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  1. #1
    Have bike, will travel Barrettscv's Avatar
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    Show us your bikes that fit well, and explain why.

    I can adjust the stem & saddle to provide a good fit if the horizontal top-tube is between 590mm and 620mm. I use the same pedal and the same pair of cycling boots for all bikes, the cleat was fitted by a pro based on video analysis. The relationship from the crank axis to the saddle always stays the same on all bikes and is the first adjustment I make when adjusting a bike. Adjusting the stem length and handlebars finished the fit. Seat-tube length and standover is not considered.

    This classic has a 64cm seat-tube and a 600mm top-tube. The tall headtube provides a comfortable reach with a 100mm stem.



    This cyclocross bike has a 58cm seat-tube length and a 590mm top-tube. The compact handlebars shorten the reach. The long fork and tall headtube provides a comfortable and sporty reach with a 110mm stem.



    This cyclocross bike has a 60cm seat-tube length and a 610mm top-tube. The long fork and very tall headtube provides an upright position and comfortable reach with a 110mm stem.



    This road bike has a 60cm seat-tube length and a 590mm top-tube. The compact handlebars shorten the reach. The bike provides comfortable and aerodynamic fit with a 110mm stem. The aero-bars improve aerodynamics while giving the hands a rest. They are only used while riding solo.




    This classic has a 63cm seat-tube and a 590mm top-tube. The tall headtube provides a comfortable and sporty reach with a 120mm stem.
    Last edited by Barrettscv; 07-06-13 at 12:43 PM.
    2014 Trek DS.1: "Viaggiatore" A do-it-all bike that is waiting in Italy
    2012 Pedal Force CG2: "Secolo Bicicletta" the modern carbon fiber road bike
    2012 Pedal Force CX2: "Carbone CX" the carbon fiber CX bike
    2010 Origin 8 CX 700: "Servizio Grave" Monstercross/29er bike
    1997 Simoncini Special Cyclocross: "Little Simon" lugged Columbus steel CX bike
    1987 Serotta Nova Special X: "Azzurri" The retro Columbus SPX steel road bike

  2. #2
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    225.jpgMy old Dakar had a 610mm top tube, I ran a 120mm stem; bar is always in the range from saddle-level to 1" below, 'KOPS' adjustment 10mm or so behind the spindle, and saddle height (measured from pedal at lowest to top of saddle) is .96 meter. The position on this bike was a touch more upright than I liked, but it was good enough.
    Photo-0103.jpgThe Kona has a 625mm top tube, 110mm stem; other adjustments identical. The position is as near to perfect as I can ask for. (NOTE: bar/stem have been changed from this pic)

    I don't have a fleet of bikes; I'd rather put all my 'bike love' into one good-as-it-gets-for-me machine.

  3. #3
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    Quote Originally Posted by Barrettscv View Post
    Seat-tube length and standover is not considered.
    Hi,

    Though for several bikes that all fit you the seat-tube length
    is directly related to the standover clearance, and the typical
    recommended 6 or 7 inches of seatpost should yield the right
    sort of standover height for most people.

    For most people a bike you cannot standover is unlikely to fit.
    Should only be an issue with short legs and a long torso.
    Conversely long legs and a short torso should have
    loads of standover clearance and a long seatpost.

    rgds, sreten.
    Last edited by sreten; 07-06-13 at 01:12 PM.

  4. #4
    Have bike, will travel Barrettscv's Avatar
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    Quote Originally Posted by sreten View Post
    Hi,

    Though for several bikes that all fit you the sear-tube length
    is directly related to the standover clearance, and the typical
    recommended 6 or 7 inches of seatpost should yield the right
    sort of standover height for most people.

    For most people a bike you cannot standover is unlikely to fit.
    Should only be an issue with short legs and a long torso.
    Conversely long legs and a short torso should have
    loads of standover clearance and a long seatpost.

    rgds, sreten.
    The idea of this thread to to explain why a certain bike fits a certain person. This is about the application of theory, using concrete examples.

    For me, I rarely see a bike that would cause standover issues. Most manufacturers don't even make a standard frame with a standover greater than 34 inches. At 6 feet, standover height is not a real issue.

    Can you provide a bike-fit example?
    Last edited by Barrettscv; 07-06-13 at 02:01 PM.
    2014 Trek DS.1: "Viaggiatore" A do-it-all bike that is waiting in Italy
    2012 Pedal Force CG2: "Secolo Bicicletta" the modern carbon fiber road bike
    2012 Pedal Force CX2: "Carbone CX" the carbon fiber CX bike
    2010 Origin 8 CX 700: "Servizio Grave" Monstercross/29er bike
    1997 Simoncini Special Cyclocross: "Little Simon" lugged Columbus steel CX bike
    1987 Serotta Nova Special X: "Azzurri" The retro Columbus SPX steel road bike

  5. #5
    Senior Member bikemig's Avatar
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    I can pretty much always fit a bike that has a 56 cm top tube with a 12 stem or thereabouts. I was in a bike store recently and I really wanted to fit a 54 cm Surly LHT because it was green and at a good price since it was an older model. Try as I could I couldn't quite dial in the fit. Yes I could put in a longer stem but then my weight was farther forward than I liked. The one thing I should have tried but didn't was to try a saddle with really long seat rails like a selle anatomica but it's a drag having limited choices on saddles. My point is that it takes time to dial in the fit and that the importance of top tube length is underrated when it comes to bike fit. I also think Greg Lemond's Complete Book of Cycling is very good on fitting a bike. Racers know something about bike fit.

    Here are two bikes that are set up and fit me nicely (this thread is an excuse for more bike porn, right?

    My Soma cross is set up with a triple and 700 by 38c tires; it is a compact geometry that gives me a 56 cm top tube. My Bridgestone RB-1 is a 56 square which fits me well:

    P1010081.jpgSoma2.jpg

  6. #6
    Ding! Bandera's Avatar
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    Quote Originally Posted by bikemig View Post
    Greg Lemond's Complete Book of Cycling is very good on fitting a bike. Racers know something about bike fit.
    Indeed, here's an old school fit that works perfectly well today.

    1992 Vitus 979, 56 CT/56 TT w/ 12cm stem, 40cm bars & 172.5 cranks. Road raced in the day, saw lots of club miles.
    At 5'10" it gives the relaxed elbows bent position for efficient control and good power delivery.
    Recently converted to 10 speed components seatpost/saddle, bar, stem & crank positions re-lubed & returned to exact original positions.

    -Bandera
    Attached Images Attached Images
    '74 Raleigh International - '77 Trek TX900FG - '92 Vitus 979 - '10 Merckx EMX-3- '11 Soma Stanyan

  7. #7
    Have bike, will travel Barrettscv's Avatar
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    Quote Originally Posted by bikemig View Post

    Here are two bikes that are set up and fit me nicely (this thread is an excuse for more bike porn, right?

    My Soma cross is set up with a triple and 700 by 38c tires; it is a compact geometry that gives me a 56 cm top tube. My Bridgestone RB-1 is a 56 square which fits me well:

    P1010081.jpgSoma2.jpg
    Nice bikes, and yes, bike porn with an informed bike-fit narrative, like yours, is the format :-)

    Quote Originally Posted by Bandera View Post
    Indeed, here's an old school fit that works perfectly well today.

    1992 Vitus 979, 56 CT/56 TT w/ 12cm stem, 40cm bars & 172.5 cranks. Road raced in the day, saw lots of club miles.
    At 5'10" it gives the relaxed elbows bent position for efficient control and good power delivery.
    Recently converted to 10 speed components seatpost/saddle, bar, stem & crank positions re-lubed & returned to exact original positions.

    -Bandera
    Nice bike and comments concerning fit!
    Last edited by Barrettscv; 07-06-13 at 09:59 AM.
    2014 Trek DS.1: "Viaggiatore" A do-it-all bike that is waiting in Italy
    2012 Pedal Force CG2: "Secolo Bicicletta" the modern carbon fiber road bike
    2012 Pedal Force CX2: "Carbone CX" the carbon fiber CX bike
    2010 Origin 8 CX 700: "Servizio Grave" Monstercross/29er bike
    1997 Simoncini Special Cyclocross: "Little Simon" lugged Columbus steel CX bike
    1987 Serotta Nova Special X: "Azzurri" The retro Columbus SPX steel road bike

  8. #8
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    Quote Originally Posted by Barrettscv View Post
    The idea of this thread to to explain why a certain bike fits a certain person. This is about the application of theory, using concrete examples.

    For me, I rarely see a bike that would cause standover issues. Most manufacturers don't even make a standard frame with a standover greater than 34 inches. At 6 feet, standover height is not an real issue.

    Can you provide a bike-fit example?
    Hi,

    My bike has a compact style frame with a sloping up top tube.

    I'm 5'8" and a 32" inseam in the footwear I use for biking.
    Clothing inseam is 29". I'm also 50+, slim for my age.
    (Average weight for my height, lower recently.)

    Have been riding it since Easter.

    My budget bike claimed to be sized for 5'6" to 5'10".

    Standover is ~ 1" (a little more) as usually recommended.

    New saddle is set to the 0 position marker on the rail.

    Saddle height is set using a straight leg and instep on the pedal.

    Seat tube to the rails is 6", 8" to the lower sloping downtube.

    Front tube is a substantial 7", but the bullhorn bars are
    now set to the lowest position on the threadless headset.
    They are ~ 3" below the seat. Bars are tilted down a little.
    (Started off set highest, with the stem flipped up.)

    On the bike on the back of the saddle the bars obscure
    the front spindle, normally I can see the front spindle
    a little ahead of the bars, theory says I need a longer
    stem, but I don't think so yet, as I don't use the
    longest reach of the bullhorns much as yet.
    (Starting to ease into using that hand position.)

    Elbow on the front of the (11") saddle and the tip
    of my fingers to the bars centre is about 3", very
    ballpark for a very old school sizing method.

    rgds, sreten.

    Crank centre to seat top is 29" *, front tube centre to
    seat tube centre horizontally 21.5", stem centre to
    centre 3.5", bars centre to front wheel axle centre
    is 23", the effective frame size I estimate as 22".

    But the last figure take with a pinch of salt, front to
    back matters more and its a compact geometry bike.

    * I would never have thought it was that much,
    the same as my clothing inside leg, so I checked
    my folder, and that is set to 28.5". I think I've
    discovered another bike sizing "rule of thumb".
    Last edited by sreten; 07-06-13 at 06:05 PM.

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