Hi Guys,

I love Cannondale's USA made frames and am looking to put together a custom XC race bike.

If I wanted to put a 110mm Lefty on a frame designed for a 80mm Headshok fork, would this alter the geometry? The answer seems obvious, of course, but I'm curious because of the design of the Lefty fork...Does anyone know the "effective" axel to crown height on a 110mm Lefty and the 80mm Headshok?

If I went with a Cannondale frame like the F1000/4000sl (designed for a Lefty), and I wanted to instead go with a Fox or Rockshox fork, which size would I use...100mm, 120...?

Is it possible to "correct" a 110mm Lefty to match the geometry of a 80mm Headshok (if I bought a non F1000/4000sl frame)? Specifically, I've seen people with 650b custom bikes clamp a 29'er Lefty's tube lower to bring the front end down.

Thanks in advance!

https://www.bike-eu.com/news/3363/cannondale-frame-production-outsourced.html
https://velonews.competitor.com/2009/04/news/cannondale-to-cut-pa-workforce_90139

Thanks, Bro. I knew that about two years ago. That's why I said that I'm into the US made Cannondales...As in not the Asian ones.

I did what you are talking about. I love my USA made bike and the lefty. I went from an 80mm Headshok to a 110mm Lefty. As for as the geometry, there will be very little change. I am not capiable of giving you a bunch of numbers and angles and waht not but I can tell you what I have experienced. For my bike, it only made it better with improved turning and feeling. I would not go back to the headshok after my experiences with the lefty. The headshok is a great fork but the lefty is just so much better.

I have some photos for you to see below of before and after.

Before:


After: