Originally Posted by HillRider

Most of the plastic dropout protectors I've seen aren't very durable and don't stay in the dropouts securely (despite the OP's experience) unless the are taped in place. Also, most new bikes come with only a front dropout spacer since they are generally shipped with the rear wheel in place.

I have an S&S travel bike so the travel axles were needed at both ends and had to be durable enough for many uses.