View attachment 3318 Thanx for the quick response. What you’ve described is actually the top bearing and what I need is the bottom one. The picture I’ve attached has the bearing you’ve identified sitting in the bottom cup and you’ll see it’s too small. What I need is approximately 60mm. The bottom bearing shoulder on the headshok body is obviously bigger as well, which you can see in my first picture. Any ideas please?
My apologies, I misread your post and didn't read the 60mm reference, nor did I see the difference in proportions to head cup size in your photo.
This "Type 1" Headshok fork went through variations during it's brief production run. The fork I have for reference I bought separately and I believe it was made during late '92/early '93 and would have been for the SuperV (curved fork legs painted black with silver splash and purple anodized head cups). Both bearings are the same size in inch. When you mentioned yours was a 1991, I assumed they were the same size! It was only after your post I remembered (vaguely), there was a switch, but can't remember if it was early in production, or late.
This is my love/hate relationship with Cannondale, I love their advanced technology, but they were constantly changing/upgrading their specifications and it's hard to keep track! In the near future, I'll post information and photos of the disassembly of my fork here on this forum, for future reference. It's been said these forks can't be serviced and I see what they mean. I'll figure out a way how to!
You have your required measurements to find the needed bearing; you have the ID of the machined recess in the head cup (for bearing OD), you have the OD of the shoulder of the steerer (for bearing ID) and you have the thickness by the depth of the recess in the head cup. With that, it should be able to be found.