DT Swiss XR 391 Disc Brake Rim
The DT Swiss XR 391 is the narrow member of DT's welded cross-country race range: 25mm inside for 1.9 to 2.2in race tires, welded, tubeless-ready with Squorx nipples and PHR washers, and very light. It is the DT Swiss rim for cross-country racers who prefer a narrow bed and the lightest possible alloy wheel.
This page covers the DT Swiss XR 391 Disc Brake Rim in 29in. The XR 391 is not sold bare. You choose the hub and the rest of the build in the configurator, and it ships from our shop in Georgia laced, tensioned and trued by hand.
Design and construction
The factory extrudes the XM 421 from premium aluminum and precision-welds the seam, which gives a lighter, stronger joint than a sleeve and a perfectly round tubeless bead. The 25mm inner width gives a 2.25 to 2.5in trail tire improved sidewall stability and traction compared with the old 21mm rims, without the weight of a 30mm section. The tubeless bed seats most tires with a floor pump.
How it rides
An XR 391 wheel is as light as an alloy 29er wheel gets and keeps a 2.1in race tire round and fast. It is a race rim; for wider tires the XR 361 is the choice.
Specifications
| Wheel size | 29in |
|---|---|
| ERD | 605 (29in) |
| Inner width | 25 mm |
| Depth | 17 mm |
| Drillings | 28h |
| Weight | 440g (700c/29in) |
| Material | Aluminum |
| Tire type | clincher tubeless compatible |
| Brake | Disc |
| Profile | Triangle |
| Nipples | External |
| Finishes | black |
This listing
This is the 29in listing of the XR 391, 28h, about 440g, 25mm inside, 17mm deep, disc. Pick the size that matches your frame; the profile and construction are the same across the range.
This is the disc-brake XR 391: plain sidewalls, no brake track to wear, a touch lighter. It fits any disc-brake bike and it is the version most of our customers now build; the rim-brake version is a separate listing.
Sizes, fit and compatibility
The DT Swiss XR 391 Disc Brake Rim comes in 29in and 28h drilling. It is a disc-brake rim. We build the XR 391 on 350, 240 and 180 hubs, Industry Nine SOLiX and 1/1, Hope Pro 5 and Bitex BX 211 hubs, usually with Sapim Laser, D-Light or CX-Ray spokes or Competition and Aerolite, and brass or alloy nipples.
Tire range on the X 392 is 2.0 to 2.25in. Pick cross-country as your bike type in the configurator and it recommends a spoke count and lacing pattern.
What DT Swiss says about testing
DT Swiss tests rims as part of complete wheels in its Performance Test Center in Biel. DT Swiss states that test methods and parameters vary with the intended use, the maximum system weight and the ASTM F 2043 riding conditions, and are written into an internal factory standard which "ensures compliance with the current international standards (e.g. ISO 4210)". Published methods include a wheel impact test (with and without tire, monitoring rim buckling, spoke tension and run-out), a drum test in which a wheel loaded to its permissible system weight rolls over obstacles on a steel drum for a set mileage, a lateral stiffness test and a burst pressure test. No impact energies or cycle counts are published.
Each rim page states a maximum system weight and ASTM classification: the R 460 road rim is rated "Max. System weight 110 kg", "ASTM classification 1" and not approved for e-bikes; the RR 481 is rated 130 kg, ASTM classification 2 and "Approved for e-bikes Yes (max. 32Km/h or max. 250W)".
DT Swiss's videos
From DT Swiss
Certifications
- ISO 4210 / ASTM F 2043 — DT Swiss states its internal factory standard 'ensures compliance with the current international standards (e.g. ISO 4210)' and sets test parameters by ASTM F 2043 riding conditions (self-declared, no certificate published) (source)
- ASTM classification per rim — R 460: ASTM classification 1, max system weight 110 kg, not e-bike approved; RR 481: ASTM classification 2, max system weight 130 kg, approved for e-bikes (max. 32 km/h or max. 250 W) (source)
- UCI approved wheels — UCI list version 2024.10.02 lists DT Swiss complete wheels, e.g. ARC 1100 DICUT 700C 38 SPO (02.05.2024), GRC 1100/1400 DI 700C CL 30 and CL 50, AR/ER 1600 SP and A/E 1800 SP 700C/650B CL 30, ARC 1100/1400 DI 700C CL 38 (all 13.06.2024); earlier ARC/ERC/PRC/GRC models 2016-2023. Component rims are not listed individually (source)
- Warranty — 24 months legal warranty on all products; lifetime warranty for first owners of carbon component rims bought after 1 March 2025; Fair-Share crash replacement for carbon rims available 10 years after purchase (source)
Sources on DT Swiss's site:
- Performance test center | DT Swiss
- Warranty & Fair-Share | DT Swiss
- Fair-Share Policy & Warranty | DT Swiss
- R 460 | DT Swiss
- RR 481 | DT Swiss
DT Swiss publishes those results; ProWheelBuilder builds the rim into a wheel and does not test it in a lab.
Building it at ProWheelBuilder
DT Swiss makes the XR 391; ProWheelBuilder is an independent wheel builder in Georgia, not the manufacturer. Every XR 391 wheel we build gets spokes cut from the rim's measured ERD, is tensioned in stages with a gauge, stress-relieved and trued before it ships. Tubeless tape and a valve are fitted on request.
In the configurator you will only see parts that fit this drilling; combinations that are not made are struck through, and the price updates as you pick.
Warranty
DT Swiss's warranty. DT Swiss covers its products against material and manufacturing defects for 24 months from purchase, excluding wear parts such as bearings and tubeless tape. Carbon rims and carbon wheels bought new since 1 January 2020 carry an extended guarantee to the first owner against defects in material and workmanship, and DT Swiss runs a paid crash-replacement scheme on carbon wheels for up to ten years from purchase.
ProWheelBuilder. If we lace this into a wheel for you, that wheel also carries ProWheelBuilder's own one-year warranty, which covers broken spokes regardless of cause and all wheel-related labor, including truing and rebuilding, for a year from purchase. Where a rim or hub is covered by its maker, we make the manufacturer's claim for you and coordinate it; where it is not, we offer an eligible replacement rim or hub at 25% off current retail. Shipping to and from us is the customer's. This cover does not extend to wheels built from components you supply yourself.
Full terms are on our Policies & Warranty page.
XR 391 Disc Brake Rim questions
What tire width suits this rim?
25mm inside is the all-road and gravel width. Think 32 to 45mm tires: wide enough to support a gravel casing properly so it holds its shape at low pressure, narrow enough that a 30mm road tire still sits right if you swap wheels between bikes.
Which spokes and nipples suit the XR 391?
For most riders a double-butted spoke such as Sapim Race or DT Competition with brass nipples; lighter riders can go to Sapim Laser or CX-Ray. The configurator recommends a gauge and count for the XR 391 from your bike type and weight.
Is it tubeless-ready?
Yes. DT Swiss lists the XR 391 Disc Brake Rim as clincher tubeless compatible; we tape and fit a valve when you choose the tubeless option.
Which spoke count should I choose?
It depends on your weight, terrain and the hub, not the rim alone. The configurator recommends a count from your bike type and rider weight, within the drillings this rim is made in.
How long will the wheel take?
Build time comes down to parts availability rather than bench time. The estimated ship date is shown in the configurator before you check out.
Not sure? Text or leave a voicemail on 470-253-0929 or email info@prowheelbuilder.com — you will be talking to the people who build the wheels.
