The Atlas sim racing seat accepts a handful of accessories straight from SIMGASM: a lumbar support cushion, spare cushion sets in other colours, a bass shaker on the built in mounting pattern, and a cup holder or headset holder on the extra accessory point. On top of that, the seat sits on the SIMGASM Seat Bracket Set and an optional seat slider. Together they turn a good seat into a setup that fits you exactly.
Which ones are worth it, and which can wait? Below you find what each accessory does, where it mounts and who benefits most.
Why the Atlas is built for add ons
The Atlas was designed as a platform, so accessories have a fixed home on the seat.
One base, many options
The patented Atlas design combines a shared lower base, an interchangeable GT or Formula upper section and matching cushion systems. Because the base never changes, every accessory point stays in the same place. You add parts over time without drilling, glue or cable ties.
That approach comes from experience. Johan Akkerman, CEO and product designer of SIMGASM, started sim racing in 2008 with a frame he welded from used gas pipes and a seat from a scrapyard. Later, at Trak Racer, he was responsible for the design of the TRX seat. He knows how messy a seat gets when every add on needs its own clamp.
Comfort accessories
Comfort upgrades are the first thing most drivers add, because they change how long you race without a break.
Lumbar support cushion
The lumbar cushion fits both the Atlas GT and the Atlas Formula. It sits in the lower back zone of the shell and fills the gap between your spine and the seat. Its memory foam shapes itself to your back over time. If you feel your lower back after an hour, this is the first upgrade to try. Read do you need a lumbar cushion in an Atlas seat for a full breakdown.
SIMGASM | Lumbar Support Cushion for Atlas Sim Racing Seat
Spare cushion sets
Separate cushion sets exist for the GT and the Formula. The covers are washable, and the GT sets come in red, white, blue and orange next to black. Many drivers keep a spare set ready, so they swap in fresh cushions while the other set dries. It also lets you match the seat to your cockpit colour.
Feel and immersion accessories
Tactile feedback is where the Atlas really saves you work.
Bass shaker on the seat
The shell has a predefined bass shaker mounting pattern. You bolt the shaker straight onto the seat, so road texture, kerbs and gear shifts travel through the shell into your back. No custom plate is needed. Our step by step article on mounting a bass shaker on an Atlas seat shows the details, and the guide on bass shaker tuning in SimHub helps you set clean effects.
SIMGASM | Seat Cushion Set for Atlas Formula
A slider for shared rigs
The SIMGASM Dual Locking Seat Slider Set moves the whole seat forward and back. Both rails lock firmly, so the seat stays put under hard braking. This is the accessory for families and shared rigs where drivers of different heights race on the same setup.
Everyday accessories
Small add ons make long sessions easier, even if they never change your lap time.
Cup holder
The SIMGASM Cupholder works with SIMGASM seats, monitor stands and chassis. On an Atlas seat, the extra mounting point keeps your drink within reach, so you stop leaving bottles on the floor next to the pedals. During an endurance race, that matters more than you expect.
Headset or accessory holder
The same extra point also takes a headset holder. For other spots on the rig, the SIMGASM Accessory Holder in black aluminium stores a headset, a controller or cables in a fixed place. Your headset stays off the floor and your cables stay away from the pedals.
SIMGASM | Atlas Sim Racing Seat Gran Turismo - Carbon
Which accessories should you buy first?
Here is a simple order that works for most drivers.
A practical order of upgrades
Start with the bracket set, because the seat does not mount without it. Add the lumbar cushion when your sessions run longer than an hour. Then pick a bass shaker if you want more feel, and finish with the cup holder or headset holder. Not sure how the seat itself goes in? Our guide on how to install an Atlas seat on your sim rig covers every step. You find the complete SIMGASM Atlas seat range in our shop, with GT and Formula versions in several finishes.
Questions and answers
Quick answers to common questions about Atlas accessories.
Does the lumbar cushion fit both Atlas versions?
Yes. It is designed for both the Atlas GT and the Atlas Formula shell.
Do you need extra plates for a bass shaker?
No. The Atlas shell already has a predefined bass shaker mounting pattern.
Are bass shaker parts included with the seat?
No. Brackets, extra cushions, lumbar support, bass shaker hardware and accessories are all sold separately.
Where does the cup holder go?
On the extra accessory point of the shell, or elsewhere on a SIMGASM chassis or monitor stand.
Want to learn more? The SIMGASM experts are happy to help.
