Hey, i have been riding the bike a lot recently. I work as a messenger recently i have noticed a substantial increase in terms of my speed, my climbing ability, my energy level and overall my metabolism. I started to put in only 7 - 8 hours a day on the bike, but recently i have been able to surpass that by at least an hour or 2. Currently i am riding a fixed bike on 46/18, am i ready to gear up to 46/17 or should i wait more for risk of knee injury.
Currently i am using a front brake on the bike but i have noticed some irritation if i use my legs to slow the bike down too much. I fear that i am not challenging myself by staying on this ratio as i can climb many of the steeper hills still sitting down. What should i do.