No reads, but typical player here is loose passive. I've been thinking I'm overbetting overpairs when I think their good on the river like this hand. How much do you bet the river (if you do)?

Poker Room skin
No Limit Holdem Ring game
Blinds: $0.50/$1
3 players
Converter

Stack sizes:
Button: $109.10
SB: $108.90
hero: $112

Pre-flop: (3 players) hero is BB with A A
Button folds, SB calls, hero raises to $3, SB calls.

Flop: 8 5 T ($6, 2 players)
SB checks, hero bets $6, SB calls.

Turn: 7 ($18, 2 players)
SB checks, hero bets $18, SB calls.

River: 3 ($54, 2 players)
SB checks, hero bets $??? (around 82 left)