I bought my Canyon Endurace 8.0 AL in the summer of 2018, and since then I've ridden 14,500 KMs and 180,000 meters of elevation. The bike has only had one big service, where the rear derailleur, cassette and a brake lever were replaced. So, after 8 years, it's time to replace some parts.

Component	Model	Cost	Notes
Front Wheel	DT Swiss E1800	€62	Slightly different model than original, 23mm inner. The existing front wheel was buckled with some seized spokes.
Rear Wheel	DT Swiss E1800	€207	The hub had been damaged after a 105 cassette was installed in a previous bike service. Also, some of the spokes were seized on the old wheel.
Bottom Bracket	Shimano BS-R500	n/a	Got this as part of a bike shop service.
Cassette	Shimano CS-HG800	€66	My bike shop had fitted a 105 cassette 3 years ago, without my knowledge, so this time I reverted to Ultegra. Finding a 34t cassette was difficult.
Chain	KMC X11EL	€35	KMC make excellent chains, and now you can get a pre-waxed chain.
Front Brake Calliper	Shimano BR-R8170	€55	Again, on a previous service at my bike shop they didn't have Ultegra components in stock, so I ended up with an Altura level brake calliper.
Tyres	Conti GP 5000 AS	€129	After 3 years, and about 10,000KM, it was time to replace the tyres.
Saddle	Selle Italia NOVUS Boost Evo Endurance TM Superflow	€97	My old Selle Italia was getting a bit worn.
Chainring	Shimano ULTEGRA Chainring for FC-R8000 34T	€10	From primarily running on the small chainring, it got worn out.

Total cost comes in at €574 (plus bike service cost for bottom bracket and headset), which is about 35% of the original cost of the bike (€1864). I found it's best to learn to service your own bike where possible, as you can choose the exact components you want.

What's left to fix on the bike? The rear brake calliper is still Altus level, but I haven't bothered replacing it because the front brake is the primary. The brake discs could be improved, and the pedals are showing some wear.