Building carbon wheel: what's my margin of error on ERD measurement?
I busted a rear rim, which has an ERD of 541 mm according to the supplier. I'm going to reuse the old hub and most of the old spokes that appear to still be good. A lot of the rims I'm seeing now are ~544 mm ERD, meaning my spokes are going to be ~1.5 mm short. That's no big deal right? I mean I remember working on the wheels before, and they appeared seized up, like I couldn't tighten them anymore without twisting the spokes altogether. so 1.5 mm shouldn't be a problem, right? at what point does it start to be a problem? 2-3 mm?
also, I'm reusing most of the spokes, but replacing some of the spokes that appear even slightly off. would it be a big deal if I use different spokes for the replacements? the young's modulus for the spokes might be different, despite having similar tensions..