Halcyon makes handbuilt steel bicycle frames in a small shop on Feeder Road, Bristol. Three models. Made to your measurements. Forty-eight frames a year and not one more.
Halcyon is one builder, Tom Yiannakis, in a 600-square-foot workshop on Feeder Road. Tom learnt the trade as an apprentice at Mercian Cycles in 2008 and went on his own in 2011. He has built every frame to leave the shop — 412 of them, at the time of writing.
Three models. A road frame (the Halcyon Strato), a road-plus / light gravel frame (the Marlock), and a randonneuring frame with rack and dynamo provision (the Stalwart). All in Reynolds 853 main triangles with lugged, fillet-brazed, or TIG-welded construction depending on the customer's preference.
The deliberate pace is the point. We measure you, draw you, build you, and the frame turns up at your door roughly twelve months later. We are slow on purpose. We don't apologise for it.
Each frame is built to your measurements and your stated use. Colour, finish, and componentry are yours; geometry is ours.
A road frame in the classic British sense. Reynolds 853 main triangles, 631 stays, polished stainless dropouts, your choice of lug pattern or smooth fillet brazing. For long days on tarmac.
A versatile, all-road frame with clearance for a 40 mm tyre, flat-mount disc brakes, and slightly slacker geometry than the Strato. Built to take a small front roll without complaint.
A purpose-built randonneuring frame with low-trail front geometry, integrated rack mounts, dynamo cable routing, and provision for full mudguards. For people who genuinely do ride through the night.
Twelve months from deposit to delivery, in five stages. We update you with photographs at every stage.
Two hours in the shop. We measure, talk through use, ride a couple of fit-bikes, and decide on the model.
A full geometry drawing is sent for your approval. We will not start the steel until you say go.
Mitre, tack, braze or weld. The slowest step. The frame sits on the jig for roughly four weeks.
Painted by Maldon Shot Blasters in Essex. Six weeks. Your choice of colour, from any RAL or BS code.
Come to Bristol. We build the frame up if you want, or send the frameset by courier. First ride is on us.
These are the centre-stack geometries. Yours will vary based on the fitting. The numbers below are real frames built in the last three years, used here as a guide.
| Spec | Strato 54 | Strato 56 | Marlock 56 | Stalwart 58 |
|---|---|---|---|---|
| Top tube (eff.) | 548 | 567 | 572 | 582 |
| Seat tube C-T | 540 | 560 | 560 | 580 |
| Head tube | 140 | 165 | 175 | 195 |
| Head angle | 73.2° | 73.2° | 72.0° | 71.0° |
| Seat angle | 73.5° | 73.0° | 73.0° | 72.5° |
| Chainstay | 410 | 410 | 425 | 440 |
| BB drop | 72 | 72 | 74 | 76 |
| Fork rake | 45 | 45 | 50 | 62 |
| Trail | 59 | 59 | 58 | 34 |
| Wheelbase | 988 | 1008 | 1024 | 1062 |
| Stack | 553 | 578 | 590 | 610 |
| Reach | 378 | 391 | 388 | 394 |
We accept twenty-four new orders in March and twenty-four in September. The next opening is at 10am on Wednesday, 2 September 2026. The list opens by email — a refundable £500 deposit holds your slot.
If you'd like to be notified when the list opens, write to us at the email below — there's no formal sign-up; we just keep a list of names.
Email Tom →