2
The plastic cover is there to protect the wheel bearings.
It prevents dust from entering in.
So it's totally fine if it's loose.
2
Most likely you need:
3/8" diameter
26 tpi (thread per inch)
On the website below there is a list off all Shimano gear hubs which use this size nut:
https://www.sjscycles.co.uk/hub-spares/shimano-nexus-brim40-cap-nut-38-inch/
Please check if your hub is listed to ensure compatibility.
Source: https://forum.cyclinguk.org/viewtopic.php?t=98948
1
yes I'm pretty sure it should work. have not tried it myself but when you pump up a tube outside of the tire the diameter increases quite a lot (so the change in diameter from 26-27.5 or from 27.5-29") should not be an issue imo.
1
This image is the current recommendation.
Rim ID width +2mm (to allow for shape)
Stick on variety.
I use 2 laps of masking tape.
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