Juanmoretime wrote:I'm a titanium fan so this thread peaked my interest. While I don't necessarily believe integrated headsets are the best choice they are not a bad choice either. How come such a long head tube? My Lynskey R320 is 280 grams lighter and by far the stiffest frame I have ever ridden. I looks like you need to cut some weight butting and shaping tubes if you really want to get into the weight weenie arena with titanium.
Its really a nice frame and I guess allot depends at what price point it will enter they market. It could be just so much more with some additional refinement. You did say its a prototype right!

Hey Juan,
thanks for your reply. I just came back from a short 30km ride up and down a hill to see how it handles climbing and descending. I'll write more about that soon.
I am really keen to hear your input since this is our design and yes, it is a test sample. Final production is awaiting my go-ahead so changes are indeed possible.
1. Head tube choice. Well, as detailed in the blog, purely engineering factors decided on the headset and the head tube design.
I have a standard titanium frame here that my friend is building into a bike - he did not know that we were developing the Millennium so he went ahead and bought this from another supplier. His frame uses the traditional external headset type. Using my digital calipers I measured the head tube at 38.11mm in diameter.
Our head tube, in contrast, is 42.5mm at its narrowest point and 44.8mm at the top and bottom where the top and down tube are welded on. Yes the head tube is hourglass shaped in fact - that is more visible in smaller size frames.
Since there are no miracles in engineering, the larger tube diameter feature also gives our head tube design an undeniable strength and stiffness advantage over a traditional external headset type head tube.
This is important since, as you rightly noted, the head tube in the size 58cm that I am testing is somewhat long. The Millennium is designed for epic riding, where riding just one century is a warm-up session. Thus we decided to go for a more sustainable body position. For short course and stage racing we have our carbon frames (
Isoflow,
Magnus,
Helios)
Incidentally, the Millennium head tube dimensions are identical to the Cervelo RS.
2. Frame weight. All the main tubes are double butted and extensively profiled. There isn't a single round, uniform profile tube on the entire frame - except for the BB shell. All the tube profiles (except for the seat tube, but ours is also profiled - oval at the BB) appear to be larger than the Lynskey 330 (I cannot find the R320 photos).
If you compare the BB photo of the Lynskey R330 - photo number 9 here:
Lynskey R330
...with an almost identical photo of the Velocite Millennium here:
Velocite Millennium BB area
...and use the 68mm BB width as the common frame of reference, it is possible to see the tube profiles and chainstay spacing (Millennium's are as wide as possible for maximum stiffness). Millennium tubes look to be somewhat larger.
Lynskey R330 is definitively about 250g lighter than the Millennium that weighs 1.53kg for the size 58cm, but the Millennium is a little bit lighter, or the same weight, if allowing for variance, as the Van Nicholas Astraeus and Van Nicolas Zephyr.
3. Price point. Oh, that is actually the really good bit.
Click here
4. Improvements. Please let me know what you think we can do to make it better, keeping in mind that this is a long distance, epic ride frame built to last a really, really, really long time.
I do not think that we can make it any lighter - the structural engineer in charge of making sure the frame can pass the EN testing refuses to budge, but we can consider anything else.
V.