The CS-D50CU-33 50mm carbon disc road rim from Xiamen Carbon Speed is widely regarded as an exceptional value, offering a modern wide profile (26mm internal, 34mm external), light weight (complete wheelsets around 1,150–1,400g depending on configuration), and customizable options at roughly half the price of premium brands. While crosswind stability, stiffness, and acceleration are consistently praised, some users report a harsh ride, hub bearing issues, and potential ETRTO concerns with 28mm tires on the 26mm internal width. The direct-to-consumer ordering process works well for those willing to communicate via WhatsApp, but warranty support and long-term durability remain open questions.
Pros
- Lightweight for depth and width: complete wheelsets often under 1,200g with carbon spokes; rim alone ~375–385g.123
- Excellent value for money: $850–$1,010 USD depending on configuration, undercutting premium brands.21
- Modern wide rim profile (26mm internal, 34mm external) provides good tire volume, comfort, and future-proofing.241
- Excellent crosswind stability and predictable handling, even in strong gusts.21
- Stiff construction with responsive acceleration and power transfer; good cornering confidence.41
- Customizable options: decals, finishes (UD paintless, glossy, matte), spoke types, hub choices.21
- Hubs feature 54-tooth star ratchet engagement; quiet and reliable when maintained.24
- Direct factory ordering via WhatsApp with good communication and fast production (2 weeks).41
- Tubeless setup is straightforward with hooked bead; tires seat easily with a booster.45
- Rims are well-made with precise machining and attractive finishes (e.g., UD paintless).15
Cons
- Some users report a harsh ride quality, even at low tire pressures, due to stiff T1100 carbon construction.14
- Hub issues reported: play, grinding noises, bearing stiffness; regular greasing recommended.1
- Potential ETRTO safety concern with 28mm tires on 26mm internal width rims; may expose sidewalls.1
- Spoke tension issues and loose spokes reported by some users.1
- No tubeless rim tape applied from factory; bearings and hub internals could use more grease.2
- Ordering process is factory-direct via WhatsApp, not a polished storefront; requires patience and communication.4
- Warranty support may vary; 1-year stated by one reviewer, 3 years by forum.41
- Long-term durability not fully tested; only 3 months of use in one review, no rapid wear test.2
Key Facts
- Complete wheelset weight varies by configuration: 1,159–1,200g with carbon spokes and in-house hubs; 1,310–1,320g with steel spokes and DT Swiss 240 hubs; rim alone 375–385g (T1100).123
- Rim dimensions: 50mm depth, 26mm internal width (measured 26.3mm), 33mm external at edge, 34.1mm at widest point.12
- Material options: T1100 or T1100+T800 carbon layup; spoke options include 3.2mm, 3.8mm, 5.0mm carbon or steel (e.g., Sapim CX-Ray); hub options include in-house (standard or ultralite HS606) or DT Swiss 240 EXP.14
- Price: $850 USD for a set with carbon spokes and in-house hubs; $1,010 USD for a set with DT Swiss 240 EXP hubs and Sapim CX-Ray spokes.21
- Warranty: 3 years (forum), 1 year (YouTube review); system weight limit 100kg for ultralite hubs, no limit for standard hubs.14
- Tubeless compatible with hooked bead; easy setup with Continental GP5000 STR and Tufo Gravel Thundero tires; no rim tape pre-installed from factory.245
- Production time: 2 weeks (YouTube), 15 days (forum); shipping adds 15 days; total delivery typically 3–4 weeks.41
- Rider weight limit: 85kg rider used successfully; ultralite hubs have 100kg system limit; potential durability concerns for heavier riders.31
Reviews & Ratings
09:48The reviewer discusses a custom set of carbon road bike wheels ordered from Shaman Carbon Speed, which is likely the company 'Xiamen Carbon Speed' referenced in the part name. They state the wheels are 50mm deep, have a 26mm internal width and 34mm external width, and weigh approximately 1,400g. The reviewer highlights the exceptional value, wide rims, light weight, and performance in holding momentum and accelerating. They mention the wheels are made from T1100 carbon fiber, come with in-house DT Swiss style ratchet hubs with a 54-tooth ratchet, and are laced to straight-pull carbon spokes. The ordering process was via WhatsApp, and the wheels arrived within a month. After a year of use, the reviewer is impressed, though notes a trade-off in comfort due to stiffness.
18:34The reviewer discusses the CS-D50CU-33 disc brake 50mm depth carbon road rim 33mm (Xiamen Carbon Speed) extensively throughout the video. They highlight that these rims are newly released by Carbon Speed and are among the lightest they have ever featured on their channel. The reviewer emphasizes the value proposition, noting the modern rim width profile, carbon spokes, ceramic bearings, and star ratchet hub engagement at a price point of $850 USD. They also mention the customization options available directly from the factory, including decal colors and finishes. The reviewer tested the wheels in various conditions, including high winds and rough pavement, and found them to be stable and responsive.
07:16The reviewer discusses their experience with Xiamen Carbon Speed wheels, specifically mentioning a 50mm depth carbon road rim model. They highlight using these wheels for several months across different terrains and frame sets, noting their performance in various weather conditions. The reviewer emphasizes the wheels' specifications, including carbon spokes, ceramic bearings, and a 54-tooth Star ratchet design. They also mention the wheels' aerodynamic optimization, durability, and value for money.
A Reddit user shares their new custom-built road/gravel bike featuring a Waltly titanium frameset and lightweight carbon wheels from Xiamen Carbon Speed (XMCS). The discussion focuses on wheel specifications, build process, and component choices.
AI Summary
Pros
- Lightweight wheelset (1230g for 50mm depth)
- Custom titanium frame with extensive design iterations
- High-quality components (SRAM Force XPLR groupset, Chris King seatclamp)
more pros in the review
Cons
- No real-world ride feedback yet due to weather
- Some budget components (AliExpress bar tape, bottle cages)
- Potential durability concerns with ultra-light wheels for heavier riders
more cons in the review
Key Points
- Wheels: XMCS 50mm carbon rims, Sapim CX-Ray spokes, in-house hubs, 1230g total weight
- Frame: Custom Waltly titanium, $1800 including design iterations and shipping
- Groupset: SRAM Force XPLR with 50T Garbaruk chainring and 10-46 cassette
more key points in the review
The CS-D50CU-33 is a 50mm deep carbon road rim from Xiamen Carbon Speed (XMCS) with a 26mm internal width and 33-34mm external width, designed for disc brake road wheels. It is available in T1100 and T1100+T800 layups, with options for carbon or steel spokes, various hub choices (in-house or DT Swiss), and finishes such as UD paintless or glossy. Users report weights around 1159-1200g for complete wheelsets with carbon spokes, and around 1310-1320g with steel spokes and DT Swiss hubs. The rims are praised for their stiffness, crosswind stability, cornering confidence, and wide tire profile, though some users note a harsh ride and potential hub issues. The product is generally considered a high-value option compared to premium brands.
AI Summary
Pros
- Lightweight for depth and width, with complete wheelsets often under 1200g with carbon spokes.
- Excellent crosswind stability and predictable handling, even in strong gusts.
- Great cornering confidence and stiffness, with responsive acceleration and climbing.
more pros in the review
Cons
- Some users report a harsh ride quality, even at low tire pressures.
- Hub issues have been reported, including play, grinding noises, and bearing stiffness.
- Potential safety concerns with 28mm tires on 26mm internal width rims, as it may violate ETRTO recommendations and expose sidewalls.
more cons in the review
Key Points
- Depth: 50mm
- Internal width: 26mm (measured 26.3mm)
- External width: 33mm at edge, 34.1mm at widest point
more key points in the review
Hi all,
After a bit of a delay, I’m finally sharing my first impressions of a prototype gravel wheelset from XM Carbonspeed. I had a chance to chat with Peter from XMCS at Eurobike and received the wheels at a discounted rate in exchange for providing honest feedback here.
Unboxing & Initial Impressions
• Finish: Matte satin surface, golden water-transfer logos, raw titanium spokes, black hubs and nipples – very clean, high-end look.
• Rim profile: 42 mm outer / 33 mm inner width. Looks massive at first glance, but pairs surprisingly well with 40–45 mm tires and creates a smooth aero transition.
• Build quality: Excellent. The internal finish is flawless – no carbon debris, resin residue or visible imperfections.Measured Weight (kitchen scale)
• Front: 615 g
• Rear (HG freehub): 720 g
• Total: 1,335 gThe XDR version is ~3 g lighter. Very impressive numbers for such wide rims with titanium spokes. XMCS claims T1100 carbon – which could explain the low weight, assuming durability holds up.
Tubeless Setup
• Tape: Buckless 35 mm
• Valves: Buckless aluminum
• Sealant: Schwalbe Doc Blue (60 ml front / 65 ml rear)
• Tires: Tufo Gravel Thundero – front 40 mm, rear 44 mm (both used)Setup was straightforward – both tires seated immediately with a Tyre Booster.
Measured Tire Widths (@32 psi, compared to Zipp 303s)
• Front: 39.6 mm → 43.6 mm
• Rear: 43.3 mm → 47.6 mmNext Steps
I’ll be testing them further on my custom titanium gravel bike – visually a perfect match. Ride impressions to follow soon.If you have any questions or want specific feedback, feel free to ask!
Patty30Patty30Where to Buy
CS-D50CU-33 disc brake 50mm depth carbon road rim 33mm wide clincher&Tubeless ready
CS-D50CU-33 Disc brake carbon road / gravel rim
XMCS 26mm IW 50mm depth T1100 carbon 700C road/gravel bike wheelsets with 24/24H in-house hubs and Sapim CX-Ray spokes
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