My touring bike and road bike have a 34t chainring on them, and it is perfect for my needs as I am not a go fast rider. Spin around 80-90rpm in all combinations. Cassette on road bike is 11-32, and on the touring bike it is a 14-28 FW. The touring bike sees all terrains and I find the 34t gives me an appropriate low for most conditions. There is a 24t chainring available for extreme conditions.