2 centimeters
Probably the 3/8 inch spike. I have found that to be common in high cross country running. IN track you probably only want to use a 1/8 inch spike.
The question is ambiguous: do you mean the length of the pins, or the size of the shoes? If you are asking about the length of the pins, there is not a single right answer, because it depends on the type of running you are doing (for example track sprint vs. cross-country), and the surface you are running on.
The recommended size for what??!
an Olympic size track has how may lines
A baby track, is a track that is much smaller then an average track (half the size)
A king size bed is recommended for a master bedroom.
No. A spike buck can grow more points in subsequent seasons. Some hunters believe that a spike buck has a diminished potential rack size, and cull them for that reason, but it is possible for them to grow more points in subsequent seasons.
Q: What is the recommended size for the boot file system? A: The /boot file system is recommended to be 50MB.
Yes some of them do. My YMCA track has an indoor track that is upstairs. It is not a full size track though.
About 1 1/2 inches
7.5 or 8 is recommended