>>2047199
>after a 3 hour, 8 mph relax ride at grandpa pace
This is the issue right here. You're probably riding a relatively aggressive (long and low) position, which would be fine if you were riding aggressively with full muscle activation, but you're not, and so your posterior chain isn't activated, and that means your torso is not supported, so a few muscles in your lower back have to do all the work just to keep your spine erect, and a lot of weight is going into the saddle because you're not bearing down on the pedals like you should be on a bike like that

If you want to cruise around, get an upright cruiser with a big soft spongy saddle, if you want a zippy carbon fred sled, ride it like one

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