$50 NLHE 6-max: Fold a straight on the river to a check raise?

[Hujiko]

PokerStars - $0.50 NL FAST (6 max) - Holdem - 6 players

BTN: 160.58 BB (VPIP: 15.38, PFR: 7.69, 3Bet Preflop: 0.00, hands: 13)
SB: 95.5 BB (VPIP: 28.57, PFR: 14.29, 3Bet Preflop: 0.00, Hands: 7)
BB: 114.12 BB (VPIP: 46.15, PFR: 46.15, 3Bet Preflop: 28.57, Hands: 13)
UTG: 101.12 BB (VPIP: 15.38, PFR: 12.82, 3Bet Preflop: 0.00, Hands: 40)
Hero (MP): 100 BB
CO: 159.58 BB (VPIP: 16.67, PFR: 16.67, 3Bet Preflop: 0.00, Hands: 7)

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has 7♣ K♣

fold, Hero raises to 2.62 BB, fold, fold, SB calls 2.12 BB, fold

Flop: (6.24 BB, 2 players) 6♦ 5♣ 6♣
SB checks, Hero bets 3.08 BB, SB calls 3.08 BB

Turn: (12.4 BB, 2 players) 3♠
SB checks, Hero bets 8.48 BB, SB calls 8.48 BB

River: (29.36 BB, 2 players) 4♥
SB checks, Hero bets 25.66 BB, SB raises to 81.32 BB and is all-in, Hero calls 55.66 BB

Spoiler

SB shows 5♠ 5♦ (Full House, Fives full of Sixes)
(Pre 52%, Flop 98%, Turn 100%)
Hero shows 7♣ K♣ (Straight, Seven High)
(Pre 48%, Flop 2%, Turn 0%)
SB wins 188 BB

I lead out preflop, flop and turn. The river completes my straight draw on a paired board.

I decide to value bet this hand as it is more likely that the villain has a over pair then that he has a full house. The villain however check raises me, putting me in a difficult spot.
I called.

Is this a mistake?

AA-KK would likely 3 bet preflop and also not likely to check raise me on a one card to a straight board. Other high pairs have good showdown value so not likely.
Leaves:
1) Missed flush draws (as I have two of them K7 not many of them exist that will call from the SB) preflop
2) Other straight either like 67, 77 or 78s - Not all might check raise here.
3) Full houses well all of them could have made this line

So in the aftermath I think I should have folded although it is only 56 BB more in a 132 BB pot (raked pot) giving me excellent pot-odds.


Wish I would have ....

Spoiler

Wish I would have made a smaller river bet such that I would have an easier fold against a shove.

 

[Alucard]

I'm folding preflop
also folding river at zoom stars without good reads. Probably not gonna bet that much on river as well. But not too small cause he could jam a 6 as well exploitatively.
His SB flatting range is very small pp heavy as well.

 

[Viparida]

Hardly to say dude these sb- bb fights are Always strange. I personally try to no commit too much when that happens even if i think the sb is bluffing.

 

[Alexchen]

Man for this whole hand I just want to talk about the preflop......you open 7Ks in the MP......Seriously?