Bristol, whose England full-back Max Malins suffered a season-ending Achilles injury during the week, were forced to make a late change as George Kloska started in the front row after Max Lahiff was ruled out.
Three of Tigers’ five players that extended their contracts during the week played an instrumental role in giving the hosts the ideal start.
Solomone Kata made the initial break, with the ball then shifted on to Steward who moved it out to Hassell-Collins to scamper in on the left edge.
The lead last only two minutes, with a slip from South Africa fly-half Pollard as he attempted to kick clear gifting the Bears possession high up the field.
Bristol did not waste the chance, with Oghre finishing under the posts after being put through by former Tigers favourite Ellis Genge.
AJ MacGinty landed his conversion to put Bristol ahead for the first time, and quickly went on to extend the advantage after Oghre went over for his second try in five minutes.
While Hassell-Collins managed to respond by grabbing a second of his own after a loose ball from MacGinty was mopped up by Tigers’ attack, Ravouvou strolled over at the other end in a game that swung from end-to-end in ceaseless attacking waves.
While the Bears lost influential fly-half MacGinty to a knee injury just before the half-hour mark, their attacking endeavour remained and Mata grabbed a bonus-point fourth try moments later, before Lane finished off a sensational counter attack that started on their own try line.
Tigers had Bristol pinned back on their own whitewash when they reclaimed possession, shifted it right and into the grasp of Ibitoye, who set Lane up before going on to touch down himself for Bristol’s sixth try of an astonishing first half.
It was a record-shattering first 40 minutes for both sides, as Bristol had never scored more points in the first half of a Premiership game on the road while Tigers had never conceded so many at home.
Steward pulled a try back soon after the restart, with Bristol’s Oghre sent to the sin-bin at the same time after repeated infringements by the visitors.
Janse van Rensburg deservedly got among Bristol’s scorers, and Ravouvou came up with a incredible long-distance solo try as Pat Lam’s irrepressible outfit passed the 50-point mark.
And yet, Leicester managed to end the game with a try-scoring bonus point as Bassett went over in front of a crowd that had already dwindled by that later stage.
