astro
Join Date: Mar 2006
Location: Pennington, NJ
Posts: 355
Bikes: Raleigh Sports, '72, Bianchi Volpe, '97 (no more, it died), Greenspeed GTVS6, '05, Trek 520, '13
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Not sure about asymmetric, but you could try short cranks or crank shorteners. I suppose if you did that only on the left, it would be asymmetric! In any case, crank shorteners are what I used before my total (right) knee replacement (and I only had 1, how did you ever do 5???).
Good luck,
Ed