I was wondering if anyone could tell me - what is a reasonable speed/distance to travel? I'm fairly new to cycling and am planing a 1400 k ride. Due to the rough roads and the availability of fire trails where I live, I have a mountain bike. Is it reasonable to ride 100 k's a day with this, as I'm planing a trip from Sydney to Adelaide? I'm middle aged and slightly overweight and where I live is very hilly. On the hills I average 12 k's an hour. There is nowhere flat here, so I can only make an assumption of around 15k's an hour on the flat. Could or should I improve my times - or are these reasonable, in using a mountain bike?