I recently acquired a Cannondale Prophet frame which I’m planning to slowly build up over winter. Having just received a set of tapered forks for it, I’m a little baffled as to what headset I need to use.

Any ideas folks?

You can use the Hope ones:

1 x Hope Pick ‘N’ Mix Headset Cups (4) Top – 1.5″ – 1 1/8″ Step Down Traditional (49.57 dia)

1 x Hope Pick ‘N’ Mix Headset Cups (F) Bottom – 1.5″ Traditional (49.57 dia)

How deep is that bottom cup?

Ideally the Prophet needs a deep bottom cup when not running a Lefty.

I have a prophet with a tapered fork and use a superstar headset.
I think it is this one http://superstar.tibolts.co.uk/product_info.php?cPath=25&products_id=426
The lower bearing lasted about a year before getting really gritty but then you can buy a new one for £7ish.

Hmmm, i’ve just checked the bottom cup installed at the moment (1 1/8″) and it’s a whopping 18mm deep!

The Superstar one claims to have a 12mm bottom cup but is OOS anyway.

Thanks for the replies so far. Anyone else with any experience of this?

The Hope one is deep enough depending on your forks.

I can’t remember but I think you can reuse the existing cup with the right bearing. There are loads of threads on here if you have a search.