Joined: Jul 2007
Posts: 8,630
Likes: 3,542
From: South shore, L.I., NY
Bikes: Trek Emonda SL7, Cannondale Topstone, Miyata City Liner, Specialized Chisel, Specialized Epic Evo
A lot of them can and are designed for this.
Obviously lowers the bottom bracket and with a trend towards lower b-brackets in general, subsequently going to a 27.5 means pedal strikes. Also and if not designed for it, the front handling gets wonky.
Usually the 29/27.5 capable bikes I see are designed for 27.5 plus, so a 3” tire, which puts height closer to a 29.