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1 1/4 is overkill for the lowers. granted, overkill is good, but 7/8" are fine. Most guys i know only run 7/8" without issue and is all i am running. Unless you beat it like a bouncer, you don't "need" 1 1/4 heims. especially on the uppers, they see far less stress than the lower do.
as for the tube, once again, overkill is not a bad thing and strength greatly depends on your over all length of the links themselves. a longer link will need a stronger material to better resist bending.
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beat up rusted out k5
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