One of the van rysel guys mentioned that during an interview i saw on youtube. GCN one, from memory.
40/60 i think is T or M. So i think T40 is M40 or 40M. It's all quite confusing and few people really know the ins and outs of the topic, i think - and certainly not me. T in T800 is for Toray. I think the M is for Mitsubishi. But i think Mitsubishi is making Toray fibers. I understand 40T and 30T is similar to T800 and T700. But more expensive and better performance. So 60T is probably like T1000.
Anyhow, it's apparently what expensive frames are made of (the high end stuff, like Factor, Sworks, Pinarello). Giant, Merida, Cube, Orbea, all these, afaik, use lower grade stuff, probably very similar to what our OEM frames have.
Also, does any of this really matter, or is it a flex? idk. But it's probably the tricks pulled to shave the last 50 or 100g off a frame, and it's probably why you have a jump in price, because T700 & T800 is everywhere, but T/M40/60 isn't.
I think Toray and Mitsubishi still have a JV that owns a plant in Jalisco, MX, but for the most part, they are different companies and do not supply each other. Toray isn't exactly a large company, but it isn't small and sells a lot of other textiles and plastics. However, the M65 / M46 designation is a Toray one, and the grades of Mitsubishi fibers are different, and they don't map to the Toray products.
https://www.toraycma.com/wp-content/uploads/Carbon-Fiber-Selector-Guide.pdfThe basics of this is that within a specific price point, there is usually a tradeoff between tensile strength and modulus or strength and stiffness. And the prices go up relatively quickly as yields go down for higher grades of fibers. While mixing in different fibers undoubtedly raises costs, you can see in the spec sheet that using those different materials gives the designers greater freedom to make the bike stiffer in certain places vs. just using differing amounts of materials. I don't know how much of the difference in frame tuning is due to materials alone or simply a result of spending the time and expense to tune the frame. I like to see a mix of an intermediate (e.g., T800 or T100) and hi-mod fiber (e.g., M40J) because process and attention make a difference. It's not quite like this, but t800+m40j offers a slightly wider design space than even something like t800+t1100 in terms of stiffness, though the frame would be heavier.
Specific to the Winspace frames, I would guess that the 2nd gen 1550 is a step up from the 1st gen in terms of layup complexity, but the SL3 is yet another step up.