The B17N is the hardest Brooks but they can sag over time, then a bit of tightening with the tension nut is needed, only a bit, just enough to take out the sag.
@Stephen2012 started
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The B17N is the hardest Brooks but they can sag over time, then a bit of tightening with the tension nut is needed, only a bit, just enough to take out the sag.