less expensive second bike for Winters in UK.
Plus i buy western brands and I also follow Chinese products closely as well, as but them.
I had a second bike Winspace SLC2.0 with hyper wheels but It was a little to small and I am bored so need a new project.
Tan Tan X68
XM Carbon speed Wheels 60f 65 & Carbon Crank
Ultegra Di2 Groupset

Sorry for the off-topic but may I ask which carbon crank you plan on using? Thanks in advance.

I did buy the cheapest chainrings on AliExpress right now. The zrace chainrings were like 17 dollar and I wanted to test if really my setup in general is the problem or the pass quest chainrings.  Weired thing was that the small chainring did not have enough space to clear the chainstay when used with the original Shimano crank.

But after fitting the zrace chainrings with my Magene powermeter it just works like a charm. Seems to even shift a tad better than Magene with Shimano chainrings.

Attached you can find a picture of the pass quest and the zrace chainring from the backside. My guess was that maybe those silver bits which guide the chain to the big ring when shifting up are missing or not pronounced enough on the pass quest chainring. But I am not entirely sure about that. I will order another set and try it again because they look so much better.

Must have missed that. Never knew that was in question. Been using a PassQuest Aero 50/34 + Magene PES P505 Base combo since almost a year now without any issues - on a BB86 that is.

T47 with some frames gives you issues though (nothing new either), that's why I was interested in which frame you are using. You conveniently still left this info out

I am sorry. I was trying it on a Airwolf YFR 066 and on my Rose Reveal 06 both with BB86. I am thinking about ordering a Tantan Frame with T47 soon. So maybe I am able to try it on another Frame.

Marking is facing the left crank arm side for the Pass Quest that I have.
This is the same side where the hole for the bolt has a chamfer.

Ok, thank you! This is how I thought the right direction would be. I ordered the ZRace Chainrings today and If I will get them to work, I will buy another pair of the Pass Quest Chain rings from the Link you've sent. Maybe it was some Kind of production defect, or I was sent a chainring which was not compatible for the 12 speed shimano groupset.

I am running the Magene PES P505 Base Power Meter with Pass Quest 48/35 chainrings on a 12-speed Shimano 105 di2 setup.
Works just fine...

Could you maybe sent a linkt to the chainrings you bought? Maybe I will buy another set and try it out. Because as I said I tried them on different bikes now with the Shimano Crank and Magene Crank, so I am pretty sure there must be something off with the chainrings I got.

Im not familiar with PQ 2x rings, does it has a chain ramp catcher?
when you shift the FD, does the chain even tried to get onto the catcher behind the big ring, or also didnt grab it at all? 

Luke@Teacevelo had one of his ring having that problem, where the catcher doesn't protrude out enough to catch the chain to ramp up (he did get it to shifting, but took extra revs)

I made a short Video which shows what exactly is happening. Weired Thing is that when I built up the Bike it was shifting up after a few rotations, but after riding it for a few miles there was no chance of it shifting up.


https://streamable.com/1rpwiw

This is interesting and concerning. I was planning to get the same combo, and I did not think this could even be a problem. How's that even possible? Does the FD not travel far enough to shift?

There are even photos of passquest + Magene P505 PES, that's why it's even more shocking.

Edit: What frame and BB is this?

It’s an Airwolf YFR 066 frame with a threaded ZTTO BB86 bottom bracket, but I don’t think this is the cause of the issue. I even tried fitting the Pass Quest chainrings on the Shimano crank, but it won’t shift up.

The first problem with the Magene and Pass Quest combination was that the adjustment range was insufficient, and the screw to adjust the Di2 derailleur was too short. To fix this, I made a 2mm thick plate that went under the front derailleur hanger. This allowed me to adjust it perfectly in the app, and I also tried fine-tuning it several times using the shifters. However, despite multiple adjustments, I still couldn’t get it to shift up.

Interestingly, the first time after installing the groupset, it somehow worked quite okay for a while. Since the derailleur is perfectly adjusted but still won’t shift, my guess is that the gap between the small and big chainring is somehow out of spec, or there is an issue with the tooth pattern on the chainring. With the Shimano chainring, it even shifts properly without being precisely adjusted.

@vladik005

Did you build it up with the Wide crank or the normal one to fit 40mm tires?

I am not sure whether 38mm tires will fit with the Ultegra DI2 or the SRAM Force Non Wide.

Pictures of the tire clearance would be appreciated. Thanks!