You are correct. The VRO system is 25.4. The older Cannondale Headshok steer tube is slightly larger than 1.5"
NOS is about the only way to find a HeadShok stem with 31.8 handlebar diameter and the correct steer tube size. I found one on eBay.

 

So since mine is an old lefty, does it have the same diameter as a Headshok? so if I find a headshok stem (but doesn't say lefty)...it should work?

Also what degree rise do you think this is...from the handlebar to the steerer (not the stem angle)...

View attachment 1134685

 

Yes to the first question.

Are you asking what the handlebar rise is? Tough one, as with the adjustments you can do with the VRO, you might have to get out a straight edge and do some measuring.

 

you might have to get out a straight edge and do some measuring.

I was/did this, but quickly confused myself...should the straight edge be parallel to the floor or the head tube? I assume the floor but wasn't quite sure.

many thanks!

 

There's a 1.5" version of the VRO but it's shorter and, well, it's 1.5" not lefty...

 

I believe the rise is measured from the center of the bar where it clamps and then to the center of the end.

 

The tube size is 1.56, I have a brand new Cannondale 60mm 5deg stem that fits 31.8 bars I'm looking to get rid of since it's too short for my bike. I have $57.99 in it

 

Thanks all for the information. I found some NOS stuff on ebay for a few bucks and that worked out great!

 

A question. It has been argued by a Cannondale representative that the 1,5" and 1,56" standards are in fact compatible if the frame has a 4,5" headtube. As I happen to have an extra 1,5" stem which I bought by mistake, I was wondering if I could install a Lefty on a 2001 Jekyll using a 1,5" steerer. At the moment there´s an 1 1/8" straight Fox.

Or maybe I got this Definitive guide: Cannondale frame headset fork compatibility for mountain bikes and this http://forums.mtbr.com/cannondale/will-lefty-headshock-fit-1-5-headtube-102212.html wrong, in fact you need different headsets.

Big Question, If I have a frame that originally took a 1,56" stem and a QHDST, is it possible to install a 1,5 and a KP119 for Lefty?

I´m quite certain that it would be easier to follow the original idea.