Haverworks Theseus75 vs Sirius Ursa Major V2Wired Hub vs Wireless
Choose the Theseus75 for its integrated USB hub and extensive plate options, or the Ursa Major V2 for wireless freedom and immediate availability.
![[Group-Buy] Haverworks Theseus75 - Barebones Kit](https://cdn.shopify.com/s/files/1/0064/2560/8282/files/Theseus_Cover.jpg?v=1719675485&width=3840&quality=75)
![[In Stock] Ursa Major V2 Wireless Aluminum Ultimate Keyboard](https://cdn.shopify.com/s/files/1/0549/0262/0278/files/6c52287aa620d9b01f572bd83c42e80.png?v=1755679989&width=3840&quality=75)
Which one should you get?
Get the
Haverworks Theseus75
Wired Hub
- Includes an integrated USB 2.0 hub with passthrough for peripherals.
- Offers a choice of six different plate materials (FR4, Aluminum, Brass, PC, POM, Carbon Fiber).
- Features a sophisticated hybrid gasket and grommet mount system with PORON foam.
- Wired-only connectivity requires both a host cable and an interconnect cable.
- Very heavy at 2.9kg, limiting portability.
- Is a group-buy product with an estimated future shipping date, not immediately available.
Get the
Sirius Ursa Major V2
Wireless
- Offers dual-mode Bluetooth and wired connectivity.
- Listed as in-stock and ready to ship from the vendor.
- Lighter weight (1.4kg) and potentially more portable footprint.
- Lacks RGB lighting of any kind.
- Only includes an FR4 plate, with no other material options mentioned.
- The vendor description does not detail the same level of acoustic dampening foams or mounting customization as the Theseus75.
Your primary need dictates the choice. For a clean, cable-free desk with multi-device flexibility, the in-stock Sirius Ursa Major V2 is the practical pick. If your workstation is a permanent command center where you value direct peripheral connectivity, extensive sound tuning, and a premium unboxing experience, the Haverworks Theseus75 is worth the wait, despite its group-buy status.
The differences that matter
Skip the 40-row spec sheet. These are the specs that change how each board feels, sounds, and fits your desk.
Haverworks Theseus75
Sirius Ursa Major V2
Connection
Wired
Bluetooth, Wired
Case material
Aluminum, Polycarbonate
Aluminum
Weight
2,923 g
1,400 g
Plate material
Aluminum, Brass, CarbonFiber, FR4, Polycarbonate, POM
FR4
Screw-in stabilizers
No
Yes
- Haverworks Theseus75
- Sirius Ursa Major V2
- Performance
- 8067
- Build quality
- 8782
- Productivity
- 9198
- Customizability
- 9391
- Portability
- 7990
- Hot-swappable
- Ergonomics: Split
- Knob
- QMK
- VIA
- Sound dampening
What will you mostly use it for?
The Ursa Major V2 is the clear choice for mobile professionals and office users who prioritize wireless connectivity and a lighter build. The Theseus75 dominates for stationary, feature-focused setups like gaming battlestations and content creation desks, thanks to its USB hub and superior modding potential. For programming, both are equally capable due to their shared firmware support and split layouts.
Pick the Haverworks Theseus75
- The Theseus75's wired-only connection ensures consistent latency, as no polling rate is specified for the Ursa Major V2's wireless mode.
- Its integrated USB hub allows direct connection of a gaming mouse or other peripherals.
- The vendor description mentions a cushioned typing feel from its gasket and grommet mount, which may aid comfort during long sessions.
Haverworks Theseus75 vs Sirius Ursa Major V2 specs
Every tracked spec, side by side. Rows marked with a dot differ between the boards.
11 of 24 specs differ
Haverworks Theseus75
Sirius Ursa Major V2
Hot-swappable
Mount style
Sound dampening
Screw-in stabilizers
Layout standard
Ergonomics
Knob
Display
Connection
Max polling rate
Battery
USB passthrough
USB-C
Case material
Plate material
Weight
Dimensions
Typing angle
Backlight
QMK
VIA
N-key rollover
Mac & Windows
Released
Compare prices
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Haverworks Theseus75 vs Sirius Ursa Major V2: your questions
Only the Sirius Ursa Major V2 offers wireless connectivity. It supports both Bluetooth and wired USB-C modes. The Haverworks Theseus75 is a wired-only keyboard.
Yes. The Theseus75 features an integrated USB 2.0 hub. According to the vendor description, this allows you to connect devices like a mouse or macropad directly to the keyboard.
Yes, both support extensive reprogramming. They are compatible with QMK and VIA firmware. The Ursa Major V2 also mentions a dedicated app called LNE Link+ for remapping without flashing.
The Haverworks Theseus75 includes a significantly wider selection. The kit comes with or offers plates in FR4, Aluminum, Brass, Polycarbonate, POM, and Carbon Fiber. The Ursa Major V2 kit includes an FR4 plate.
For competitive gaming where latency is critical, its wired mode with a 1000Hz polling rate is suitable. However, for wireless gaming, the manufacturer only specifies a 125Hz polling rate for Bluetooth, which may not be ideal for fast-paced titles.
The Theseus75 uses a proprietary LEMO-compatible interconnect cable system. The kit includes the panel-mount sockets, a 0.8m woven cable with push-pull connectors, and the necessary daughterboards.
The manufacturer claims a battery life of up to six months on a single charge, powered by a 2400mAh lithium battery. Actual battery life will depend on usage patterns.
The Haverworks Theseus75 is substantially heavier, with a kit weight of 2923 grams (about 6.44 lbs). The Sirius Ursa Major V2 weighs 1400 grams (1.4kg).
No. Both products are sold as barebones kits. This means you need to purchase your own mechanical switches and keycaps separately to complete the build.
According to the vendor page, the Ursa Major V2 is listed as 'In stock and ready for shipping.' The Haverworks Theseus75, in contrast, is a group-buy item with an estimated shipping date in the future.
The Theseus75 uses a hybrid mounting system. It combines PORON foam gaskets with snap-in silicone grommets, supporting both top-mount and friction-mount (screw-less) assembly styles.
Yes, the product specifications list 'Screw-In Stabilizers' as an extra feature for the Sirius Ursa Major V2.
Not sold on either?
![[In Stock] OE93 Wired/Wireless Retro Style Mechanical Keyboard](https://cdn.shopify.com/s/files/1/0549/0262/0278/files/93_-1_1--001.jpg?v=1748489495&width=3840&quality=75)
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