American Standard 60 x 70-Inch Height Semi-Frameless Top-Roller Sliding Shower Door - AMS-AM00822400

It covers finished openings from 56 to 60 inches (1422 to 1524 mm) and stands 70 inches (1778 mm) tall overall. Measure your opening at the threshold, at mid-height, and near the top; the narrowest of those three readings has to fall inside the 56 to 60 inch range. Anything under 56 inches and this door won't compress far enough to seal.

The AM00822400 gives you 3/8 inch (9 mm) of adjustment for out-of-plumb walls and another 3/8 inch (9 mm) for level, and both can be dialed in while the door is hanging. That's the practical limit in a remodel: if your studs or tile walls run out more than 3/8 inch over the 70 inch height, the door will bind or leave a gap and you'll need to shim or correct the wall first.

You need a threshold or curb at least 2-3/4 inches (70 mm) wide. That's the bearing surface the bottom track lands on. A narrow tile curb or a thin tub rail that measures less than 2-3/4 inches across the top won't carry the track properly, so check the curb before you buy the door.

What governs it is the ledge, not whether it's a tub or a walk-in. You need a flat bearing surface at least 2-3/4 inches (70 mm) wide and a finished opening of 56 to 60 inches. Standard 60 inch alcove tubs with a wide flat rail meet both. Tubs with a rolled or narrow deck rail under 2-3/4 inches do not, and neither will a shower curb built narrower than that.

Semi-frameless is the middle path. This American Standard door keeps a header across the top with the rollers running in it, and the glass panels themselves carry no vertical frame, so you get a cleaner look than a fully framed door without the cost and the dead-accurate wall prep a frameless hinged panel demands. It's also more forgiving on an imperfect opening, since it takes 3/8 inch of out-of-plumb adjustment. Fully frameless is the pick if you want no visible header at all and your walls are true.

Rollers ride in the top header rather than in a bottom channel, so grit and soap scum in the sill are less likely to stall the door, and the rollers are visible and reachable for adjustment or replacement instead of buried behind a cover. Adjustment for plumb and level can be made with the door hung, which matters when you're setting these across a stack of near-identical bathrooms with slightly different tile work. Order the same finish code across the building, .006 for brushed nickel or .213 for silver shine, to keep units matching.

Yes, there's a towel bar on the exterior face with a slight curve to it, so you don't need to find wall space for a separate bar in a tight bathroom. It's part of the door, not a separate order.