Rumors have stated the "Apple Watch Series 8" could come in three size classes, with the largest being a 50.5mm display, up from 45mm in the current model.
Apple has sold the Apple Watch in two sizes since it was released in 2015, with only slight size bumps thanks to shrinking bezels. This may change thanks to a new larger model that could be as large as 50.5mm.
Display supply chain analyst Ross Young has a highly accurate leak history regarding displays. The latest information comes in response to someone's question about "Apple Watch Series 8" display sizes.
According to Young, the new display size would be 1.99 inches, which converts to about 50.5 millimeters. Assuming Ross is using the same scale and limitations that Apple does, this is a significant jump from the largest model currently available at 45mm.
New size is larger, 1.99".
— Ross Young (@DSCCRoss) July 4, 2022
The first three generations of Apple Watch had 38mm and 42mm displays, then the fourth through sixth generation had 40mm and 44mm displays. Finally, the Apple Watch Series 7 increased this size to 41mm and 45mm, thanks to the display curving over the edges.
Apple hasn't introduced a new size class to Apple Watch since the device debuted, and despite increasing display sizes, all bands fit their respective large or small model. This 50.5mm Apple Watch would be a new larger model and likely require its own set of bands.
The "Apple Watch Series 8" is expected to be announced in September alongside the iPhone 14 lineup. New expected features include a rugged model, this larger size class, and new health sensors.