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Hello /n/, I'm here with a bit of a dilemma.
Whenever I ride my bike for 5+ miles (hoods with drops on descents), my lower back starts to hurt like mad. If I shift a few gears up, stand, and pedal strong the pain goes away and is replaced by a warmth, similar to that in your thighs after you finish a climb. This has been happening for the past 2 months or so, since I started biking.
When I purchased the bike I got a complementary fit, but I was told it was possible the stem was a bit long. Could this be the problem? I figured not because the pain also existed on my last bike, one with a much less aggressive fit (hybrid).
I haven't had any major back problems (not even into my 20s yet), but I did have some pain in the area from time to time, usually after lifting.