CAD-modeled rear conversion
The custom subframe and monoshock conversion were modeled before fabrication so shock position, upper mounts, and tail structure could be evaluated as one system.
Build Log
A 1981 Honda CX500 reinterpreted as a neo-retro, endurance-inspired cafe racer: oldschool longitudinal V-twin character, modern sportbike geometry, custom 17-inch spoked wheels, CAD and ANSYS-backed monoshock chassis work, and a clean Motogadget ecosystem.
0.199 mm
ANSYS Max Deflection
160 MPa
Peak Stress Check
1.56
Minimum Safety Factor
17 in
Custom Spoked Wheels
Progress
The project is moving from documented engineering and frame work into coating, assembly, systems packaging, and first-fire checks.
The 1981 CX500 donor, import paperwork, parts references, and build notes were gathered before the project moved from old bike to full reinterpretation.
Rear chassis and monoshock conversion modeled in CAD, then checked in ANSYS with documented stress, deformation, and safety-factor outputs.
Frame, engine, and drivetrain separated. The rear section was opened up for the custom subframe, gussets, shock mounts, and compact Motogadget wiring layout.
Coated chassis parts, custom 17-inch spoked wheels, KTM Duke 390 radiator packaging, and electronics are being staged before final assembly.
Engineering
This is not a restoration of the original CX500. It is a performance-minded reinterpretation with CAD layout, static structural analysis, fabricated reinforcement, modern suspension geometry, and a road-and-track stance.
The custom subframe and monoshock conversion were modeled before fabrication so shock position, upper mounts, and tail structure could be evaluated as one system.
Static structural outputs give the build a paper trail: 160 MPa peak equivalent stress, 0.199 mm max deformation, and a 1.56 minimum safety factor.
The frame work is reinforced with formed plates and careful welds around the load path instead of treating the rear section as a simple visual hoop.
Workbench
A tighter view of what is happening on the bench right now: fabrication, Motogadget wiring, geometry, and finishing decisions.
ANSYS static structural review documented a 160 MPa peak equivalent stress, 0.199 mm total deformation, and a 1.56 minimum safety factor for the rear conversion concept.
Report: Nov 2024
The custom rear frame uses welded reinforcement around the shock and seat support area so the cafe tail is structural, not just cosmetic.
Process: TIG + fit-up
Suzuki GSX-R750 K7 USD forks, a Cognito Moto triple tree, 30 mm offset, and custom 17-inch spoked wheels push the CX platform toward a modern endurance stance.
Direction: road + Grobnik
Setup
The current parts map, grouped by system so the build reads clearly on desktop and phone.
Garage Blog
Longer CX500 build notes now live in the blog, while this page stays as the main project overview.
May 6, 2026 · 4 min read
A 1981 Honda CX500 is being reinterpreted into a neo-retro endurance cafe racer with modern geometry, custom 17-inch spoked wheels, and a clean Motogadget control system.
Read note
May 6, 2026 · 5 min read
The rear of the CX500 is being rebuilt with a custom subframe, YSS shock, welded reinforcement, CAD layout, and ANSYS static checks before final assembly.
Read noteMedia
Build photos with enough context to make the progress easy to follow.
Contact
Want to collaborate, sponsor parts, or schedule a shoot of the finished build? Reach out and let's make it happen.