Your training log book contains nothing but daily century rides.
Neither rain, nor snow, nor sleet nor hail shall stop you from your appointed training ride.
You plan rides that start from Gunn and always seem to include a lunch stop at the Saturn Cafe in Santa Cruz.
You begin to get jittery after one full day of not riding.
You look at a century route and immediately start plotting out extra hilly loops.
You have to force yourself to take a break from your lunchtime ride and go back to work.
You spend New Year's day blocking out rides for the upcoming year, and discover that your Dayminder Calendar leaves you with less than 2 hours per week "quality time" for your non-cycling family and friends.
You frequently "take the long way home" after work and get home after 10:00 PM and 4000 ft of climbing.
You wear bike clothes and a Camelback to work even when you're not planning to ride that day.
You spend Sunday evenings replenishing the stash of batteries you have placed along Skyline so you can go for longer night-time rides during the week.
Any one of your bikes is worth more than your car.
You choose an apartment solely on the basis of whether or not it is flat enough to ride into and how close good roads/trails are.