Hi all. I'm from Sydney and i'm working on a renewable energy project. I have a mountain bike which has been on three mountain bike races, 1. 24 hr, 2. 8hr races. At the moment i'm riding 3 to 4 times a week and each ride is about 30 km plus. Next week I will be up grading to 45km plus and one big ride each week to work which is 60 km each way.