Typically would only change limbs when they are damaged, but in my case I changed limbs because Elite would not sell me a 37 in the riser color / limb color combination I wanted. I'm old enough to be from the day when most target bows had white limbs, still like the look.
Never changed limbs other than one time I had a problem with a limb. Why would you otherwise unless there is a defect or something? Not sure I have kept a bow long enough to worry about strings other than the initial change after purchase.
My NFAA bow- new strings/cables at the start of every season.
My hunting and 3D bows.... whenever I start to see wear, which, so far, is "I haven't". But the oldest is 3 years old with maybe 75-100 shots thru it. The other one is new to me about 4 months ago, put new threads on it then.
Strings, depents on their condition. On average, I replace strings about every two years or so on two of my bows. The others bows have to wait a little longer, because of the money involved.
Limbs is a different story since they usualy last longer. I will replace limbs on my two "go to bows" in case of damage, limb splinter or such but than, after repair ( if possible ), they`re gonna be used on other bows, ( if possible ).
Like everyone else said, no reason to change limbs unless you want a different draw weight range or if they are damaged. I usually tell people that if you shoot often, change your strings every 2-3 years for performance, and every 3-4 years for safety.
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