UDH dropout on a Specialized gravel bike frame

Buying a New or Used Gravel Bike? Check the Dropout Before You Commit to SRAM 1x13

If you’ve been shopping for a gravel bike recently — new or used — you’ve probably run into the term UDH and wondered whether it matters for what you’re building. The short answer is: it depends on what groupset you want to run. The longer answer is that a lot of popular gravel frames have had their dropouts quietly updated mid-generation, which means two bikes with the same name and similar looks can have very different futures when it comes to drivetrain compatibility. ...

May 19, 2026 · 8 min
Factor Ostro VAM V2 Build

Factor Ostro VAM V2 Build

The Factor Ostro VAM V2 is designed to be both lightweight and aerodynamic — a combination most bikes used to compromise on. I found this frame in almost new condition and built it up exactly the way I wanted. The build runs a mixed Shimano Ultegra/Dura-Ace Di2 12-speed groupset, a Quarq DFour power meter crankset, and BTLos Aerix Pro 52mm wheels with DT 350 hubs and Sapim CX-Ray spokes — coming in at around 1290 grams for the set. One detail I’m particularly happy with: a custom ASA 3D printed headset spacer I designed to match the Tavelo Avro integrated bar and stem setup. ...

April 9, 2026 · 1 min