Back Pain

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I don't know what has changed from last year. So far this season every time I ride I have serious upper back pain after 20-30 min. Last year I could ride 1-2 hours before feeling any discomfort and after a 10 minute stop all was good for another hour so.

So far I have tried Corbin young gun with stock bars and risers. Same setup as last year.

Stock seat, bars and risers

Stock seat with back rest, stock bars and risers.

Corbin with Scootworks 2" up and back risers

Stock seat, stock seat with back rest and the risers.

Nothing has helped, risers actually made it worse.

At this point I am looking for any ideas that may help.......