RK and first class are 100% the same seller, back when I bought my faulty frame he asked me to cancel my first class order and make it through the RK page to boost that store's ratings. Despite the apparent better quality from RK/FC/Polar, I wouldn't suggest anyone buy from them based on mine and other people's experiences here. It seems like their stores are maybe not even operating anymore? And I would just recommend avoiding that situation. I ordered my replacement frame from yoho and have been much happier with the frame overall despite the attention to detail on the accessories (bolts etc.) being not as good.

I ordered V2. Does anyone know if this would work instead of the supplied plug. I think it looks better than the top cap.

Ostro has a D shaped steerer, so no.

I have Leese cranks.

https://a.aliexpress.com/_EvzFpQU

Does anyone know how many spacers should I use between Bottom bracket and cranks?

If I remember properly, 1mm on the drive side. But in general, as many as it takes to get the preload right and the cranks centered on the frame.

Round 2... from Yoho this time. Hoping I was just unlucky last time and there are no issues here. Frame should be shipping soon.

Looks fine to me. The top tube and down tube of the genuine Ostro VAM are very thin and also flex when squeezed...

Update on my situation if anyone is interested:

I've been back and forth with the seller from RK Ultra (FC Carbon) in the last few days. I provided a lot of proof of the issue, including a report conducted by a bike shop outlining that the frame has a manufacturing issue and is unsafe to use. The seller initially offered me a 50% refund to keep the frame or a full refund upon receiving the returned frame. I told them that I will return the frame as long as they can guarantee me that they will cover the shipping costs, but they haven't been able to confirm this to me this clearly. I also offered to provide proof of destroying the frame to show that I'm not trying to get a second frame for free.

At this point, I am going to make a claim through AliExpress. As far as I'm concerned, my evidence is very strong that the frame has a manufacturing defect, even though the seller continues to state that the problem is solely that I'm dissatisfied with the product.

I'm disappointed to have received a frame with a problem, but I understand that even though this should have been caught, mistakes happen. I'm much more disappointed in their consistant denail, and insistance that the only issue is me being dissatisfied with the product. He said that they cannot confirm it is a manufacturing issue until they receive the frame.

I bought from them becasue the quality seemed to be the best on offer, but at this point I can't recommend anyone to go through either of these sellers. I will look at Yohobike for the next frame if the refund goes through because the quality seems to be good in the recent posts.

Vincent had the same problem in the TanTan topic: https://chinertown.com/index.php/topic,6275.90.html

after I told him to check the end-caps on the wheels and the UDH hanger, he got is solved. According to him, it was the UDH hanger..

This frame isn’t UDH, I did check the facing around the axles and the hanger and everything seems to be as it should. I can take a closer look but I don’t see anything that could make this big of a difference.