If you look on their site the 29's have a 29cc sticker and the 30.5's have the same sticker in the same spot but it's blank. Maybe they photoshopped the 29cc out for their store pic.
Whatever, I trust them. Either way, I'm getting wrenching.
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It's "Dr. _paralyzed_" actually. Not like with a PhD, but Doctor like in Dr. Pepper.