Cannondale Headset K35028 lower bearing size?

skeetam

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.

MidlandsGrimpeur2

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/

skeetam

MidlandsGrimpeur2 said:

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.

pastie

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.

skeetam

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