add bike bearing play repair blog post

input/blog/2022/2022_05_21_bike_spokes.md

 
 Even though I heard bad things I have to say rebuilding a wheel is not that hard.
 Just read through some tutorials on the web or watch some YouTube videos on the topic and try it yourself!
+
+Also take a look at [part 2 of this repair](2022_05_25_bike_shifter.html)!

input/blog/2022/2022_05_25_bike_shifter.md

+title: Blog
+post: Bicycle Repair, Part 2
+description: Adjusting the rear wheel bearing play
+date: 2022-05-25
+comments: true
+---
+
+If you haven't done so, also take a look at [part 1 of this repair](2022_05_21_bike_spokes.html)!
+
+On my first ride after repairing the broken spokes, I noticed a large amount of play in the rear wheel.
+Of course I was quite worried and not sure what's going on.
+So I went to another bike shop, not the same as last time, as this one was on my way home from work.
+They told me the rear hub is probably broken and can only be repaired by the manufacturer.
+Also, the soonest they could look at it would be in August.
+
+So I went home and did a bit of research.
+Turns out, my Shimano Alfine 8-gear shifter is working like most other hubs, and the bearing play can be adjusted easily.
+
+For this, the break disc has to be removed with the special tool again, like last time.
+Then the lock nut and the conical nut are already visible, and were completely lose in my case.
+
+<!--%
+lightgallery([
+    [ "img/shimano_alfine_1.jpg", "Hub with lock nut removed" ],
+    [ "img/shimano_alfine_2.jpg", "Conical adjustment nut lifter slightly " ],
+    [ "img/shimano_alfine_3.jpg", "View into the bearing" ],
+])
+%-->
+
+The inner nut fits a 15mm wrench, the outer nut needs 17mm.
+Unfortunately, to lock the nuts again, you need a special flat 15mm wrench, a standard one won't fit.
+
+<!--%
+lightgallery([
+    [ "img/shimano_alfine_4.jpg", "Standard 15mm wrench is too thick" ],
+    [ "img/shimano_alfine_5.jpg", "Flat wrench fits perfectly" ],
+    [ "img/shimano_alfine_6.jpg", "Locking nut with normal 17mm wrench" ],
+])
+%-->
+
+When the bearing is too lose, the wheel has too much play and wiggles noticeably.
+Too tight on the other hand, and the wheel won't spin much after giving it a push.
+So try to find the sweet spot in the middle, then lock the second nut tightly agains the first one.
+
+That's it, hopefully now we're really good to go! 🚴