"The way Hayden is improving, it's obviously going to be a very hard match-up but, thankfully, I've got the experience in the event to bring me through because some of the events are new to Hayden.
"Last time he was riding the omnium, it was just starting up at the Olympics and it wasn't competitive then. There are a couple of events in there that tactically are quite different, with the flying lap for example - it's not just something you can jump on a bike and go well in. If you have a good event there, you're set up for the omnium and, thankfully, that's an event I'm pretty good at."
The six-discipline omnium in Invercargill begins with the flying lap on Wednesday. Other disciplines include a 30km points race, elimination race, individual pursuit, scratch race and time trial. The omnium replaces the individual pursuit, the points race and the madison at the Olympics, starting in London next year.
New Zealanders Aaron Gate (who won the national omnium title at the same track last month) and Marc Ryan will also be riders to watch, along with Australian Scott Law.
"I'm definitely motivated," Archbold said. "It's all I've thought about for the last year. I've pulled out of the teams' pursuit for the Oceania Champs purely because I want to ride the omnium and ride it well. It makes it hard for selection because obviously only a certain number of riders can go to the Olympics and it makes it harder if you're only riding one event but I'm definitely motivated to get that spot."
Archbold goes into the two-day event in good form, having helped PowerNet team-mate Josh Atkins win last month's Tour of Southland. Roulston, the defending champion, had to pull out of the race due to kidney stones.
Archbold took pride in the fact his young team did so well in New Zealand's biggest tour. The leadership role he took will also have helped his development as a rider.
"Growing up, I never chose one event and stuck to it. I always did a bit of this and a bit of that. And it was the same with training, even though I didn't know anything about the omnium, I never let one side of my training slip. It's obviously paying off now."
Even so, his quick rise has taken him by surprise. Now he is the man everyone around the world wants to beat. "After the last season, every race [I won] was a surprise. More and more it was 'oh, that wasn't a fluke, it was pure talent'."