Advertise on Bikeforums.net



User Tag List

Page 1 of 2 12 LastLast
Results 1 to 25 of 31
  1. #1
    I need speed AzTallRider's Avatar
    Join Date
    Sep 2009
    Location
    Phoenix, AZ
    My Bikes
    Giant Propel, Cervelo P2
    Posts
    5,487
    Mentioned
    8 Post(s)
    Tagged
    0 Thread(s)

    Oversized Bottom Brackets

    There is a trend, especially with CF racing frames, towards new BB standards like BB30, BB90, and BBright. This limits ones ability to swap parts around. For instance, having invested in a Quarq power meter that fits the threaded BB of my steel Gunnar, I find that my desire to be able to move the Quarq to a racing frame is limiting my N+1 choices. Of the bikes I'm currently considering, only one (Specialized Tarmac) is available with a threaded BB. There is a similar trend towards tapered head tubes. Both trends are based on eliminating flex, or at least making that flex elimination easier to accomplish.

    So my question, to those of you who have experienced both the old and the new technologies, is: How much difference does it make?

    Especially given I'm a big, 200 pound (well, actually 199.3 pounds now!) guy, should I bite the bullet and go with an oversized BB, reconfiguring my Quarq, or, (ga$p), buying another one?
    "If you're riding less than 18 MPH up a 2% grade please tell people Coggan is coaching you."

  2. #2
    Senior Member Allegheny Jet's Avatar
    Join Date
    Oct 2007
    Location
    Medina, OH
    My Bikes
    confidential infromation that I don't even share with my wife
    Posts
    5,625
    Mentioned
    11 Post(s)
    Tagged
    0 Thread(s)
    I like my Tarmac. I believe it is race worthy and I would buy it all over again.

    IMG_1275.jpg
    oldschool areodynamic brick

  3. #3
    I need speed AzTallRider's Avatar
    Join Date
    Sep 2009
    Location
    Phoenix, AZ
    My Bikes
    Giant Propel, Cervelo P2
    Posts
    5,487
    Mentioned
    8 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Allegheny Jet View Post
    I like my Tarmac. I believe it is race worthy and I would buy it all over again.
    And I take yours has a threaded BB, Jet? Tarmacs come in a variety of flavors, many of which use an Oversized BB.
    "If you're riding less than 18 MPH up a 2% grade please tell people Coggan is coaching you."

  4. #4
    Have bike, will travel Barrettscv's Avatar
    Join Date
    Feb 2006
    Location
    Windy City
    My Bikes
    A road bike for every purpose
    Posts
    9,015
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    There are adapters available for your existing Hollowtech or GXP crank.

  5. #5
    I need speed AzTallRider's Avatar
    Join Date
    Sep 2009
    Location
    Phoenix, AZ
    My Bikes
    Giant Propel, Cervelo P2
    Posts
    5,487
    Mentioned
    8 Post(s)
    Tagged
    0 Thread(s)
    I'm looking, and finding a lot of adapters, but so far nothing that is GXP <> BB90 (Trek Madone)
    "If you're riding less than 18 MPH up a 2% grade please tell people Coggan is coaching you."

  6. #6
    Have bike, will travel Barrettscv's Avatar
    Join Date
    Feb 2006
    Location
    Windy City
    My Bikes
    A road bike for every purpose
    Posts
    9,015
    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)
    Ahhh..., I would contact Trek.

  7. #7
    Council of the Elders billydonn's Avatar
    Join Date
    Jul 2008
    Location
    Omaha, NE
    My Bikes
    1990 Schwinn Crosscut, 5 Lemonds
    Posts
    3,761
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Allegheny Jet View Post
    I like my Tarmac. I believe it is race worthy and I would buy it all over again.

    IMG_1275.jpg
    ^^^^ Great looking bike!^^^^^

    There is a time to resign oneself
    to old age and infirmity. You first.
    My Cycling Blogspot

  8. #8
    Senior Member Allegheny Jet's Avatar
    Join Date
    Oct 2007
    Location
    Medina, OH
    My Bikes
    confidential infromation that I don't even share with my wife
    Posts
    5,625
    Mentioned
    11 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by AzTallRider View Post
    And I take yours has a threaded BB, Jet? Tarmacs come in a variety of flavors, many of which use an Oversized BB.
    It's an external threaded BB.
    oldschool areodynamic brick

  9. #9
    Senior Member Allegheny Jet's Avatar
    Join Date
    Oct 2007
    Location
    Medina, OH
    My Bikes
    confidential infromation that I don't even share with my wife
    Posts
    5,625
    Mentioned
    11 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by billydonn View Post
    ^^^^ Great looking bike!^^^^^
    thanks... makes me want to say "I'm Batman"
    oldschool areodynamic brick

  10. #10
    Senior Member Garilia's Avatar
    Join Date
    Sep 2010
    Location
    South Park...ing Lot
    My Bikes
    Fantom 29
    Posts
    554
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Man, I gotta learn the lingo. I thought Oversized Bottom Brackets was going to be a tribute to Queen's "Fat-Bottomed Girls."
    Aní though the rules of the road have been lodged
    Itís only peopleís games that you got to dodge ~ Bob Dylan

    2010 Motobecane Fantom 29
    2010 Jamis Quest

  11. #11
    I need speed AzTallRider's Avatar
    Join Date
    Sep 2009
    Location
    Phoenix, AZ
    My Bikes
    Giant Propel, Cervelo P2
    Posts
    5,487
    Mentioned
    8 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Allegheny Jet View Post
    thanks... makes me want to say "I'm Batman"
    Is that the bike that now has the PT?
    "If you're riding less than 18 MPH up a 2% grade please tell people Coggan is coaching you."

  12. #12
    Senior Member Allegheny Jet's Avatar
    Join Date
    Oct 2007
    Location
    Medina, OH
    My Bikes
    confidential infromation that I don't even share with my wife
    Posts
    5,625
    Mentioned
    11 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by AzTallRider View Post
    Is that the bike that now has the PT?
    The PT is in the hub of my training wheels that I can also use on my Roubaix and TT bike while training and in C races. Those 58cm tubular wheels are my Sunday-go-to-meeting wheels.
    oldschool areodynamic brick

  13. #13
    Senior Member Garilia's Avatar
    Join Date
    Sep 2010
    Location
    South Park...ing Lot
    My Bikes
    Fantom 29
    Posts
    554
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Wot's a PT?
    Aní though the rules of the road have been lodged
    Itís only peopleís games that you got to dodge ~ Bob Dylan

    2010 Motobecane Fantom 29
    2010 Jamis Quest

  14. #14
    Lula Mae = 15 lbs. bike_boy's Avatar
    Join Date
    Dec 2007
    Location
    I keep hitting <Escape>, but I'm still here!
    My Bikes
    2011 Trek Madone 6.5 w/SRAM Red
    Posts
    729
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    PT = Power Tap hub power meter
    My SO: Laugh now bike_boy, for tomorrow you will pay !!
    Me: Ah, 20 seconds of glory; a lifetime of pain !!


    Quote Originally Posted by DropDeadFred View Post
    nobody wins anything thinking they're going to lose! (except the lottery)

  15. #15
    Lula Mae = 15 lbs. bike_boy's Avatar
    Join Date
    Dec 2007
    Location
    I keep hitting <Escape>, but I'm still here!
    My Bikes
    2011 Trek Madone 6.5 w/SRAM Red
    Posts
    729
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I guess your saying you do not have an external threaded BB.
    Isn't a Quarq pm mounted in spider of crank?

    I have a 2011 Trek Madone w/BB90. I had my SRAM RED Compact Crank (BCD 110) from my old bike (which used a GXP external BB) re-installed to the Madone using required a BB90 BB kit. I chose the Enduro one with hybrid ceramic bearings.
    Last edited by bike_boy; 03-23-11 at 08:23 PM.
    My SO: Laugh now bike_boy, for tomorrow you will pay !!
    Me: Ah, 20 seconds of glory; a lifetime of pain !!


    Quote Originally Posted by DropDeadFred View Post
    nobody wins anything thinking they're going to lose! (except the lottery)

  16. #16
    Senior Member Garilia's Avatar
    Join Date
    Sep 2010
    Location
    South Park...ing Lot
    My Bikes
    Fantom 29
    Posts
    554
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by bike_boy View Post
    PT = Power Tap hub power meter
    thanks.

    So this connects to a cyclocomputer, and replaces the old magnet on the spoke kind of thing?
    Aní though the rules of the road have been lodged
    Itís only peopleís games that you got to dodge ~ Bob Dylan

    2010 Motobecane Fantom 29
    2010 Jamis Quest

  17. #17
    Senior Member Allegheny Jet's Avatar
    Join Date
    Oct 2007
    Location
    Medina, OH
    My Bikes
    confidential infromation that I don't even share with my wife
    Posts
    5,625
    Mentioned
    11 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Garilia View Post
    thanks.

    So this connects to a cyclocomputer, and replaces the old magnet on the spoke kind of thing?
    It is a sophisticated cycle computer that measures power generated by the rider in watts. The hub has strain gauges and other internal bits that measures torque, speed, distance, watts, time and estimates cadence and sends the info wireless onto the CPU. I purchased the cadence sensor to get real cadence. Instead of training by heart rate I train using established power zones that are similar to heart rate zones but are more accurate because power generated is consistent where HR can vary due to heat, fatigue and other factors. I had to do specific testing to determine the lactate threshold heart rate and average watts produced over a specific time frame to generate the data needed to establish the power training zones. It reads complicated, and to me it is, which is why I invest in a coach and spend my time riding and following directions.
    Last edited by Allegheny Jet; 03-23-11 at 09:10 PM.
    oldschool areodynamic brick

  18. #18
    your god hates me Bob Ross's Avatar
    Join Date
    Apr 2006
    Posts
    2,963
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    On the one hand, I gotta confess these oversized bottom brackets look pretty badass on a lot of new bikes...the sheer size of some of them conveys a solidity/rigidity that, in theory at least, suggests some sort of perfomance benefit.

    On the other hand, the puny normal-sized bottom bracket on my TIG-welded steel Strong frame is so freakin' solid I can't imagine anything else being perceptibly more rigid, or offering any perceptible performance gains.

    I know, "Failures Of Imagination Are Not Insights Into Necessity", yadda-yadda-yadda.

  19. #19
    Senior Member Allegheny Jet's Avatar
    Join Date
    Oct 2007
    Location
    Medina, OH
    My Bikes
    confidential infromation that I don't even share with my wife
    Posts
    5,625
    Mentioned
    11 Post(s)
    Tagged
    0 Thread(s)
    I understand where you are coming from Bob. In my case, with the wide and stiff bottom on my Tarmac I have never jumped on the pedals up a hill or sprint and had the chain rub the derailleur. Every effort seems to go into the wheels. My 1999 stiff aluminum Cannondale would rub quite heavily and my early-70's 531 steel Super Course would need constant trimming. If anything, it just feels good to have the bike respond to every effort the moment itís made.
    oldschool areodynamic brick

  20. #20
    Senior Member kr32's Avatar
    Join Date
    Sep 2008
    Location
    Waldorf Md.
    My Bikes
    Cannondale Six Carbon 5 and Gary Fisher Wahoo
    Posts
    2,045
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by billydonn View Post
    ^^^^ Great looking bike!^^^^^
    I'll second that!
    Very nice

  21. #21
    I need speed AzTallRider's Avatar
    Join Date
    Sep 2009
    Location
    Phoenix, AZ
    My Bikes
    Giant Propel, Cervelo P2
    Posts
    5,487
    Mentioned
    8 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by bike_boy View Post
    I guess your saying you do not have an external threaded BB.
    Isn't a Quarq pm mounted in spider of crank?
    I have an external threaded BB on the current bike, but might not on the new one. And yes, the Quarq unit is mounted in the spider.

    I have a 2011 Trek Madone w/BB90. I had my SRAM RED Compact Crank (BCD 110) from my old bike (which used a GXP external BB) re-installed to the Madone using required a BB90 BB kit. I chose the Enduro one with hybrid ceramic bearings.
    This is good to hear, as it is exactly what I'm considering. I have a SRAM RED S975 (S975=Quarq) GXP standard crank on my bike, and one of the bikes I'm considering is the Madone. I had heard of the Enduro adapters, as Cervelo also references them (for their BBright BB). I just haven't been able to find the right one online. I'm trying to make sure there are no surprises when I pull the N+1 trigger, and want to be knowledgeable before I even start talking to the LBS. I'm currently considering the Madone, the Tarmac, and Cervelo Rx, and I'm fortunate that we have an LBS carrying all three, and that LBS has a relationship (spelled d-i-s-c-o-u-n-t) with my coach.
    "If you're riding less than 18 MPH up a 2% grade please tell people Coggan is coaching you."

  22. #22
    I need speed AzTallRider's Avatar
    Join Date
    Sep 2009
    Location
    Phoenix, AZ
    My Bikes
    Giant Propel, Cervelo P2
    Posts
    5,487
    Mentioned
    8 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Allegheny Jet View Post
    It reads complicated, and to me it is, which is why I invest in a coach and spend my time riding and following directions.
    Me too. I'm trying to get my mind around the science and data, because that's just the kind of guy I am, but it truly is overwhelming. I've been gradually reading "Training and Racing with a Power Meter", which is the bible on the subject, digesting it slowly like a time-release protein powder. I'll finally be doing my threshold test a few weeks from now, when there is a break in my racing schedule.
    "If you're riding less than 18 MPH up a 2% grade please tell people Coggan is coaching you."

  23. #23
    Senior Member Garilia's Avatar
    Join Date
    Sep 2010
    Location
    South Park...ing Lot
    My Bikes
    Fantom 29
    Posts
    554
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I'm glad I don't race, just ride!
    Aní though the rules of the road have been lodged
    Itís only peopleís games that you got to dodge ~ Bob Dylan

    2010 Motobecane Fantom 29
    2010 Jamis Quest

  24. #24
    I need speed AzTallRider's Avatar
    Join Date
    Sep 2009
    Location
    Phoenix, AZ
    My Bikes
    Giant Propel, Cervelo P2
    Posts
    5,487
    Mentioned
    8 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Garilia View Post
    I'm glad I don't race, just ride!
    To quote a great old commercial: "Try it; you'll like it."
    "If you're riding less than 18 MPH up a 2% grade please tell people Coggan is coaching you."

  25. #25
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    633
    Mentioned
    31 Post(s)
    Tagged
    0 Thread(s)
    Seems [Afaik], BB30 moved the frame width out to re internalize the External bearing stuff.

    external stuff was compelled by Shimano, etc, jumping on the patent expiration
    of Bullseye, tube attached to the right crank arm design.

    the original design used needle and ball bearings , to fit in a normal 1.37" threaded shell..

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •