XMCS T1100 UL 26IW Ultralite

The XMCS T1100 UL 26IW Ultralite is a high-end carbon wheelset from XMCS, featuring T1100/T800 carbon rims with a 26mm internal width and ultralight construction. Users report exceptionally low weights (e.g., 1029g for a 50mm set, 1165g for a 58mm set with 3.2mm carbon spokes) and praise its crosswind stability, responsiveness, and build quality. However, some users note minor rotor movement and a front-wheel wobble that the manufacturer attributes to the ultralight carbon layup, and there is debate over the performance of titanium spokes versus steel.

Pros

Exceptionally light weight (e.g., 1029g for 50mm, 1176g for 65mm, 1227g for 65/78, 1290g for 58/65 with Ti spokes, 1165g for 58mm with carbon spokes).1 2
Excellent crosswind stability and confident handling in gusty conditions.1
Responsive and lively acceleration feel.1
High-quality finish and clean rim-to-tire transition with wide tires.1
Good value and positive customer service experience with Peter.1

Cons

Slight front-back movement of rotors (1-2mm) when brake is locked, though not noticeable while riding.1
Titanium spokes may be less stiff than steel spokes, with no stiffness-to-weight advantage.1
30mm tires are heavier than 28mm alternatives.1
Front wheel wobble in the inner part of the rim, reported as normal by the manufacturer due to ultralight carbon layup deforming under spoke tension.2

Key Facts

Reported weights: 50mm UL: 1029g (without tape/valves); 65mm UD paintless: 1176g (with tape/valve); 65/78 T1100/T800 UL: 1227g; 58/65 with titanium spokes: 1290g; 58mm with 3.2mm carbon spokes: 1165g.1 2
Rim material: T1100/T800 carbon.1
Internal width: 26mm.1
Available depths: 50mm, 58mm, 65mm, 78mm, and combinations (e.g., 58/65, 65/78).1
Spoke options: carbon (3.2mm, 3.5mm, 3.8mm) or titanium.1
Tire compatibility: 28mm, 30mm, 32mm; measured widths 31.8-35mm depending on tire and rim.1
Finish options: UD paintless, UD gloss, gloss finish.1
Compatible with disc brakes.1

Sources

1 Weight-WeeniesXMCS (XiaMen Carbon Speed) Wheels
2 Sumyumguy01 on ChinertownAnyone else have this wobble "issue" with their wheel? In the bike. same whee...

Reviews & Ratings

Wheelsets & Tires (Road) - Weight Weenies on Weight-Weenies15 days ago

XMCS (XiaMen Carbon Speed) Wheels

The XMCS T1100 UL 26IW Ultralite is a high-end carbon wheelset from XMCS, featuring T1100/T800 carbon rims with a 26mm internal width and ultralight construction. Users report exceptionally low weights (e.g., 1029g for a 50mm set, 1176g for 65mm, 1227g for 65/78, 1290g for 58/65 with titanium spokes) and praise its crosswind stability, responsiveness, and build quality. The wheels are compatible with wide tires (28-32mm) that inflate to 32-35mm, and are often used on frames like the Tarmac SL8. Options include carbon or titanium spokes, various hub choices, and finishes like UD paintless or gloss. While generally highly regarded, some users note minor rotor movement and debate the performance of titanium spokes versus steel.

AI Summary

Pros

Exceptionally light weight (e.g., 1029g for 50mm, 1176g for 65mm, 1227g for 65/78, 1290g for 58/65 with Ti spokes)
Excellent crosswind stability and confident handling in gusty conditions
Responsive and lively acceleration feel

more pros in the review

Cons

Slight front-back movement of rotors (1-2mm) when brake is locked, though not noticeable while riding
Titanium spokes may be less stiff than steel spokes, with no stiffness-to-weight advantage
30mm tires are heavier than 28mm alternatives

Key Points

Rim material: T1100/T800 carbon
Internal width: 26mm
Available depths: 50mm, 58mm, 65mm, 78mm, and combinations (e.g., 58/65, 65/78)

more key points in the review

View Thread

Sumyumguy01 of Chinertown in Road Bike Frames, Wheels & Components about 1 month ago

Purchased: 2026-08-09

Anyone else have this wobble "issue" with their wheel? In the bike. same wheel in my truing stand. These are new wheels, has about 60 miles on them. After the first ride I checked the wheels and found this wobble, it's on the front wheel only and the rear appears to be fine. What's odd is the wheel is still true, and the spokes tension is still even and consistent, only the inner part of the wheel has this wobble. I spoke to Peter and he said it's normal. He mentioned because of the ultralight carbon layup, the spokes can pull and deform the carbon to make this wobble. Wheel model is D58CU-33 26mm IW T1100 with HS606 hubs and 3.2mm carbon spokes. Weight is 1165g. System weight is about 75kg. You guys have any thoughts on this and does anyone else have this issue on their wheel?? Also, why doesn't the rear wheel have this issue as well? Peter told me to post in the forum as others have mentioned this? where?

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