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dglshrn
I've got the 30/56 rims on my ultracycling bike, and never had any issues with crosswinds. I've not ridden the LB25/55 rims, but the shape is very similar to the Zipp 404 Firecrest shape, and I have found those a bit twitchy in high winds. I've been really impressed by the LB 30/56 rims so I'd probably go for them. I wouldn't use them with 25s though - I think they'd be too wide for 25s. I use them with 30mm G-One Speeds, and even with 30mm tyres the tyre is only just wider than the rim. Should be OK with 28s though.