Would this work as a replacement base for a DXRacer king series chair?

It's a standard diameter so yes. I've replaced the base on an x-rocker chair, and it made an immediate improvement

Struggling to remove the old base from my old is it possible that the base and cylinder is one piece?

I know this is a very old comment but for anyone else who might see it, the cylinder can be hard to remove. There's many YouTube videos about it but what worked for me with a really stubborn one was having half the legs of the base on the side of a bed and hammering the cylinder directly from the bottom, hard. I'd spent 10 minutes trying other methods but this eventually worked.

I have a gas lift that starts off 40cm then expands to 50cm. I'm unsure if this base will work with this or not?

This 'spider' like all these seat bases are universal; I ordered mine as a replacement for a defective existing base it fitted and worked very well. You should have no problems.

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Mastery Mart Office Chair Base Replacement for Office/Desk/Swivel Chair with Cap, Universal Gas Cylinder Socket and Caster Sockets, 28"(70 cm) Heavy Duty 2200 Lbs/1000 Kg (Matte Black)

Mastery Mart Office Chair Base Replacement for Office/Desk/Swivel Chair with Cap, Universal Gas Cylinder Socket and Caster Sockets, 28"(70 cm) Heavy Duty 2200 Lbs/1000 Kg (Matte Black)

Product ID: 176752688

Details

Brand
MASTERY MART
Colour
Black
Material
Metal
Product dimensions
70D x 70W x
Size
70D x 70W x cm

📏28-inch universal base diameter

🔧Easy installation with included kit

⚙️2200 lbs heavy-duty load capacity

€ 147.68

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Upgrade your throne with the ultimate heavy-duty base — because your chair deserves the best!

BUILT TO ENDURE - Premium-grade metal base supports up to 1000 kg for unmatched durability.
EFFORTLESS UPGRADE - Includes installation package and clear instructions for a quick, tool-free swap.
ROCK SOLID STABILITY - Reinforced design meets BIFMA and ANSI standards for long-lasting performance.
SLEEK MATTE BLACK FINISH - Modern, professional look that complements any workspace aesthetic.
UNIVERSAL FIT ZERO HASSLE - Compatible with almost every office, gaming, and swivel chair on the market.

The Mastery Mart Office Chair Base Replacement is a 28-inch diameter, heavy-duty metal base designed to support up to 2200 lbs (1000 kg). Featuring universal gas cylinder and caster sockets, it fits nearly all office, gaming, and swivel chairs. Finished in sleek matte black, it meets industry standards (BIFMA and ANSI) for durability and stability. The package includes an easy-to-follow installation kit and a base cap, making it a quick and reliable upgrade for your workspace seating.

Specifications

ASIN	B07ZY36NJ1
Age Range Description	Adult
Arm Style	Armless
Assembly Instructions Description	Included, Easy to follow
Back Style	Solid Back
Best Sellers Rank	124,404 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 392 in Desk Chairs
Brand Name	MASTERY MART
Colour	Black
Customer Reviews	4.7 4.7 out of 5 stars (980)
Finish Type	Matte
Form Factor	Recliner
Frame Material Type	Metal
Furniture Base Movement	Swivel
Furniture Finish	Black,Matte
Included Components	Caster
Indoor Outdoor Usage	Indoor
Is Assembly Required?	Yes
Is Customizable?	No
Is Electric	No
Is Extendable	No
Is Foldable	No
Item Depth	70 centimeter
Item Dimensions	70 x 70 x 10 centimetres
Item Dimensions D x W x H	70D x 70W x 10H centimetres
Item Shape	Round
Item Weight	4.95 Pounds
Leg Style	wheels
Manufacturer	Mastery Mart Co., Limited
Manufacturer Part Number	Mastery Mart
Material Type	Metal
Maximum Weight Recommendation	997.9 kg
Model Number	Mastery Mart
Number of Items	1
Number of Packs	1
Pattern	Solid
Product Care Instructions	Wipe Clean
Reclining Position Count	1
Recommended Uses For Product	Gaming, Office
Room Type	Game Recreation Room, Office
Seat Height	28 Inches
Seat Material Type	Metal
Set Name	Chair Base Set
Size	70D x 70W x 10H cm
Sleeping Bag Filling Material	Foam
Special Features	11mm x 22mm, Durable, Easy to Replace and Install, Heave Duty, Quality Guaranteed
Style Name	Contemporary
Surface Recommendation	Hard Floor
Theme	Contemporary
Tilting	No
Unit Count	1.0 count

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