Table: vallelunga_sb_race
Columns: rider
bike
laps
time
grid

Question: What is the largest Grid that has a Bike of honda cbr1000rr, and a Time of +20.848, and a Lap greater than 24?
SQL: SELECT MAX("grid") FROM vallelunga_sb_race WHERE "bike" = 'honda cbr1000rr' AND "time" = '+20.848' AND "laps" > 24