Measure between the oarlocks, multiply by 1.5 add 4-6" or measure from the tip of handle to the oarlock x 3. Not an exact science, but that will get you close.
I had a standard NRS seat bar with NRS low back seat. I had standard 6" oar towers and I'm 6'1" and I rowed my 156D with 9' sticks and I was very comfortable.
72 inch frame=10 to 9 foot oars. 66 inch frame=9.5 to 8.5 60 inch frame=9 to 8 foot oars 54 inch frame=8.5 to 7.5 This is a good guideline. If you are rowing lesser whitewater, class 1 to 3 go on the long end. If you are rowing greater whitewater go on the shorter end.
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