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Cannondale Headset K35028 lower bearing size?

skeetamskeetam Posts: 167
Does anyone know the lower bearing size of the Cannondale K35028 (11/8 x 1 ¼) headset?

It's from a Synapse Carbon Hi-Mod 2018. The upper bearing is fine but the lower is getting rough.

I just wanted to order one before I take it apart. I fear it will be a waterfall of steel balls when I remove the fork steerer.

Posts

  • Perhaps email Cannondale Spares and ask. They have always given me the correct sizing when I have had to replace bearings in the past. They should hold stock of what you after as well.

    https://cannondalespares.com/
  • skeetamskeetam Posts: 167

    Perhaps email Cannondale Spares and ask. They have always given me the correct sizing when I have had to replace bearings in the past. They should hold stock of what you after as well.

    https://cannondalespares.com/

    Thanks, I'll drop them an email and see what they come back with.
  • pastiepastie Posts: 38
    I’ve just replaced headset bearings on 2019 alloy synapse, pretty sure it’s same sizing - 1 1/4 45x45 degree. Upper is 1 1/8 45x45 degrees. Works fine, though the compression ring on upper can be a fiddle to get exact size.
  • skeetamskeetam Posts: 167
    edited 15 April
    pastie said:

    I’ve just replaced headset bearings on 2019 alloy synapse, pretty sure it’s same sizing - 1 1/4 45x45 degree. Upper is 1 1/8 45x45 degrees. Works fine, though the compression ring on upper can be a fiddle to get exact size.

    Thanks Pastie!

    Did a bit more digging around and for the sake of anyone else who has the same issue, here are the dimensions and FSA codes:

    Lower bearing
    FSA = MR082
    45° x 45° ACB Bearings
    Inner diameter = 34mm
    Outer diameter = 46.8mm
    Height = 7mm

    Bought here

    Upper bearing
    FSA = MR121
    45° x 45° ACB Bearings
    Inner diameter = 30.5mm
    Outer diameter = 41.8mm
    Height = 8mm
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