math" are what you need to make the switch, by all means, do it. The only legit reason to stick with the Avids is because you want to run mechs and like the adjustments.

    Again, I'm just trying to provide some hard data.
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  14. #14
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    BB7 2008 weights

    The total weight of the bolts is about 42 grams (for 185mm IS mount and not including rotor bolts but including the two bolts that hold the two forged pieces together). So by replacing them all with titanium you are back to pre 2008 weight. They seem to have added more material on sections that will receive more loading..no doubt a CAD design and build.
    Attached Images Attached Images
    Last edited by lesoudeur; 12-25-2007 at 04:42 AM. Reason: add photo

  15. #15
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    Question. I'm building up a rigid bike on a budget and was thinking of swapping my wheels from my other bike back and forth insted of buying another wheelset. My main bike has Juicy 7s with 160mm rotors. Will the BB7s work with the hydro rotors?

    Thanks

  16. #16
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    Quote Originally Posted by Gary H
    Will the BB7s work with the hydro rotors?
    Absolutely.
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  17. #17
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    Quote Originally Posted by Speedub.Nate
    Absolutely.
    You Da Man! You just saved me alot of money and hassle!

  18. #18
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    Would an Avid Full Metal Jacket save some weight? They advertise it with " 35% lighter than equivalents section of cable housing". An Alligator Windcutter rotor (92g) could save 12g towards the 160mm Clean Sweep. Titanium bolts for the rotor would save 7g (for the six bolts).

  19. #19
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    Quote Originally Posted by trelgne
    Would an Avid Full Metal Jacket save some weight? They advertise it with " 35% lighter than equivalents section of cable housing". An Alligator Windcutter rotor (92g) could save 12g towards the 160mm Clean Sweep. Titanium bolts for the rotor would save 7g (for the six bolts).
    If that's true, then plan on 0.88g per foot instead of the 1.35g per foot I weighed.

    As for lighter rotors and bolts, those can be used to lighten up any brake, so in a relative weight comparison, it's nothing that gives the Avid Mech any advantage.
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  20. #20
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    I have Avid Mechs on all my bikes.

    How does a set of Avid Mechs (Caliper, levers, cable, housing, etc.) compare weight-wise to, let's say, XTR Hydros?? I'm really curious.

    Does hydraulic fluid weigh more or less than brake cable?

    Thanks in advance for your input.

  21. #21
    Linoleum Knife
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    What? No SD Ti's? FR's?

    Just kidding - nice. That's a whole lotta measuring.

  22. #22
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    I can contribute with some weights from my new Avid BB7 (2008)-Setup:

    - 1 Caliper + pads: 182g
    - CPS Hardware (1 break): 22g
    - Avid Roundagon 160mm rotor: 127g
    - 6 rotor bolts: 12g
    - 1 Avid Speed Dial SL: 78g
    - 160mm front adapter (if you have no postmount): 15g
    - Avid Full Metal Jacket (typical fullsuspension MTB setup front+rear with all parts): 130 - 140g

    So I get a total weight of 1022g for both breaks (only rear adapter needed). This is damn heavy! I will switch to 160mm Alligator Windcutter rotors, so I can save 70g and will end up with about 950g.

  23. #23
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    Quote Originally Posted by lesoudeur
    The total weight of the bolts is about 42 grams (for 185mm IS mount and not including rotor bolts but including the two bolts that hold the two forged pieces together). So by replacing them all with titanium you are back to pre 2008 weight. They seem to have added more material on sections that will receive more loading..no doubt a CAD design and build.

    Where are you guys getting the ti hardware from??
    Thanks!
    Clayton

  24. #24
    Ride Everything
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    I just installed some 2008 BB7s, and while they're a little heavier (sorry, I don't remember the exact difference), the knobs are a hell of a lot easier to use. The inner knobs are still a beyotch to adjust, but being able to use a torx on them makes life much easier. Spring tension seems stiffer, too.
    GRAVELBIKE.COM - ride everything

  25. #25
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    I have lubed the threaded of the inner knob to make it smoother.
    Is it normal for the BB7 that the break pads are somewhat difficult to take out? I need a claw to do this!

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