I'm looking into getting a new headset for my prophet mx with 1 1/8" steerer forks, but a little unsure what to get..
Now as standard on the prophet, I 'think' there is a 1.5" - 1 1/8" reducer cup/adaptor that is pressed into the bottom of the headtube, then a standard 1 1/8" lower headset fitted into this? And the upper headset is a 1.5" - 1 1/8" reducer that goes straight into the headtube?
If so can I remove this lot (including the lower reducing cup/adaptor) and fit something like a hope 1.5" - 1 1/8" reducer headset? But this may mean that the 'u turn' adujster or compression adjuster of the pikes may hit the downtube, anyone running this combo?
Any help/info greatly appreciated 
