A gear change, wet weather and a distance rise.

It's a combination trainer Colin Scott hopes can inspire Speediness to a breakthrough Group One win in the George Ryder Stakes at Rosehill on Saturday .

Disregarding Speediness's last-start Canterbury Stakes failure, Scott expects the six-year-old to stamp himself as a genuine Doncaster Mile contender with his performance in Saturday's 1500m race.

Speediness has been thereabouts at Group One level, including a luckless fourth in the Toorak Handicap and a close third to George Ryder rival Boban in the Emirates Stakes.

A second-up placing behind star mare Appearance in the Apollo Stakes signalled he was on-track for a fruitful autumn.

Then came a seventh in the Canterbury Stakes when nothing went right.

"We've decided to just put last start behind us," Scott said.

"He over-raced badly and Damien (Oliver) said he made a bit of a noise so we're of the theory he maybe choked down."

That prompted Scott to apply a tongue tie for the Ryder.

"He's had a couple of really solid hitouts this week in the tongue tie and he hasn't missed a beat," Scott said.

"He's come right on fitness-wise."

Rosehill is rated heavy but the track conditions don't concern Scott who believes the horse is at his best on rain-affected ground.

"I'm very confident whatever the going is he'll get through it," he said.

Speediness has 54kg in next month's $3 million Doncaster Mile, 5kg less than he will carry under the weight-for-age conditions of the Ryder.