Couple or three thoughts:
You can add or remove a minimum of one complete link, it's not possible to add or remove a half link.
If your chain got thrown into the spokes, it's probably a limit screw problem.
You don't have to "suspect" anything regarding chain length, simply check for the right length by running the chain around the largest cog/largest chainring, without running it through the rear derailleur, find the nearest point the chain could actually be connected, and add one inch (one full link)-
Last edited by well biked; 11-08-08 at 10:49 PM.