Jure ,what weight do you think the frame will be when finished ?
Hard to say at this moment because I though it will weight more. I guess it should be very similar to PT4, although the tubes are stronger and also the reinforcements will have a few layers more. Around 950g would be great.
The chainstays weight also less than I expected, and they have even 2-3 layers (80g/m2) more...they came at 214g. The dropouts are 28g both (4.5mm thickness).
That's exactly 640 for the frame without the reinforcements and seatstays. I just laminated one seatstay today, probably it will weight around 70g for both + brake bridge.
If it will really turn out like that then I'll have cca. 720g frame without the reinforcements. And that's really light for me, because PT4 had only around 170g more after the reinforcements. Because better equipment I think that the reinforcements will weight the same although I'll add 2-3 layers more (because less exces resin compared to PT4).
So that would be a cca. 900g frame + cable stops etc.,..so 950g would be really great, and it will be stiffer than PT4. Actually I prefer to add stiffness and keep the same weight instead of loose more weight and then of course also some stiffness. After that project I'll again try to loose some weight and keep that stiffness etc.,..if you know what I mean.
PT4 rides a lot like the older models of Scott Cr1 and I would really like to add some stiffness, although it isn't bad at all. I think that I can be happy with a 950g custom tube-to-tube frame. I could also make it lighter, but of course with the sacrifice of stiffness, and I don't want that. But maybe I'll also make an "über light project" some day
. I really have great fun with those projects, it's a great feeling to make a frame like you want from the raw fiber to the finished product completely by yourself (I don't buy any tube for my frame - only the cable stops and the threads for bottle cages
It is really impressive to see how great the results of the tubes are, especially the top, down and seat tube.
I am in the midst of building my first carbon fibre frame, and I am far from acquiring such smooth finish...not to mention weights!
Really solid craftmanship, Berk
Nice to hear that, make sure that we'll be able to follow your progress
_________________Berk PROTO-TYPE Composites - Handmade In SloveniaBerk Compositeshttp://www.berk-composites.com/