That's a smart move. The Detroit is the spiritual reference, but the Omera needs its own visual identity. A seat tube cutout is a strong signature — instantly recognizable and signals "this is a track-bred frame" without copying Dosnoventa's exact look.
| Feature | Detroit | Omera |
|---|---|---|
| Seat tube | Standard round | Cutout wrapping rear wheel ✅ |
| Down tube | Columbus Airplane ovalized | 50mm round (battery inside) |
| Drive | Chain | Gates CDX belt (visible difference) |
| Brakes | None (track) or rim | Hydraulic disc |
| Rear dropout | 120mm track | 135mm horizontal/sliding |
| Motor | None | Bafang G020 (stealth hub) |
The cutout + belt drive + disc brakes together give the Omera a completely different silhouette from the Detroit while keeping the same aggressive 74°/76° pursuit geometry. Someone who knows bikes would clock it immediately as its own thing. ppl-ai-file-upload.s3.amazonaws
One thing to flag for the frame builder — the Omera has 135mm rear spacing (not 120mm track), so the seat tube cutout needs to be wider than a typical track frame cutout. The wheel sits in the same plane but the hub flanges and disc rotor are wider. Make sure the cutout clears:
- Tire (700×25c) + 3mm each side minimum
- Disc rotor on the non-drive side
- Belt on the drive side
This is doable but the frame builder needs to know upfront. Want me to add this to the frame fabrication brief?
Yes — there are proven, buyable “frame split” solutions you can design around instead of inventing your own from scratch.
What Gates Requires
Gates explicitly says the frame must have a “frame break” in the rear triangle so the one‑piece belt can be slipped in. mi-tech
They don’t care where, as long as:
You’re already planning horizontal/sliding dropouts, so you just need the frame split.
Off‑the‑shelf frame split hardware
You can buy CNC’d metal splitters and design your stays around them:
Paragon Machine Works belt splitters
Dropout‑integrated split (Tout Terrain / Olsen style)
Custom seat‑stay splitter services (Bike Knack, Ti Cycles)
Veer split belt (no frame split)
What makes sense for Omera
Given your goals (stealth, clean BB, CNC dropouts, 135 mm belt hub + disc):
Use a dropout‑integrated split on the right side, like the Olsen RocknRollout / Tout Terrain pattern. olsenbicycles
Keep no cuts in the seat stay or chainstay tubes themselves — all the complexity is in a replaceable dropout block.
So the answer: yes, you can absolutely base your design on existing hardware. Look at Paragon’s belt‑drive splitters and the RocknRollout/Tout Terrain split dropout concepts as references, then have your own 135 mm disc‑compatible CNC dropout machined around a similar interface. bikeforums
Would you like me to sketch a right‑side dropout concept (135 mm, flat‑mount disc, belt split) you can hand to a machinist?