Front Mech - is 42T rating ok with a 48T chainring?

rfretwell
rfretwell Posts: 30
edited September 2013 in MTB workshop & tech
I'm building a hack bike on a shoestring budget.
There are plenty of 42T rated front-mechs for sale for next-to-nothing.
My big chainring is 48T so a 42T derailleur will sit a bit higher than optimum. Will this cause any problems?

Comments

  • Chunkers1980
    Chunkers1980 Posts: 8,035
    Are you looking at road mechs?
  • rfretwell
    rfretwell Posts: 30
    Whatever will work. I've removed the granny-ring from a triple so now it's 48/38. I thought I'd use the H/L screws to stop any up or down overshift.
  • The Rookie
    The Rookie Posts: 27,812
    rfretwell wrote:
    Will this cause any problems?
    Yes, shifting won't be good, you'll have to sit it far to high as the tail will catch much lower down than the top section due to th tighter curvature.
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.

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