Thanks for all the thinking along and advice!
First things first: I've installed the chain and aligned the rear wheel.
It is really close, but it does not look like it is touching from this view:
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It is also hard to see if the chain is running straight, but maybe you have a better look on it...
But I will also first try to deflate and inflate my tire again and ride a few kilometres with it so that the tires are settled in the rim correctly. Maybe that also helps creating a little bit more clearance.
If I understand it correctly my wheel already has a dished sprocket, so bringing it more outwards looks challenging.
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Next I also turned around the stem again. I do agree it looks a lot better this way. I have to take it for a test ride to set up the bike to my preferences anyway and I'm also still able to place the seat more forward/backward if needed. Those zero-reach stems also look nice, so I'm going to keep those in my when things don't work out.
I also received a kickstand and mounted it. I'm not too happy with it yet as I can not get it tight enough that it does not rotate around the frame itself, but that should be easily fixed with some anti-slip pads or something between the kickstand and the frame.
Also found some nice green pedals (9/16") so mounted them with the afore mentioned adapters.
So this is the current status: Ready for a test drive when the weather gets a little bit better.
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Next steps:
- Head and tail lights; I saw a nice headlight that I want, but I'm not sure how to mount it yet on my triple tree fork.
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- Fenders; Still have to look into that. I was told to look for 26/100 size fenders. But I did not find something I really liked. I would like to have a short fender at the rear, but all I could find are half circle fenders. So still some searching to do there.
- Front brake; I have the disc brake installed on the front wheel. I also found already a caliper that would fit. Now I still need to find a nice lever and the knowledge how to install.
- Some touch-up on the paint; During the install some parts got a little bit damaged. Especially the fork took some beating. Any tips on how to touch-up these damages?
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Keep you feedback and advice comming!