What will the 49ers' biggest challenges be down the stretch?

Photo by Ezra Shaw/Getty Images We gave you three options to determine what would, if anything, hold the 49ers back in the second half of the season Welcome to SB Nation Reacts, a survey of fans across the NFL. Throughout the year, we ask questions of the most plugged-in San Francisco 49ers fans and fans across the country. Sign up here to participate in the weekly emailed surveys.
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Following a gritty win in Tampa Bay, the 49ers are in position to make their patented late-s