It's the wind
Biking and sailing go hand and hand. Sailors long for a steady 10knot wind, bikers dread it. They are the ying and yang of wind appreciation. Plus they physically complement each other. Nothing better then a 4 hour hard bike ride followed by a relaxing sail. And bikes and sailboats can both be very beautiful: my girls are a pacific seacraft 25 double ender and a domane 6.9.