CREATE TABLE table_19910 ("Series Ep." CLOB, "Episode" FLOAT, "Segment A" CLOB, "Segment B" CLOB, "Segment C" CLOB, "Segment D" CLOB)

How many segment C are there in the episode where segment D is bicycle tires?
SELECT COUNT("Segment C") FROM table_19910 WHERE "Segment D" = 'Bicycle Tires'
SELECT COUNT("Segment C") FROM "table_19910" WHERE "Segment D" = 'Bicycle Tires'