Expect the larger 15L unit (MT955B) to cost about $344,000.

The flagship 18L MT975B will command a price tag of about $440,000.

While talking prices, AGCO says, for comparative purposes, the larger wheeled tractor is about $90,000 cheaper than its tracked equivalent, namely the MT875B.

All this leaves potential customers to weigh up the pros and cons associated with the long-standing debate as to whether tyres or tracks are the better option.

Any confusion about 'B' series Challenger models shortly will become clear as production ceases in November, ready for the 'C' series to emerge by year’s end.

Expect, however, the upgraded 'C' series 700 and 800 tracked tractors to start arriving in March of next year.

It turns out that Challenger’s factory in Minnesota, sees a combination of just nine 700/800 tracked tractors, including the new 900 wheeled equivalent, roll off its production lines each day.

"The reason they can't build anymore is that Caterpillar is only building nine transmissions a day," explained David Eglington, Specialised Farm Machinery, who is just back from visiting the plant.

Built in Jackson, a town about the size of Goondiwindi, he says the facility also makes RoGator, Spra Coupes and Terra-Gator machines.

For the record, both the 15L and 18L wheeled newcomers are physically the same size (excluding the tyres and weights), relying on the same chassis and axles.

Late last week, Goondiwindi producers Remmick and Rodney Hohn fired up one of the two giant new Challenger wheeled tractors currently being evaluated in Australia.

With only a small paddock to get to grips with, Remmick clearly enjoyed the experience, commenting it steered well, the visibility was good, plus the main controls fell easily to hand.

"With this one (MT955B) you'd pull 50ft with no worries and you'd be able to pull anything with the bigger one," he said.