Btw on a change of subject. How many miles would we expect to get out of our chains? I am wondering if I should order a chain for the end of the summer and with parts being tough to get I am getting a little concerned as the miles rack up on my bike.
There is going to be a lot of variance in chain life depending on environment, use model, and maintenance. To me, it isn't important to know when it will wear out given you know for sure it will wear out. Anyone with this bike has more than $7,000 into it. It doesn't seem unreasonable to have $100-$200 of consumable spare parts on hand and a proper chain checker tool. Here is what I suggest in order of priority of how fast they wear out:
1. 2 sets of spare brake pads: Shimano L03A (I got about 1300 miles on my front, 1600 on back)
2. Spare 114 link chain: CN-HG701 116 link (I also keep an extra compatible quick link in my ride tool bag)
3. Spare rear brake rotor: RT-EM810 (This is a special one with a magnet integrated for speed pickup, and harder to find)
4. Spare front brake rotor: SM-RT800 (Even if they don't wear fast, you could bend a rotor and be happy to have a spare)
Tools:
Pedro's Chain Checker Plus II (well reviewed. There are other brands/options)
Chain Quick Link Pliers (needed in future to remove quick link)
11 speed compatible chain break tool (Needed as stock chain doesn't have Quick Link)
(Also needed to remove extra links - measure to old chain before removing links and account for the quick link)
Park Tool FR-5.2GT (to replace rotors, can use version without 12mm center guide but it makes it nice to align)
Chain Whip (to replace rotors)
These items don't go bad over time like tire rubber or tubeless sealant so even if they sit for a year or two there is no harm.