VeloBuild VB-TT-023

Chris from VeloBuild recommended size M for a 182 cm rider with 85 cm inseam, and size S for a 172 cm rider with 80 cm inseam. Geometry is similar to the Trek Speed Concept, so comparing to Trek's sizing chart or using geometry comparison tools is recommended.

The frame uses a T47 bottom bracket with an 86.5mm shell width (often T47i or inboard). For SRAM DUB cranksets, a T47 DUB bottom bracket with 86.5mm shell width is needed; SRAM's DUB T47 Road BB (85.5mm) has been used successfully.

Yes, but routing cables through the stem is very challenging due to limited space; SRAM wireless is strongly recommended for simplicity. Mechanical shifting/disc brakes are possible but not recommended due to routing difficulty.

No official mount; users have designed and 3D-printed their own brackets or purchased generic aluminum mounts from AliExpress. For Garmin mounting, users have designed 3D-printed parts that attach to the baseplate or bottle rail, or used a zip-tied plate between extensions.

The initial toolbox only fits the L frame; design adaptations for S and M are pending (user request for testers).

A 50T chainring may be too small; a 54T or larger is suggested for better efficiency and feel on flat courses. Users have successfully installed 58T, 60T, and 62T chainrings with SRAM Rival AXS 1x.

Yes, Velobuild can add threaded rivets for a bento box upon request when ordering.

Popular options include RideRever Triva brakes (often used with SRAM blips), SRAM S900 levers, and TRP TT brakes. TRP HD-T910 brakes fit bars with 22-24mm diameter and have been confirmed to work with the VB-TT-023.

Yes, the Winow HB052 aerobar can be mounted upside down to raise the bars, improving fit. This has been tested and works.

The thru axle should be M12x1.5, but the UDH is M12x1.0. Ensure the correct axle is used; stock axle may be incompatible. Also check that the UDH hanger screw is properly tightened.

The derailleur hanger on older frames (2024) may not be UDH; it looks like the one from VB268 road frame. Newer versions may have UDH, but compatibility with 13-speed SRAM is questionable.

Users have successfully used wheels from Elite Wheels, XMCarbonSpeed, Tagoola, and DFS. Popular choices include disc rear with 60-80mm front.

The Winow basebar is not sold separately. However, the BXT handlebar and TriRig Alpha One/Prime are compatible options, though fit may not be perfectly flush.

Yes, a 2x setup is possible, but most users choose 1x for simplicity and cost. The Ltwoo ERX TT groupset is an option but reliability is a concern.

Yes, a 58T chainring can be installed; users have successfully used 60T and 62T chainrings with SRAM Rival AXS 1x.

For TRP HD-T910 brakes, they fit bars with 22-24mm diameter; HD-T912 fit 24-25mm. Users have confirmed HD-T910 works with the VB-TT-023.

Extra spacers can be ordered from Velobuild or AliExpress. Velobuild charges $60 USD for 3 sets (35mm each); AliExpress sells 5, 10, 20, and 40mm spacers with 2 holes instead of 3.

FastTT extender plates can be used for more adjustability. Adjustable angle reach extenders also screw into the provided base plate.

Additional spacers are available from VeloBuild; users have printed custom spacers in PETG-CF or used longer bolts (M5) to raise the cockpit by 25-45 mm or more. The stock kit includes 5mm, 10mm, and 20mm spacers, and users have stacked up to 85mm or more by ordering extra spacers and longer bolts.

Use LEAP Components adapters (e.g., S900 grip shifter or 45-degree mounts) for a clean installation.

Solutions include using ample carbon assembly paste, ensuring proper torque (4-5 Nm), requesting a replacement (alloy) stem from Velobuild, or upgrading to an aftermarket stem/cockpit. The updated alloy stem reportedly solves handlebar flex issues and works well with carbon paste at 4 Nm.

Yes, Velobuild now offers an updated alloy stem which reportedly solves handlebar flex issues. Some users have had success with it, and it requires a C shim to prevent rubbing against the headtube when fully compressed.

The stock stem may require longer screws (10-12mm) for the front to better clamp the handlebars. Torque should still be 6 Nm, and carbon paste is recommended.

Yes, the basebar can be cut shorter. Insert the brake lever, measure, remove lever, and cut from the end. It is safe.

For the seatpost wedge, use carbon assembly paste inside the seat tube (not on the post) and torque to 6.5 Nm. This resolves slipping issues, though some users need up to 8 Nm as recommended by Velobuild support.

The expander plug should be installed very securely, and the top cap bolt tightened gradually to preload the headset without over-tightening. The stem clamp bolts should be loose during preload, then tightened after.

The seatpost may need to be torqued to 8 Nm to prevent slipping, as recommended by Velobuild after-sales support. However, using carbon paste inside the seat tube and torquing to 6.5 Nm often resolves slipping.

Some users have reported headset bearing sitting too high above the crown race, possibly due to excess resin or wrong parts. Check bearing and crown race fit; contact Velobuild for correct parts.

Check that you received the correct headset bearings; some users received two 42 ID IS52 bearings instead of different sizes. Replacement bearings can be sourced from ASOS or other suppliers.

Yes, the frame is now sold by Dolan Bikes as the 'TR2' and by Sunpeed as the 'Interstellar', though it is not confirmed if they are identical.