So the saga continues.
- I've had further contact with CarbonBikeKits. Now they say that the rims are correct, but that the spokes + nipples weigh 8g/spoke+nipple. So I've now asked them how this is possible when a 1420 spoke weighs 4,3g and an alloy spoke less than half a gram. They have offered a reufnd if I send the wheels back to China, but I'm assuming I'll still have to pay for shipping. Before I decide I want to understand what exactly went wrong.
My advice would be to just accept the wheels as is and move on. Shipping them back will be very costly, money you could put toward another set of lightweight wheels when you have the money. You went cheap and they turned out heavier than expected. At least it wasn't a pair of Dura carbon clinchers you bought (see other threads for that saga, or the Campagnolo wheel weight thread for that matter).
- I've been contacted by Workswell stating that the clearances are to tight for 28mm tires (which was one of the selling points of the frameset). They will try new prototypes and retesting, but can't give me even a rough estimate on when they will know more. So I have to decide what I will do about that.
- Workswell also informed me that the 165g seatpost I ordered will not go in production and that I will have to settle for a 200g one.
My Chinese regret-ometer is starting to rise to dangerous levels al this point. If anyone knows of a lightweight disc brake endurance frame, I might have to start considering alternatives (the budget is no higher than what I spent with Workswell).
My Hong Fu FM079-F at ~1400 grams for the frame and fork and all hardware minus headset will definitely clear 28mm tires but I am not certain if it fits your definition of 'endurance' geometry. I set mine up for a fairly low position but with a larger frame size and/or some spacers and different handlebars and stem, a far more upright position could be obtained. Budget-wise, the frameset was around $700 delivered, potentially too expensive for you. It came with a fairly heavy seatpost (225 grams) which I sold and replaced with a Ritchey Superlogic.