Lycranaut

A cyclist wearing lycra clothing.

This term is generally used in a snarky and/or negative way towards cyclists, so being called a lycranaut is not necessarily considered a good thing.

Reference
The lycra- part comes from lycra, a type of clothing material often worn by and associated with cyclists due to its stretch and aerodynamic qualities. The -naut part comes from the ancient Greek word naut meaning a voyager, farer, or tripper. Thus, a lycranaut is a lycra-wearing voyager.

Forum Introduction

 * Take this, you lycranauts http://bikearlingtonforum.com/showthread.php?p=128550#post128550

Links

 * Wiktionary: -naut https://en.wiktionary.org/wiki/-naut