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Measuring My Bikes Frame Size?

  • 09-04-2012 12:49PM
    #1
    derv
    Registered Users, Registered Users 2 Posts: 2,248 ✭✭✭


    I am quite new to cycling so please excuse the ignorance....

    I bought a 2nd hand bike at a good price from a friend to start me off, because I wanted to be sure cycling was for me before I splashed out.

    I do think the bike is too small for me, so was thinking about selling it and buying a bigger frame.

    However, I am a little unsure what frame size it is.
    At the time I did not put a whole lot of thought into the frame size. It felt ok.

    I need some advice on measuring the frame. Should I be:

    1) measuring the centre of the crank to the top of the seat tube
    2) measuring the centre of the crank to the centre of the top tube/seat tube
    3) something else?


    Thanks,


Comments

  • #2
    funnights74
    Registered Users, Registered Users 2 Posts: 1,952 ✭✭✭funnights74


    http://www.ebicycles.com/article/bicycle-frame-size-charts.html

    This link should help, if your friend is near enough the same height as you are , and he had the frame measured correctly then you should be close enough to the mark.
    There are a few variations, 2 guys the same height might have different leg lengths, posture and positioning on the bike also come into it.


  • #3
    macnab
    Registered Users, Registered Users 2 Posts: 1,505 ✭✭✭macnab


    Measure from the centre of the crank to the top of the seat tube, i.e. where the seat post is clamped.
    However the best indication of frame size IMO is from the centre of the head tube to the centre of the seat post, horizontal measurement.


  • #4
    derv
    Registered Users, Registered Users 2 Posts: 2,248 ✭✭✭derv


    thanks for the feedback,

    when i measure to the top of the seat post I am getting 18"

    i am 5"6.5' tall and my inner leg is 31"

    the online calculator suggest I need a 21" frame
    that's quite a big difference from what I have :-(


  • #5
    macnab
    Registered Users, Registered Users 2 Posts: 1,505 ✭✭✭macnab


    is it a road bike or a mountain bike or other, actually stick up the make and model to make things clearer as it might be a compact geometry frame.


  • #6
    derv
    Registered Users, Registered Users 2 Posts: 2,248 ✭✭✭derv


    sorry i should have said that it's a road bike.
    it's a lapierre 'francaise des jeux'

    exactly the same as this:
    https://us.v-cdn.net/6034073/uploads/attachments/106302/95780.JPG

    i need to correct what i said above, it is 19" to the top of the seat tube.


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  • #7
    macnab
    Registered Users, Registered Users 2 Posts: 1,505 ✭✭✭macnab


    I cant find any info on that model that is helpful. Can you measure the horizontal from the centre of the heat tube to the centre of the seat post, it should give a better indication.
    BTW you should probably be looking at a 52cm to a 53cm bike in a standard (not compact) roadbike frame.


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