Originally Posted by
TCR Rider
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did you normally use 165mm cranks before the TKR? Turned out that I didn't need to make any adjustments to my bike. Still using the 172.5's ...
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Long story but essentially, I peddled OEM 175s on many bikes over the years. The 165s were a waypoint after a TKR >4 yrs ago, ending with sub-90 cranks/ROM issues. With the revision-TKR it looks like the new norm is now, 165s, which is not a bad outcome given the articles about triathletes without knee problems who've transitioned to even shorter cranks to increase performance. The info I wanted to pass on for anyone dealing with musculoskeletal issues is that based on my experience, use of >165mm cranks will require a passive ROM >120° and an active ROM >110°.