First things I'd check:
- cupped/squared-off tires (particularly the front); can look fine at first glance, but cupping/feathering in particular can cause some very jacked-up handling
- steering head bearings; lift front w/ stem stand, feel for notchy or loose action when pivoting & pull wheel front-to-back, feeling for looseness
- wheel bearings; spinning freely?
- rear wheel alignment; adjusted chain or replaced tire recently? I think it would have to be off pretty badly to feel as you described, but it's worth a check
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