bart1927 wrote: The bigggest Expedit (20 cubicles) is 150 x 150 cm, which means each cubicle is about 35x35 cm. That means you can fit about 100 78's in one cubicle.
Actually the biggest Expedit has 25 cubicles, each 33cm x 33cm x 39cm deep (inside measurement).
I get around 150 shellac discs, or 7 albums, to each cubicle. In fact, 15 of the cubicles in mine which hold 10" records, have also got about 20 discs sitting flat on top of the upright discs

I also use the top surface of the unit for storage, and there's 16 portable gramophones & electric record players sitting up there too, so I'm sure I've got way more weight in mine than Ikeas recommendation.
Mine sits in a redundant hallway next to the dining room (now gramophone room), and I actually stand on the lower shelves with my back against the wall, when I want to reach a machine close to the ceiling
I think I've had the unit about 3 years or so, and the shelves show no signs of bowing, and the whole unit is as sturdy as the day I put it together. Being plasterboard lined walls, I didnt think using the brackets that came with the unit would offer any extra support whatsoever, and naturally, the position of the shelves & carcase dont line up with the wall studs either, so I left it completely free standing.
When I assembled it however, I did use a good quality PVA glue on every join, so it's a lot more solid than I think it would be without the glue.
It's surprizing just how strong the Expedit is, especially considering the shelves are only about 15mm thick laminated chipboard, but I think because the horizontal shelves are all one continuous plank running between the outer upright ends (with small vertical cubicle dividers), and only a 33cm spans in each cubicle, the 15mm board is quite adequate to support the weight of 150-170 discs without the board distorting in any way.
I'd have no hesitations getting another 25 cubicle Expedit for the rest of my 78s & for my vinyl records, if I could only find somewhere to put it lol.
My hallway is only 90cm wide, which makes it impossible to photograph my storage front on, so this was the best I could do.
One good thing about having my records in a narrow hallway is that I dont have to worry about trying to make it look pretty front on with colour co-ordinated sleeves etc so it looks nice in a living area.