When it comes to thicker wheel spacers, you’ll see two main types: bolt-on and slip-on. Both widen your track and improve stance, but they’re designed for different applications. Choosing the right type depends on your spacer thickness and hardware setup.
Slip-On Spacers Explained
Slip-on spacers slide directly onto the hub, with the wheel then mounted over them using longer wheel bolts or studs.
They’re lightweight, simple to install, and ideal for smaller to medium thicknesses — typically up to 20mm per side. Beyond this, the bolt engagement into the hub becomes too short for safe clamping, even with extended bolts.
That’s where bolt-on spacers become essential.
Bolt-On Spacers Explained
Bolt-on spacers attach directly to the hub using their own internal bolts or nuts. The wheel then mounts to a second set of studs or threaded holes built into the spacer itself, effectively creating an extended hub face.
This setup is perfect for thicker fitments — 25mm and above — as it maintains full thread engagement and strength without overextending your wheel bolts.
Strength and Safety
Because bolt-on spacers have their own integrated hardware, they’re ideal for wider setups where slip-on spacers would compromise safety.
All Killer Offset, Demon, and Bimecc bolt-on spacers are CNC machined from 6061-T6 aluminium, ensuring perfect balance, hub centric alignment, and long-term durability. Installed correctly, they’re as secure as the factory hub.
Hub Centric Fitment Still Matters
Whether slip-on or bolt-on, hub centric design is non-negotiable. It keeps your wheel perfectly centred, eliminates vibration, and prevents stress on bolts or studs. Every Killer Offset, Demon, and Bimecc spacer from Stanced UK is fully hub centric for flawless alignment and safety.
Which Type Should You Choose?
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Up to 20mm: Use slip-on spacers with extended wheel bolts.
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25mm and above: Use bolt-on spacers for full thread engagement and safety.
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Mixed setups: Some cars run slip-ons at the front and bolt-ons at the rear to achieve the perfect stance balance.
The Bottom Line
For 20mm spacers and under, slip-on designs are perfectly safe with the correct hardware. Once you move to 25mm or thicker, bolt-on spacers are the right choice — maintaining strength, balance, and hub centric security for wider track setups.
✅ Shop bolt-on and slip-on hub centric spacers from Killer Offset, Demon, and Bimecc at Stanced UK – engineered for stance, clearance, and confidence.
