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  1. #1
    Spelling Snob Hobartlemagne's Avatar
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    105 BB vs Pista Stock BB

    Ive been riding only my bianchi pista for the past 3 months, and yesterday got out
    the panasonic and noticed it rides a lot faster. The gearing is almost identical.

    Could my Shimano 105 BB in the panasonic allow less pedal rotational resistance than
    whatever is stock for the pista BB?

    The first rule of flats is You don't talk about flats!

  2. #2
    Senior Member tt1106's Avatar
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    Are there other differences? Frame weight? Tires, wheels...etc?
    I doubt if BB differences would make it noticeably faster unless there were problems. Are both sealed bearing units?

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    Are you still riding the stock wheels? I know on my Pista, the bearings in the stock Bianchi hubs spun like they were filled with glue. Not that good for meeting deadlines but works for resistance training.

  4. #4
    Spelling Snob Hobartlemagne's Avatar
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    Same tires on both, 20yr old 105 wheel and so-so mavic rear wheel on the pista.
    36spoke Vs on the panasonic. IRO rear hub, Shimano Deore front hub. The Panasonic is 1lb heavier too.

    Im just trying to identify some possible component advantage that I can reproduce if neccessary.

    The first rule of flats is You don't talk about flats!

  5. #5
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    unless you repacked the bearings with loctite bearing resistance is never going to result in a bike "riding a lot faster." The fact that the gearing is only almost identical outweighs it. The difference is probably in rider position or your head.

  6. #6
    Spelling Snob Hobartlemagne's Avatar
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    maybe I was excited to get my #1 bike back.

    The first rule of flats is You don't talk about flats!

  7. #7
    Senior Member mihlbach's Avatar
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    Quote Originally Posted by Hobartlemagne
    Ive been riding only my bianchi pista for the past 3 months, and yesterday got out
    the panasonic and noticed it rides a lot faster. The gearing is almost identical.

    Could my Shimano 105 BB in the panasonic allow less pedal rotational resistance than
    whatever is stock for the pista BB?
    Are you absolutely sure that one bike is really faster than the other? I seruously doubt it, unless one of them has a serious mechanical problem or maladjustment. Minor differences in BB, chain, or hub friction should not cause an overwhealming difference in speed. More likely one bike may feel a little faster due to differences in fit and handling. I have an old fixie conversion that weighs as much as a tank and I also have a much lighter, sleeker and more expensive track bike. They are both geared the same, but everytime I get on the junky conversion I could swear it is faster that my much sleeker track bike. But turns out to be an illusion. My cyclcomputers tell me that I am riding similar speeds on both, and actually tend to travel with a slighlty faster average speed on my track bike.

  8. #8
    jack of one or two trades Aeroplane's Avatar
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    Quote Originally Posted by dutret
    unless you repacked the bearings with loctite bearing resistance is never going to result in a bike "riding a lot faster." The fact that the gearing is only almost identical outweighs it. The difference is probably in rider position or your head.
    I concur. There was some breakdown of the resistance when riding a bike. Bearing friction was near 1%*, drag from the rider was about 60%*.

    * - completely pulling #'s out of my ass, but the point is the same. You save more energy by using your drops than by greasing your bearings.
    Quote Originally Posted by Dr Irwin Goldstein
    Men should never ride bicycles. Riding should be banned and outlawed. It is
    the most irrational form of exercise I could ever bring to discussion.

  9. #9
    Spelling Snob Hobartlemagne's Avatar
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    Quote Originally Posted by mihlbach
    Are you absolutely sure that one bike is really faster than the other? I seruously doubt it, unless one of them has a serious mechanical problem or maladjustment. Minor differences in BB, chain, or hub friction should not cause an overwhealming difference in speed. More likely one bike may feel a little faster due to differences in fit and handling. I have an old fixie conversion that weighs as much as a tank and I also have a much lighter, sleeker and more expensive track bike. They are both geared the same, but everytime I get on the junky conversion I could swear it is faster that my much sleeker track bike. But turns out to be an illusion. My cyclcomputers tell me that I am riding similar speeds on both, and actually tend to travel with a slighlty faster average speed on my track bike.
    Its not an illusion, My computer showed my total time as 1:07 for a hilly 16 mile ride. Ive never been able to do it faster than 1:30 before

    The first rule of flats is You don't talk about flats!

  10. #10
    Senior Member mihlbach's Avatar
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    HMM..maybe its a fit/setup issue. Is it possible that you are too dropped down on your Pista?...that would decrease you ability to sustain power when climbing hills.

  11. #11
    Cornucopia of Awesomeness baxtefer's Avatar
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    *nothing* is going to help you gain ~45 sec/mile
    except maybe a miscalibrated computer. Are you sure the difference is not in total elapsed time vs. time spent in motion?
    {o,o**
    |)__)
    -"-"-

    O RLY?

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