Stem length is a heavily debated topic, and really comes down to personal preference. The key is to feel comfortable in the cockpit. Modern bike geometry tends toward shorter stems, so we offer the Range in a 40mm and 50mm option. If you want a bit more weight over the bars to lengthen out that cockpit, and help on climbs, go with that 50mm. If you like a shorter cockpit, and to pick up that front up a bit more easily, go with the 40mm.