Have gone through the long journey to install a Roadlink DM on my 2023 Cervelo Aspero. But something's still not right. Welcome any second guessing here. Maybe it's the small details.

Here's the overview:

• 2023 GRX 810 Cervelo Aspero (2x)
• Swapped out the 810 48/31 crankset for a 46/30 GRX 10 Crankset because I needed 165mm crank arm length (per my bike fitter)
• Swapped out the 11-34 cassette with an 11-40 because I wanted a better granny gear
• Internet research suggested that Roadlink would help with fitting an 11-40 cassette
• WTB support told me in so many words that the Roadlink DM is best for the GRX 810
• This is pretty much a brand new bike it sat around for a year in my garage before I got to it
• Replaced the cranks, routed new cables for good measure, mounted the Roadlink DM and the new cassette (had to add a 1.85mm cassette spacer to eliminate the wobble)

Where I'm at now / what's not right

• Took me a LOOOONG time to get the 810 FD dialed in - think I'm finally there.
• Took it out for a couple short rides - everything seemed OK
• Did a longer 68 mile ride - noticed some chatter / chain noise in the rear cassette when I was in the three smallest cogs and the large chainring
• So my mileage on this setup is about 100 miles right now
• Everything else is working really well, especially small chainring and largest cogs

Questions

• What could be causing the chatter?
  • New cables stretching out and just need more adjustment?
  • Bent derailleur hanger? (Would a Roadlink be making things any worse)?
  • Just need to adjust the RD limit screws and indexing on the RD some more?
    
    
  • 
    

1... cables and housing seat in after a bit of use.
i pre-seat them by tugging on an open section of cable... it seems to help immensely.

2... if you haven't checked the hanger trueness, do it, as a matter of "just because". and yep, you've added another pivot point, so getting it right becomes more important.
i check any new hanger i install, and all the old ones during tune ups too.

3... can be considered normal stuff, after a refresh/tune.

now go get some dirt on that fancy paint.

I bought a DAG-3 that should be arriving today. So I will check derailleur alignment for good measure, and will go through the rest.

you could have saved about 100 dollars on a similar tool...
unless you're a commercial bike shop, a der. hanger checker will be rarely used.
they are basic devices
many folks create their own home-spun hanger gauges.
even the most basic home spun ones are adequate.

You got a great tool, don't let anyone tell you differently. Good tools are worth their weight.