I'm sure different tire manufacturers have a lot to do with it. I've been running Pirellis on my Suzuki for the past several years and I generally just move the one or two wheel weights I have on the front wheel to wherever my static balancer tells me to. I quit using wheel weights on the rear wheel when I stopped being able to locate a consistent heavy spot. I get it as close as I feel like messing with, then take the bike out and run it up to illegal speeds: so long as it doesn't shake I'm good with it, and it's been super smooth after every tire change.
I put Michelins on the 250 last Summer and didn't add weights to either wheel. It's fine.
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Don't think, look!
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