11 speed ration dilemma

siddy1972
siddy1972 Posts: 180
edited November 2015 in Road general
I'm converting to 11 speed- currently running a 36/50 with 12-27 10 speed which is spot on for me. Shimano don't do any similar sizes in ultegra (dura ace cassettes are too pricey). My question is, if I run a 50/34 with 12-25 will the bottom end be about the same as my current setup or am I going to be overgeared trying to get up the hills around here?
Thanks for any feedback.

Comments

  • pblakeney
    pblakeney Posts: 27,347
    Old gear ratio = 1.33.
    New gear ratio = 1.36.
    So ever so slightly harder. 0.2 mph faster at 90 rpm.
    Try the free Bike Gear Calculator app.
    The above may be fact, or fiction, I may be serious, I may be jesting.
    I am not sure. You have no chance.
    Veronese68 wrote:
    PB is the most sensible person on here.
  • siddy1972
    siddy1972 Posts: 180
    Thanks for that- hard to tell from numbers- probably won't notice do you think?
  • foggymike
    foggymike Posts: 862
    Why not just get the 11-28?
  • siddy1972
    siddy1972 Posts: 180
    It's missing the 16 tooth, which is right in my sweet spot, plus I barely use the 11, never on the flat, so it's a waste of metal for me- wish they did a 12-27 like the Edco one (without the astronomical price).
  • londoncommuter
    londoncommuter Posts: 1,550
    This is a really nice tool for visualising the differences:

    http://www.ritzelrechner.de/#

    I agree with Siddy about the 11. I've just got a 52/36 chainset so can live without the 11 but SRAM also don't seem to give that option. 12-26T would be perfect.

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