Frame sizing numpty question...

Droops
Droops Posts: 204
edited November 2010 in Workshop
sd

Comments

  • softlad
    softlad Posts: 3,513
    seriously..? 569mm - 556mm = 13mm
  • JohnnyAllez
    JohnnyAllez Posts: 785
    Get a 10mm shorter bar stem, might move the seat slightly forward, it`ll be there. Measure the distances etc from saddle tip to the clamp on the bar stem, to the hoods, watch the knee-over-pedal position, also drop from saddle top to bar top. Use spirit level to make sure everything is squared up when measuring each bike.

    I`ve got two Spesh bikes, one is 54, one is 56 frame sizes. I`ve got them set up with various different parts to make the contact points just about identical. Like I said, stem length, seat set-back or lay-back seatpost etc will give you quite a range of potential tuning. Also watch the bar width and where the hoods lie on the curves of the `bars.
    Jens says "Shut up legs !! "

    Specialized S-Works SaxoBank SL4 Tarmac Di2
  • Droops
    Droops Posts: 204
    Softlad - thanks for your response but is it as simple as your suggest? Note the different headtube angles, plus the seat tube of the 54 will be shorter which, in effect, lengthens the top tube for the same saddle hieght - I think :?
    But then again, maybe in real life it is nore-or-less simply 569 minus 556...
    Now I really am feeling like a numpty :oops:
  • softlad
    softlad Posts: 3,513
    the angles will give you the top tube measurement - but the effective top tube measurement itself is the only one worth considering...
  • John.T
    John.T Posts: 3,698
    The head angle will have very little affect on position, it is the seat angle which affects the position of the seat clamp. As these are the same putting your existing post / saddle straight on should be ok. You need to add a 5mm spacer under the stem. This will give a 13mm shorter version of your current position.
    My Fleet.

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