Good Frame, Dead Part
Bicycles age in a lopsided way: the frame lasts decades, but the small machined parts bolted to it are model-specific and vanish from catalogues within a few years. A snapped derailleur hanger on a frame the maker stopped supporting. An axle nut with a thread nobody has stocked since the nineties. The clamp half of a discontinued seatpost. Forums end these threads the same way every time: "you'll have to get one made."
That's this page. EKINSUN machines custom bicycle replacement parts from the worn or broken original — measured, redrawn free of charge, and cut in aluminium, stainless, steel or titanium — one piece at a time, quoted within 24 hours.
This is the bicycle corner of our replacement parts service; motorised two-wheelers live at motorcycle replacement parts.
Worth Machining vs. Just Buy It
We'll be straight with you — most bike parts should simply be bought. Machining earns its cost only where the catalogue has abandoned you:
| Part | Honest answer |
|---|---|
| Chain, cassette, tubes, pads, cables, spokes | Buy them — consumables, standardised, cheap |
| Derailleur hanger, current frame | Buy it from the frame maker while they still list it |
| Derailleur hanger, unsupported frame | Machine it — frame-specific, and without it the frame is scrap |
| Vintage axle nuts, spacers, odd-thread hardware | Machine it — decades out of production |
| Seatpost / clamp / rack & fender fittings sold only as assemblies | Machine it — the maker never sold the piece you broke |
| Lightweight one-off upgrades (Ti bolts, alloy spacers) | Machine it if the size you want isn't sold |
Parts We Machine for Bicycles
Derailleur hangers
Frame-specific hangers reproduced from the bent or snapped original — 6061/7075 alloy, or stainless.
Axle hardware
Nuts, spacers and adjusters for older hub standards and odd threads no shop stocks.
Seatpost & clamp parts
Clamp halves, wedges and bolts for discontinued posts and frames.
Rack & fender fittings
Brackets, standoffs and threaded bosses for mounting points that no longer exist.
Vintage restoration
Period hardware measured from the original and machined in a matching or better material.
Small custom upgrades
Titanium bolts, alloy spacers and one-off fittings in the exact size the catalogue skips.
The Derailleur Hanger Problem
The hanger deserves its own paragraph because it strands more good frames than any other part. It's designed to bend or break to save the frame — and it's unique to the frame model. Makers rotate designs constantly and drop old ones; aftermarket databases cover hundreds of shapes but not all, and not forever. When yours isn't in any of them, send us the broken hanger. The frame interface — the dropout face, bolt holes and pivot bore — survives most breaks, and we measure those unbroken features, rebuild the geometry, and machine a new hanger. If you ride somewhere remote, order two.
Bent, snapped, or half missing — still send it. We reconstruct from what remains, plus photos of the dropout. See how we copy from a sample and obsolete & discontinued parts.
Materials
6061 / 7075 aluminium
The native material of hangers, spacers and clamps — light, machinable, anodised to match.
7075 machining →Titanium Grade 5
Small bolts and fittings where grams count and corrosion never wins.
Titanium machining →From Broken Part to New Part
Send what's left
The broken part in the post, or photos with a caliper on the key features — plus the frame or hub interface if it's a fit-critical piece.
We rebuild the drawing
Geometry reconstructed from the unbroken features, threads gauged, drawing sent for your approval — free. No CAD needed →
Machine and ship worldwide
Cut, finished (anodised if you want), checked against the drawing, shipped to your door.
What to Send for a Fast Quote
- The part — bent, snapped or worn — or photos with one measurement for scale
- Bike make, model and year if you know them
- For hangers: photos of the dropout with the hanger removed
- Material preference — match the original, or upgrade
- Quantity (a spare is cheap once the drawing exists) and delivery country
Frequently Asked Questions
Yes — this is the classic case. Hangers are frame-specific, makers drop them after a few years, and a snapped hanger can strand an otherwise good frame. Send the old hanger (bent is fine — we measure the unbent features and the frame interface) and we machine a replacement in 6061 or 7075, or stainless if you prefer.
Consumables — chains, cassettes, tubes, pads, cables — are catalogue items; buy them. Machining pays off for frame- or model-specific parts that are discontinued: hangers, axle hardware for older standards, seatpost clamp pieces, rack fittings, and any small bracket never sold separately.
Yes. Vintage restoration constantly hits odd thread standards and hardware out of production for decades. Send the original — worn or broken — and we measure it, rebuild the drawing free, and machine it in a period-appropriate or better material.
Yes — titanium Grade 5 for small bolts, spacers and fittings where weight and corrosion both matter. Aluminium, stainless and steel are also available; we recommend based on load and location.
Yes. Most of these orders start exactly there. Post the part, or send photos with a caliper reading, and we rebuild the geometry, confirm the drawing with you, then machine it. One piece is a normal order.
Get a Bicycle Part Quoted
The broken part and your bike model — that's enough to start. Engineers reply in 24h.
// Qty & price
1 pc
Sample price
Get riding again
2–5
Spares cheap
Drawing already done
10+
Best price
Shops & restorers
- →No distributor — you pay the maker directly
- →CAD saved after first order — reorder anytime at lower unit price