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  • Road questions
  • Taff
    Free Member

    About to buy a new road bike so been looking at the PX RT57. Couple of things that I’m not sure on.

    Firstly, will be running compact cranks (50/34)and a 11-28 cassette – I can use a mid length or short rear mech. Which one should I use? Presumably the short would be better suited.

    Secondly is crank length. Been advised to run with 172.5mm. I run 175mm on the mtb but been told with compact that 172.5mm will be better. Seen similar stuff on Google but have no idea why!

    Posted 11 years ago
    trail_rat
    Free Member

    crank length is nothing to do with the size of chainrings so who ever said that with a compact you are better with 172.5 is talking out their hoop for a start

    50/34 11-28 is a max difference of 33

    a road short has a 29 max on paper.

    thus the mid is the better fit. A road short will work IF you never cross gears …. on a compact you will cross

    Posted 11 years ago
    Taff
    Free Member

    Thanks trail rat.

    Posted 11 years ago
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