I've just eliminated the same symptom by dropping my heel more. I moved the saddle down 3mm.
It's the time of year for achey lower backs (different bikes, riding harder etc).
That's good to hear, I will try dropping saddle height a tiny bit and stretching some more. amazing that 3mm was all it took, how bad was the pain?
@miro_o started
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I've just eliminated the same symptom by dropping my heel more. I moved the saddle down 3mm.
It's the time of year for achey lower backs (different bikes, riding harder etc).