Wide-track Defender conversions compared: Obsidian, Buzz SV, Urban
Obsidian, Buzz SV, Urban and others all widen a Defender’s arches. What actually differs, and what to check whoever did it.
What they have in common
All wide-track conversions do the same fundamental thing: push the wheels further out, then cover them. The width comes from spacers or revised hubs; the coverage comes from bonded or bolted arch extensions.
The visual effect is dramatic and it is the main reason people buy them. A wide-track Defender looks planted in a way the standard car does not.
Obsidian
Widely seen on commercial Defenders, including their OCTA Widetrak treatment on 110s. Consistent finish, arches painted to body colour, wheel and tyre packages chosen to fill the arches properly. Most of our stock carries their work.
Buzz SV
Comparable conversion, typically specified as a complete vehicle rather than a kit — often bundled with air suspension, tow pack and climate options. If you want the whole car handled by one converter, this is the shape of that.
Urban Automotive
Well-known in this space, offering arch kits supply-only or fitted. Common on privately converted cars, which means quality depends on who did the fitting rather than on Urban themselves.
What actually matters when comparing
- Arch coverage. The tyre tread must be fully covered. This is law, not taste. Marginal coverage is a fail waiting to happen.
- Geometry reset. Widening the track changes scrub radius and bearing loads. A conversion that was bolted on without setting up the geometry will wear tyres unevenly.
- Paint match. Arches painted separately can weather differently. Look along the panel in daylight.
- Documentation. A written specification of parts and fitter, for insurance and resale.
- Warranty. Understand what the converter covers and what the manufacturer still covers.
Does it hurt anything?
Slightly. Wider track adds unsprung weight and marginally increases tyre wear. Fuel consumption changes negligibly. On a vehicle this size the dynamic penalty is small, and stability improves.
Insurance
Declare it. Every time. A professionally fitted, documented conversion is routinely accepted and priced normally. An undeclared one is a reason to decline a claim.
