Mostly, wheel stud 15mm spacers are considered to be safer. They are bolted to the vehicle studs with the provided lug nuts. Then the wheels are attached to the new wheel studs with the OEM lug nuts. This ensures each lug nut has a safe thread engagement. Two sets of wheel studs create a strong wheel connection that is firm enough to support the weight of the vehicle. You don’t need to replace the studs. With proper torque settings, you should not experience any sort of vibration.

If you want the wheels to sit flush with the fenders, with no rubbing issues, you should choose wheel spacers with proper thickness and offset. Most bigger wheels or brake calipers will need 15mm spacers to clear rubbing issues. Most successful cases show that as long as you operate properly, they are exactly safe.

Are Wheel Stud 15mm Spacers Safe BONOSS Forged Grade 12.9 High Strength Wheel Studs (3)

Are Wheel Stud 15mm Spacers Safe BONOSS Forged Grade 12.9 High Strength Wheel Studs

What Wheel Stud 15mm Spacers Are Good?

If you’ve ever spent time looking at the heads of studs that are pressed in the wheel spacers, you’ve probably noticed that there are different head shapes. The shapes can be semi-circular, elliptical, or round. Generally, wheel studs with semi-circular or elliptical heads are found on most cheap casting 15mm spacers. The material of cheap spacer is not dense enough and is relatively soft. When under high temperature and stress, the studs will loosen and spin if they cannot be fastened. This causes safety issues. That is why most cheap casting 15mm spacers often use semi-circular or oval-shaped bolts to prevent loosening.

Brands that focus on quality and performance are very strict in raw materials and manufacturing processes. BONOSS 15mm spacers are made of high-strength 6061-T6 and 7075-T6 aluminum alloy materials. After continuous tons of pressure, the forging process eliminates internal voids/gas pockets that weaken metal parts, maximizing fatigue resistance and increasing impact strength. So, the wheel studs of BONOSS wheel spacers are whole round heads. They are firmly pressed in the 15mm spacers. You don’t need to worry about any loosen issues.

Are Wheel Stud 15mm Spacers Safe BONOSS Forged Grade 12.9 High Strength Wheel Studs (2)

Do I Need to Cut Wheel Studs for 15mm Spacers?

Sometimes 15mm spacers are not thick enough to cover the vehicle studs. The protruding OEM studs may cause the wheel not to sit flush against the hub flange. In this case, wide wheel pockets are necessary. Take a look at the inside of your wheels and make sure the mounting plate has pockets machines into it and isn’t solid. Then measure the cavity in your wheels to check out how much it will allow for the stud to go past the spacer outer surface.

Simply speaking, if the pockets of your wheels are deep enough for your studs, you don’t have to cut any studs. The wheel pockets depth + spacer thick ≥ stud length, then the wheel spacers will fit properly. Giving an example, if the depth of the wheel pocket is 15mm, and the OEM stud length is 26mm, then installing 15mm spacers will perfectly fit (15+15 ≥ 26). If the wheel pocket doesn’t fit along, changing to thicker wheel spacers is a good solution.