Shoving each other with hips, bums and shoulders while skating 20 kilometres per hour is an unlikely event for a mother and daughter, but according to a pair readying for a roller derby decider, "it's on".

Key points: The Salty Dolls and the Mile Die Club clash in the Adelaide Roller Derby Grand Final

The Salty Dolls and the Mile Die Club clash in the Adelaide Roller Derby Grand Final Mother and daughter will also team up in the Adelaide rep team to compete in Utah

Mother and daughter will also team up in the Adelaide rep team to compete in Utah Grand final referee is also a family member

Didi Harris "Trinket" and her daughter, Taylah Wilkinson "QT", will be representing their respective teams the Salty Dolls and the Mile Die Club for the Adelaide Roller Derby Grand Final on Saturday in a sport where torn ligaments, bruises and sprains are common.

Groups of four blockers will skate around a concrete rink while trying to stop the opposing team's jammers from shoving past and scoring a point for each blocker passed.

"I'm a jammer so I'll be trying to get past the blockers," Trinket said.

"QT's a blocker so she'll be trying to stop the jammers and stop me, maybe not with an elbow because that's a penalty.

"We like to win fairly."

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Trinket has faced her daughter several times after QT was drafted to a different team about seven years ago.

She said the two were very competitive when it came to roller derby and did not even let each other go to the gym more often than the other for fear one of them will get an edge.

"The sledging has started," Trinket said.

"We went around to a teammate's house and they've got the trophy there from last year and they were all quite smug about it, but I'm like 'no'."

If there is an illegal elbow, in an ironic twist, it will be another member of the family who adjudicates the penalty, Trinket's son, Ashley "Truffles" Wilkinson — a mixed roller derby player who is guest referee for the bout.

Trinket said there would be no favouritism between daughter and mother but there might be words on the rink.

"He's a very good ref so I guess, if I disagree, or I notice something, I'll ask for his perspective and most of the time I'll agree with it," she said.

The roller derby has been growing since it was launched in Adelaide during 2008. ( Supplied: Stephen Muller )

QT said their respective teams, the league's two inaugural sides after it was established in Adelaide during 2007, were as competitive as they were.

"The Salties and Dies have always just been super competitive, so when it comes to grand finals, it's on," she said.

A skating legacy

Trinket, who has custom-made skates and a helmet labelled with her name, said she loved skating long before the roller derby arrived on her radar and did not let motherhood get in the way.

"I would try and sneak out and go for a skate to the shop but I could never go by myself," she said.

"It didn't take long until they were great skaters, so we'd all just skate together."

Didi uses customised roller skates labelled with her derby name, Trinket. ( ABC Radio Adelaide: Malcolm Sutton )

Trinket became interested in roller derby after a friend told her there was a "sport on skates".

"I was like, 'woah', and I've never missed a game since."

Playing an assisting role to launch the first Adelaide game for the Women's Flat Track Derby Association (WFTDA), her children, Ashley and Taylah, became inspired to play as well.

"We all skated in the street so it just seemed like a natural progression," Trinket said.

"It was one of my main goals in life, to hope that my children could be involved in sport, and I feel like I've achieved that goal."

Taylah Wilkinson and Didi Harris size each other up ahead of Saturday's Grand Final. ( ABC Radio Adelaide: Malcolm Sutton )

Shortly after the grand final, QT and Trinket will join forces in the city's combined representative team, the Adelaidies, to compete in Utah for an international WFTDA tournament.

Trinket said that the Adelaidies were seeded 11th in a competition of 12 but pointed out that last time they were invited overseas to compete at an open tournament in Japan, they won.

"We're definitely the underdogs in this tournament but we don't care," she said.

"We're excited to go."

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Time to cool off

QT considered the generational inclusion to be "one of the cool things about roller derby".

"What other sports are there where a mother and daughter are playing at an elite level together in the same team and going overseas together?"

Before they leave for the United States, however, there's a battle to be fought this weekend and it's likely to be fiery.

In fact, QT admitted that she sometimes needed half an hour to cool off before talking to her mother after a game, especially if the Dies lose.

"By the time we get to the after-party, it's alright, but when it's fresh, I'm like 'nup'."

The Roller Derby Grand Final is being held at the Wayville Showgrounds on Saturday with the Wild Hearses and Road Train Rollers also to play-off for third place.