But, after handing the Highlanders a bit of a hiding last weekend, the Crusaders carried on their impressive form. This bonus point win puts them fourth. A win over the Hurricanes at AMI Stadium next weekend and they will host a qualifying match at worst.
Rennie's men were quickly on the back foot thanks to the directness of the Crusaders forwards and their own offending at the breakdown, referee Jonathon White handing Chiefs skipper Craig Clarke a general warning.
But while the home side dominated early, the Chiefs held out until just under the halftime hooter when Read scored.
It was a significant blow. Denied from a similar position by Bundee Aki in their first clash in Hamilton in May, Read managed to ground the ball despite the attentions of Sam Cane and Tawera Kerr-Barlow.
The try, from a dominant scrum, was important because there were other echos of his side's Hamilton loss in the Chiefs' try to Aseali Tikoirotuma minutes earlier. Aaron Cruden - who charged down a Carter clearance to score in that match - was at again when disrupting Dagg's attempted kick, regathering and almost going in under the posts.
Kerr-Barlow's kick got the deserved reward - the Crusaders offending at the ruck - when Tikoirotuma cleaned up the scraps.
Liam Messam failed to show for the Chiefs after hurting his back during the week, which meant a start for Ross Filipo - his second of the season and first since his knee injury four months ago.
Messam's absence was keenly felt, but even the presence of All Black Messam wouldn't have helped his team's cause that much.
Dagg's try just after halftime was the dagger. It put the score out to 26-8 and it was quickly followed by Read's second, a good reward for the No8.
Ryan Crotty's try in the corner was the Crusaders' fourth, with Dagg once again featuring. For once, the Chiefs had few answers.
The Crusaders' sole concern is likely to be the ankle injury to Luke Romano which forced him from the field.
Charlie Ngatai scored a consolation for the Chiefs but replacement Tyler Bleyendaal, appropriately, had the last say for the Crusaders with a long-range intercept.
Crusaders 43 (Kieran Read 2, Israel Dagg, Ryan Crotty, Tyler Bleyendaal tries; Carter 3 cons, 4 pens) Chiefs 15 (Asaeli Tikoirotuma, Charlie Ngatai tries; Andrew Horrell con, Aaron Cruden pen ). HT: 19-8.