Chiru Endurance Bicycles

Vagus Titanium Endurance Gravel Bike with Shimano GRX

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  • Regular price $4,195.00

Built for Adventure

Designed for long days in the saddle, the Vagus has a compliance-oriented design and slightly more upright position to increase comfort and reduce fatigue.  A full compliment of bottle and luggage bosses on the frame and fork make it that much easier to carry everything that you might need.  The long front center and relaxed head tube angle help to keep the bike stable and confident on- and off-road, loaded or unencumbered.

With internal routing for mechanical or electronic drivetrains as well as stealth dropper posts, the Vagus can be tailored to your needs, preferences, and goals.  The future-proof T47 threaded bottom bracket is joined by 12x100mm and 12x142mm thru axles, and flat-mount brake bosses front and rear.  Designed with versatility in mind, the Vagus can accommodate 700c tires up to 43mm wide and 650B/27.5in tires up to 2.1in or 52mm wide.



  • Gravel endurance geometry
  • Seamless Grade 9 3Al/2.5V Titanium
  • Beautifully hand brushed finish with bead blasted graphics
  • Tapered head tube with four flush cable ports
  • T47 threaded bottom bracket
  • Top tube 'snack bag' mounts
  • Three sets of bottle bosses
  • Two sets of Anything Mounts on optional fork
  • Rear rack & fender mounts
  • Down tube mudguard mounts
  • Low-profile flat style disc brake mounts

**  Denotes special order option.  Subject to availability.


Size X-Small Small Meduim Large X-Large
Effective Top Tube Length 520mm 535mm 550mm 570mm 590mm
Head Tube Angle 70.25° 70.5° 71° 71.5° 72.5°
Seat Tube Angle 75° 74.25° 73.5° 73.25° 73°
Head Tube Length 120mm 135mm 160mm 180mm 200mm
Wheelbase 1020mm 1010mm 1013mm 1025mm 1045mm
Bottom Bracket Drop 71mm 70mm 70mm 70mm 68mm
Chainstay Length 428mm 430mm 430mm 433mm 433mm
Stack 535mm 554mm 580mm 600mm 622mm
Reach 370mm 379mm 385mm 390mm 400mm


Questions about gravel gearing?  Learn more here!

  Shimano GRX
GRX 2x11
Gear Range 382% 474%
Brake/Shift Levers Shimano GRX 810
Brakes Shimano GRX 810
Derailleur(s) Shimano GRX 810*
Shimano HG700
Shimano HG700
Chain Shimano HG701
Crankset Shimano GRX RX600
Shimano GRX RX600
Wheelset Shimano GRX RX570
Tubeless | 22mm inside width
Stem Whisky No. 7

Whisky No. 7
Carbon Fiber

Handlebar Whisky No. 7
12-Degree Flare
Tires Vittoria Terreno Dry 
700c X 38mm

* Subject to availability.  Derailleurs may be upgraded to Ultegra RX if GRX 810 is unavailable at time of build.


Do you offer custom builds on your frames?

Absolutely! Our stock builds are just where we feel like we can offer the best balance of price and performance. But we all have our fit, color, or brand preferences and we love tailoring bicycles to their new owners' needs. Contact us to learn more.

How do I buy one?

Well, you’re in the right place! We primarily sell J.Guillem frames direct to consumers. Part of that’s our location: not everyone is able to travel to New Mexico. We also know that not every shop can be expected to carry smaller brands- if you want something unique and special chances are it won’t be in stock around the corner.

We do love bike shops, though! If you are a bike shop or have one you’d like to work with on your build, please contact us and we’ll work hard to make it happen.

My size or option is out of stock!

Don't sweat! Drop us a line and we'll get what you're looking for or find an appropriate substitution. With the exception of wheels, most things are one to three days away.

How are bikes built and shipped?

We work with a local pro shop on all of our complete bike builds. They have loads of experience with frame-up builds and see even the rarest drivetrains and most niche parts on a regular basis. This way you can be confident that your bicycle will be built by a professional mechanic and test ridden before being packed and shipped via FedEx.

How long will it take?

Because each build is tailored to you, in-stock sizes and options take two to four business days to build.  As soon as your order is placed we'll reach out with a ship date.

Do you have a warranty?

Every Chiru Endurance Bicycles frame is built to provide performance that lasts and is backed by a lifetime warranty against defects in materials and workmanship.