The problem is with the desciption "Bike Pump hole"
These are designed to take many diferent fittings.
I would be tempted to use a drill and a 1/8 NPT to make it all fit.
It is 1 hole and 3 forth .
There 4 eighth inches in a half inch and 8 eighth inches in an inch.
An eighth of and inch is half of a quarter of an inch!
One-eighth of an inch.
an eight of an inch is 3mm or 0.3cm
No, one eighth of an inch is 3.175mm and is therefore shorter than 5mm (there are 25.4mm to an inch).
1.25 tenths of an inch.
6.687898089171975 inches rounded to the nearest one-eighth inch is 6.75
an eighth of an inch... just over 3mm
If you can draw a line 1 inch long and divide it into 8 equal parts, then each of the segments would be an eighth of an inch long
Yes, you just need to find a special headset bearing.
Half an inch.