The first thing to figure out when choosing a used suspension fork is whether the condition and controls align with how you ride. This SR Suntour XCT fork is listed at USD 64.99, and it fits a specific set of needs: a 27.5-inch wheel size, a 1-1/8" threadless steerer, a post disc brake mount, and 100mm QR dropouts. It's a used part, so the decision comes down to whether the simple suspension design and visible scuffs are acceptable trade-offs for the price.
Quick verdict
The SR Suntour XCT is a used suspension fork for someone who wants a functional replacement without complicated adjustments. The description says it is a little scuffed but fully functional, with preload-only and no lockout. If you are okay with that, this fork can be a solid match for a disc-brake 27.5-inch bike.
Who it suits
This fork suits a rider working on a 27.5-inch bike with disc brakes and a standard 1-1/8" threadless headset. The 100mm QR dropouts mean it pairs with quick-release wheels, not thru-axles. Riders who never use a lockout on climbs will not miss it, and if you prefer a simple coil-sprung feel without external damping knobs, this preload-only design keeps things uncomplicated.
What stands out from the listed details
The steerer tube measures 184mm, which gives you some stack to work with above the head tube, though the final fit depends on your frame height. The crown-to-drop measurement is 470mm, a figure that can affect the bike's front-end height and geometry. The post disc brake mount accepts a caliper directly, and the 100mm QR dropout width is made for quick-release hubs.
The preload-only adjustment means you can change the initial spring tension, but you cannot adjust compression or rebound, and there is no lockout for climbing. That is a fair trade if you ride mostly on trails and do not need the fork to stiffen up on smooth sections.
Meaningful trade-offs
The used condition shows as scuffs, so the fork is not meant for a showroom-perfect build. The lack of a lockout is another trade-off: on paved climbs or when pedaling out of the saddle, the fork can bob. The preload knob helps you set the feel but it cannot replace a lockout. This is a used part, so be comfortable with prior wear and a basic suspension function.
Product notes
SR Suntour XCT 1-1/8" Threadless Suspension Bike Fork Disc Blank

Choose this fork if you need a 27.5-inch suspension fork with a 1-1/8" threadless steerer, a post disc brake mount, and 100mm QR dropouts at the listed price of USD 64.99. The main limitation to weigh is that it is preload-only with no lockout, so you cannot firm up the fork for smooth climbs or stop the bob with a simple switch.
Bottom line
If your build or repair calls for a 27.5-inch fork with a 1-1/8" threadless steerer, disc brake mount, and QR dropouts, the used SR Suntour XCT at USD 64.99 is a concrete option. Its scuffed finish and no-lockout design mean it is not the most polished or feature-rich choice, but it is a functional, straightforward suspension fork for the right rider.