In fact, the overall cost of living seemed pretty high to me.
In Sydney yes, totally ROFL prices, but I would move to London instead than Sydney. No benefit to move there imo unless you have to. Sod paying completely stupid rental prices and still commuting a few hours a day.
I rent in rural Australia, $280 a week, brand new 2 bedroom unit, reverse cycle aircon, built in wardrobes, backgarden and patio, single garage with drive.
Rent here usually includes council tax and water though, so weighed up like that its not that much dearer than the UK.
For a slightly smaller property in Wigan I was paying £495p/m plus £95 council tax and about £35 water.
Current conversion, $1120 converts to £700 making Australia slightly more expensive directly converted. Wage weighted, its about 30-50% cheaper.
As for bike parts, I buy some smaller things locally, we bought my GF a bike here. Everything else comes online from CRC/Evans etc, no GST/Import costs on things less than $1000.
Oh and get used to road riding 😉