Ducati 049 Build: Part 5 – Swingarm Sorted & Titanium Shims

If you caught Part 3 of the build, you’ll know we were up to our elbows in sprockets, spindles, and slightly wishful thinking as we chased the dream of shoehorning a Ducati style single-sider into a Cagiva chassis. Well, you’ll be glad to know – it’s in. And it looks absolutely spot on.

Strip, Blast, Paint – and a Clean Bill of Health

Once we got our hands on the donor swingarm (Aprilia), first job was to strip it right back. Hub dismantled, bearings checked (they were fine – we’ll take a win when we get one), and everything cleaned down ready for the next phase.

A bit of nervousness surrounded the blasting stage – there’s always that “what if?” as the years of grime disappear and the raw metal is revealed. But happily, the arm’s in cracking nick. A few marks here and there, but nothing structural. So after a fresh round of shot blasting, it went straight into paint. The finish is factory-fresh, satin black and gives the whole assembly a new lease of life.

Custom Sprockets & Minimal Clearances

We’ve fitted a brand-new rear sprocket, custom ordered to suit the mix of Aprilia hub and Cagiva drive – the joys of franken-biking. It’s running true and clears nicely. There’s something deeply satisfying about seeing it spin freely on the bench, knowing how many moving parts had to agree to get there.

A Swingarm Made to Fit (Almost)

Here’s the real triumph – the swingarm now sits sweetly in the Cagiva frame. No reamers, no foul language, no midnight cutting sessions – just a shim on each side. And not just any shim.

We whipped up a pair of 0.5mm spacers from aircraft-grade titanium, courtesy of a mate who works in aerospace and is now fully invested in this build. As he put it, “If it’s good enough for the Eurofighter, it’ll probably survive a Sunday blast to Goodwood.”

It’s the little touches like that which make this project feel special – not just a parts-bin bike, but a proper enthusiast-built machine where every component has a story.

Reassembly Time

With the shims in place, the swingarm dropped into position with barely a whisper. Axle slid in snug, everything torqued up nice and square. There’s still a fair bit to go on this rear end – brake carrier, chain line setup, the lot – but seeing the wheel back in mocked up was a real milestone. It’s starting to look like a bike again, and the stance is exactly what we hoped for: planted, purposeful, and unmistakably Ducati.

Next up, we’ll be tackling the rear brake assembly, checking chain alignment, and starting to plan out the suspension setup. More fettling, more fettucine (it is a Ducati after all), and probably more odd jobs than we’re expecting.

Stick around – there’s plenty more bodges, biscuits and brilliant moments to come.