Taking bike to Australia with Singapore AA

Has anyone had personal experience in the last 12 months or so of taking a bike with them on hols to Australia using Singapore Airlines? Wondered what was the procedure checking the bike-bag in (any dramas with weights, sizes etc) and mainly any experience with Australian Customs at Perth airport and their dislike or anything that`s seen British soil in the past. 
I`ve read SAA guidelines about cycle transport and it`s clear as mud, so I`ve fired off an email to `em, still waiting for a reply, I want to take the bike-bag as my single piece of checked-in luggage (20kg limit) it`s just the size may be a concern. :?

I`ve read SAA guidelines about cycle transport and it`s clear as mud, so I`ve fired off an email to `em, still waiting for a reply, I want to take the bike-bag as my single piece of checked-in luggage (20kg limit) it`s just the size may be a concern. :?
Jens says "Shut up legs !! "
Specialized S-Works SaxoBank SL4 Tarmac Di2
Specialized S-Works SaxoBank SL4 Tarmac Di2
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Re check-in: this is a censored shoot. Usually from the Oz end you will get away with checked bags up to about 28kg, but this is up to the person on the desk. I've no idea of the situation in the UK; someone else should chip in about this. Size usually isn't an issue, but weight is. IME, it's a waste of time trying to get anything concrete out of any airline re baggage policy - it's all up to the person on the desk on the day. Get there early and be nice to them!!!
Re dirt: You MUST clean the bike extremely thoroughly when coming to Oz or NZ - quarantine are very keen on keeping nasties out. I'd suggest either bringing brand new tyres or cleaning them with a toothbrush before packing the bike away. The bike may well be inspected and if it's dirty you may have to wash it, and perhaps pay for the privilege of doing so.
Bike will be spotless, they mentioned dis-infecting the tyres and letting the air out, I`m just going to fit a new set of tyres, never seen UK soil
Specialized S-Works SaxoBank SL4 Tarmac Di2