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CX 36/46 MEGAEXO to Compact 34/50

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  • November 9, 2013 at 3:31 pm #20180
    joebee9870

    Ive just got a Colnago World Cup and it comes with a FSA 36/46 Megaexo and I would like to change it to a Compact 34/50 but I could live with a 36/50 set up if that is possible. Do I just change the big ring to the 50 or the whole Chainset. Also Could the Megaexo BB be changed to a BB30 set up? Any advice would be great.

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  • November 10, 2013 at 12:22 am #762425
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    Jack Osbourne snr

    It was commuting that taught
    It was commuting that taught me how bad the Megaexo bearings are. Don’t plan on a lifespan of any more than a couple of months unless they never, ever see rain.

    By the way, check prices on complete chainsets before you buy rings for the current one. Frequently, the big Internet sellers knock out chainsets for less than a set of replacement rings.

    November 9, 2013 at 8:16 pm #762423
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    joebee9870

    I’m just using the bike for
    I’m just using the bike for commuting Jack but that sounds like good advice and not to expensive. Many thanks to you both.

    November 9, 2013 at 8:13 pm #762421
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    joebee9870

    Thank you Paul. I think that
    Thank you Paul. I think that is what I will do.

    November 9, 2013 at 8:11 pm #762419
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    Jack Osbourne snr

    Should be a 110 bcd chainset,
    Should be a 110 bcd chainset, so changing chainings is eminently possible. FSA rings usually have the bcd clearly marked on them, so simply check that before buying replacements. As Paul says, you’ll need to reseat the front mech upwards.

    Forget about bb30 on that frame though. It is possible, but pointless.

    HOWEVER… Whilst you’ve got the chainset off, take the Megaexo bottom bracket off and bin it. They truly are shockingly bad. Putting them on a CX bike is laughable as the seals seem to be made of bog roll.

    Take your pick of Hollowtech 2 bottom brackets as a replacement as almost any over a tenner will be miles better than the FSA.

    November 9, 2013 at 7:48 pm #762417
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    badback

    I think you should be just
    I think you should be just able to change the rings as long as you get one with the same bolt centres. Don’t for get to raise your front mech.

    Not sure on the BB as I have never had the pleasure of taking a Colnago to bits, but suspect you can’t as BB30 is a larger diameter to Megaexo and BB30’s are press fit as opposed to screw in. (It all depends on the bottom bracket shell).

    have fun,

    Paul

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