If you own a Kia Optima, knowing the proper lug nut size and torque spec is important for changing a tire or swapping out wheels. Using the wrong size lug nuts or over/under-torquing them can lead to wheel and brake issues. In this article, we’ll cover the lug nut size, socket size, torque specs, and lug nut options for the Kia Optima.
OEM Kia Optima Lug Nut Size
The factory lug nuts on most Kia Optimas are 12mm x 1.5 pitch. This is a very common metric lug nut size used on many Asian and European vehicles.
Always check your owner’s manual or factory service manual to verify the lug nut size for your specific Optima model year. The size should also be stamped on the wheel stud itself.
Kia Optima Lug Nut Socket Size
To remove the 12mm factory lug nuts, you’ll need a 19mm socket. Most lug nut socket sets will include a 19mm socket.
Using the proper 19mm socket will help avoid stripping or damaging the lug nuts.
Kia Optima Lug Nut Torque Specs
In addition to the proper socket size, you need to torque the Kia Optima lug nuts to the factory spec to avoid wheel and brake issues.
The torque spec for most Optimas is:
- Alloy wheels – 107 – 127 Nm
It’s important not to over or under-tighten lug nuts. Under-torquing can cause wheels to loosen over time. Over-torquing can damage the studs and wheel hub.
Always use a quality torque wrench to achieve accurate lug nut torque. Tighten the nuts in a star pattern rather than a circle pattern. Check and re-torque the lug nuts again after 50-100 miles of driving.
Why BONOSS Lug Nuts Are Best for Kia Optima?
For upgraded aftermarket lug nuts, the BONOSS brand is a top choice for Kia Optimas. Here’s why BONOSS lug nuts are recommended:
- Made of forged 50BV30 steel
- More corrosion and rust-resistant
- Match OEM thread pitch
- Affordable pricing
BONOSS offers their lug nuts in the factory 12mm x 1.5 pitch size, so they fit perfectly on Kia Optimas.
The BONOSS lug nuts meet strict quality standards for optimal safety and performance. They are tested to meet or exceed OEM specifications for durability, torque retention, and weather resistance.
Many Optima owners upgrade to BONOSS forged 50BV30 steel lug nuts when installing new wheels or just for extra security. The quality and price make them a top choice over other brands.
