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  1. #1
    mtbr member
    Join Date
    Sep 2011

    Avid BB7 disc size?

    I am planning to upgrade from the BB5 to BB7's. I'm not very happy with the performance of the 5's with 185mm rotors. Is there some kind of "rule of thumb" for choosing a rotor size? I am 185 lbs, do mostly XC with a little all mountain. I would say I am a novice rider but improving.

    I can get BB7's with 160mm rotors for $54, with 185mm rotors for $73, or with 203mm rotors for $61.

    My guess is that 160's are fine but I don't want to end up upgrading rotors in the future.

  2. #2
    Holy Land Rider.
    Join Date
    May 2008

    i am 105 Kg and ride 160mm rotors with no issue on both hydro brakes and BB7.
    i also ride XC and never encountered and brake fade on the BB7 or no enough bite.
    i use SD7 levers.

    my dial up is for less modulation and more of a snappy bite. of the BB7 and they do it just fine.

  3. #3
    mtbr member
    Reputation: Ronnie's Avatar
    Join Date
    Jan 2004
    You can use the BB7 with the same 185mm. rotor you are now using. I'd put a 185mm. on the front and a 160mm. on the back.
    The trouble with having an open mind is that people will insist on trying to put things in it.

  4. #4
    Bedwards Of The West
    Reputation: CommuterBoy's Avatar
    Join Date
    Oct 2007
    I have the 185's front and back on my 29er commuter. I like them a lot. I'm 215 pounds and always ride that bike with a full backpack. I commute all winter in snow, slush, etc...they have been awesome brakes. The 185 is not 'too much' brake for the back, for me.... I like having the same size rotors on both ends.
    You have no excuse for driving to work
    (unless you don't have studded tires)
    (no excuse for that either)

  5. #5
    Reputation: random walk's Avatar
    Join Date
    Jan 2010
    I've got 160mm on both F & R, and have no issues (205 lbs before gear). I would feel a little more comfortable with a 185 up front on the long, steep descents.

  6. #6
    Reputation: gregnash's Avatar
    Join Date
    Jul 2010
    190+ (have been as high as 205) and running 160 f+r. Love them and may eventually upgrade the front to a 185 but for now they stop me just fine.

  7. #7
    mtbr member
    Join Date
    Sep 2011
    Thanks guys. I think I will buy 160's since I have 185's. Then I can test 160, 185, and 185 front with 160 rear. Keep what works and sell what doesn't.

    Sent from my DROIDX using Tapatalk

  8. #8
    mtbr member
    Join Date
    Jan 2007
    I think you will get a lot of improvement just from the more solid caliper body and the improved adjustability of the BB7s. I run around 200 lbs, and don't have any issues with 160mm rotors w BB7s on my Karate Monkey.

  9. #9
    mtbr member
    Reputation: BORDERCOLLIE's Avatar
    Join Date
    Sep 2011
    I weigh 186 and ride moderately agressive, the 160's work fine for me.

  10. #10
    mtbr member
    Reputation: squareback's Avatar
    Join Date
    Sep 2011
    I use 203 on everything front and rear. I weigh 210, and ride aggressively. I also race cars and the parallel on cars is that the larger rotor gives a more immediate and predictable "bite". More predictable and consistent to your brain.

    This is the same on the bike. I also like the same size F-R, and a 203 rear is easier to skid if you need to.

    In terms of the weight difference for 2 rotors, it is 8 tablespoons of water. (or urine). Think about that.


  11. #11
    Huckin' trails
    Reputation: David C's Avatar
    Join Date
    May 2011
    I use 203mm everywhere, and I'm 110#.... I love disc brakes

    160mm looks silly, 185mm look good, and 203mm looks even better.... But I prefer 185mm rotor to 160mm, mostly for look, and also for better clearance of the braking zone and the hub, so less chance to touch the brake zone when cleaning the wheel...

    Quote Originally Posted by NicoleB28 View Post
    topless. that's what all mtb girls do. we go ride, get topless, have pillow fights in the woods, scissor, then ride home!

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