San Francisco 49ers running back Jarryd Hayne (38) runs the ball away from Pittsburgh Steelers inside linebacker Vince Williams (98) Sunday, Sept. 20, 2015, in Pittsburgh.
San Francisco 49ers running back Jarryd Hayne (38) runs the ball away from Pittsburgh Steelers inside linebacker Vince Williams (98) Sunday, Sept. 20, 2015, in Pittsburgh. Don Wright AP
San Francisco 49ers running back Jarryd Hayne (38) runs the ball away from Pittsburgh Steelers inside linebacker Vince Williams (98) Sunday, Sept. 20, 2015, in Pittsburgh. Don Wright AP
49ers with Matt Barrows

49ers with Matt Barrows

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Snap analysis: Mike Davis, not Jarryd Hayne, serves as 49ers’ backup tailback

September 21, 2015 05:20 AM