It’s now time to dive into the inner workings of the Urban S21’s design. Right away you can see the Thermaltake twist-locking drive bay mechanisms for both your 5.25” and 3.5” drives though the HDD bay orientation is questionable from an ease in cable management standpoint. A single 2.5” internal mount solution for SSD installations is present at the bottom of the HDD bay and appears to be solid but actually requires you to flip the case over and thread mounting screws through the bottom of the case.
Moving to the back of the case, along the bottom, you can see small pads intended for the power supply to rest on which is meant to reduce noise while in operation. It is a nice thing to see included as most cases require some aftermarket solution for this.
If you move up just slightly you can see the reason behind the sturdy feel on the expansion slots. Thumb screw hold one side in place while the other half of the slot is wedged between the motherboard tray and the cases frame. With cards growing in size and weight it is always nice to see a rock solid securing method for expansion slots.
The last thing to take a look at inside the S21 is the motherboard tray and cable management solutions. The first thing that is instantly noticeable is the massive space allotted to the CPU backplane. While most cases provide this window for easy bracket installation for standard ATX boards, the Urban takes this one step further and provides a larger window to make this installation that much easier as well as possible on mATX boards should that be your fancy.
The cable management space is quite small behind the motherboard tray as to be expected in a smaller mid tower offering. This is helped a bit by the outer back panel bowing out for additional space but overall you are still looking at less than an inch of working room.
To help a bit with cables, Thermaltake has chosen to provide clips to go along with tie off holes to help us. While I really like the design and the function of these clips, they work quite well, I do feel like they could be of thicker construction.