I've posted before that I bought a new Gen 2 at the end of 2013, kept it 6 years and did 11k miles on it. I've recently had the first service done on my Gen 4, and the bike feels surprisingly stronger over 8k than my Gen 2 did. It does make me wonder why some people think they need tuning for road use. Has anyone else noticed this when changing from a Gen 2 to a Gen 4?