To the Ostro owners, what size tire and wheel (IW/EW) are you using?  How is the tire clearance with this frame?  I assume it will take up to a 32mm tire, but I haven't seen this in the specs.

Thanks

Cool, same as me, most of the things you planned to do I also have on my list.
The Overfast Thru Axles however I couldn't get my head around to spend 200 bucks for a weight saving of 34 gram, not sure how you get to shave off 60 to 80 grams there. My axles that came with the frame are together 64 grams and the overfast axles are together 30 grams. The titanium axles are also around the 240 dollar price point but a little heavier (40grams). What I did was checking for myself, what I think, what is still affordable grams to price ratio. So, in the end I bought the alu axles with dropout, which reduces it with 16 gram (from 64 grams to 48 grams) but costs (50 dollars) 1/4 of the carbon or titanium axles. But it's of course much cooler, lighter and nicer to have carbon or titanium ones.

Not sure what Crankset you have now but the Riro is light indeed (388 grams), I had on my list the Cybrei carbon Crank, which weights 320 grams instead of my Lexon carbon crank which is 387 grams (weighed myself including spider and bolts). but for the price of a Cybrei to save 55 grams, for 500 dollars.. I don't know you need to be really ambitious as you said, if will will be that kind of weight weenie.

Wheelset will definitely help, I also had those farsports in mind together with the No. 5's also worth looking at, and I think to logo of No. 5 looks cool with the Factor Logo IMO, it would be awesome if you could sell your Rovals than you don't lose a lot on the costs to replace those wheels.

For the disc brakes, I have now the Carbon Raceworks, but they were with 6 bolts because I read that was lighter than a center lock, however I bought the elite drive wheels and selected the 6 bolts option but instead of getting six bolt version I got an adapter for the 6 bolts that fit the center lock. So the "light" carbon raceworks are together with the adapter not so light anymore, and if I get some Galfer road wave discs of 160 mm that weigh the same as the raceworks I can replace the adapter just for the centerlock, which saves me 45 grams.

The last thing that I want to mention as you pointed out the Darima seatpost, I bought a replacement seatpost on AliExpress (https://nl.aliexpress.com/item/1005006226516164.html?spm=a2g0o.order_list.order_list_main.4.6dc379d2tMfyz5&gatewayAdapt=glo2nld which is 89 grams lighter (claimed weight 131 grams incl bolts) than the original (weighted at 220 including bolts) and costs less than a Darima (duh because it's from AliE). Maybe worth looking at.

Saddle is every rider's preference so I won't say anything about that. I got a Ryet carbon saddle width of 135mm, but that's so personal mine weighs in at 115 grams. The previous one was 163 grams.

Most bolts that I could chance with titanium didn't save me a lot, around 17 grams.

I hope it's helpful and let us know how much weight you saved in the end. With the mentioned changes above I saved +/- 400 grams (went from 7460 grams to 7050 grams) but with other tires and wheels that's around another 400 to 500 grams.

Well from 1st hand experience alone, and this is not meant to be an exhaustive list, but I've never had problems with Far Sports, Peter (Xiamen Carbon Speed), and Long Teng. I think Chris from Velobuild is also doing a pretty good job given I suspect they track everything by hand with an excel if not a notebook (given their scale they could use an ERP). I wouldn't buy a frame from Airwolf but i'm very happy with their cockpits (allegedly T1000), which you can find on Aliexpres (on that, a friend just broke one, but he crashed at high speed because of a cat (i love that story, i dont like cats), so i dont think that means they're bad, just that well, if you crash, you can break stuff - earlier in the year he crashed in a descent and broke his front wheel).

If you can avoid it, dont buy stuff from Racework. I have mixed feelings about Winow. And definitely, definitely don't give your money to First-Class Carbon Fiber Store...

Compression plug doesn't hold any stress while riding. Your handlebar is clamped to the steerer and keeps everything together. Compression plug and top cap function only to set correct tightness for headset.

hey OP would you mind sharing the taobao link/shop name?