HE'S A SPOKESMAN FOR A WORTHY CAUSE.(SPORTS)

Byline: FELLICIA SMITH Staff writer

Bill Gervisio used to be an avid cyclist, but he has given up the sport except for special occasions.

The annual Multiple Sclerosis North Country Expedition Bike Tour is one of those exceptions. The weekend event, which begins Saturday, has become a must-ride for Gervisio and nearly a dozen of his co-workers at Lockheed Martin Knolls Atomic Power Laboratory In Niskayuna.

``I'm going to do it every year as long as I'm able,'' said Gervisio, who has ridden on the tour four times.

Last year approximately 200 cyclists from the Capital Region took part in the tour, which is used as a fund-raiser for the …