I have a 2019 cannondale synapse. I would like to buy a new bits and pieces for it. One thing is a new top cap. The thomson one as that’s my surname. They come in black and silver and I will only buy the black one. I am stuck on what size I need and as I don’t know how to measure my current top hat size. Any help? On Evans cycles it says my headset bearing is 1 1/4 inch and standard top cap is 25mm. The thomson caps come in 1 1/2 and 1 1/8 inch. Any help would be great?
Thanks.
Thanks.