I went to the briefing in Perth a couple of weeks ago. The bike is what you would expect for a freebie. Seems perfectly suitable for the trip. But it's not an MTB, a standard frame, no suspencion, good basics like brakes, wheels, gears, etc. Not a lightweight or an old heavyweight, basic pedals, without straps or clips, basic saddle. Don't know if the tyres are the kevlar lined puncture resistant type, suspect not. So working on points of contact "milesaway" is spot on, ie, hand grips, pedals and straps/clips, and your own saddle (the seat stem ought o be ok). They will have mechanics there who will help you get it organised. If you want drinks bottles and panniers or a bag, there aren't bottle cages or a pannier frame. You would also want spare tubes (what size?), pump, tool kit, first aid, etc. I cant remember if the Handlebar Stem is fully adjustable, and that could be important to you as you are already suffering some discomfort. (Backache relief -Try raising your handlebar stem on your current bike, so that flat bar is at the same height as your seat.) At the briefing they made the point very strongly that as most bikers are male the distance from seat to handlebars is designed for men, ie, for a given height men have longer torsos whereas women have longer legs, hence the adjustable stem enables you to shorten that distance by hinging it back. There will be plenty of fresh fruit available, but you haven't given yourself much time to get any nutrional drinks and nibbles that you prefer.
I may have raised more questions than answers. The organisers at email@example.com
might be worth contacting.
Really looking forward to this.