2013 Cadillac CTS Wheel Interchange

2013 Cadillac CTS Wheel Interchange And Fitment Guide

Known OEM Fitment For 2013 Cadillac CTS

The data below reflects known factory specifications for at least one 2013 CTS configuration. Cadillac offered multiple trims, brakes, and wheel packages in 2013, so some values can vary by trim. Always confirm what your specific car left the factory with using your door placard, build sheet, or the on-page calculator comparison against your current setup.

Notes:

• The presence of both an 18x8 ET48 wheel and a 235/55R17 tire in the known data indicates more than one OEM configuration existed in 2013. Your car may differ.
• To verify your exact OEM size, use the tire and loading sticker on the driver door jamb or your VIN build sheet. If your door placard lists a different size, follow the placard.

How To Use The Wheel Interchange Calculator

The calculator on this page lets you compare a donor wheel and tire to your 2013 CTS, then fine tune custom wheel and tire sizes. It updates tire diameter automatically when you change rim diameter.

• Select Wheels from (donor vehicle). Enter the donor rim diameter, rim width, and offset, plus its tire size if known.
• Select Installed on (your vehicle). Choose 2013 Cadillac CTS, then enter your current wheel and tire size if it differs from the known values above.
• Use Custom wheel size to adjust rim diameter, width, and offset. The tool shows inner clearance to the strut and outer poke toward the fender as you change values.
• Use Custom tire size to enter section width and aspect ratio. The calculator updates total tire diameter and speedometer change.
• Aim to keep overall tire diameter within about plus or minus 3 percent of your verified OEM size to maintain speedometer accuracy and ABS behavior. Keep inner clearance safe for struts, liners, and brake hoses. Verify outer clearance under full steering and suspension compression.
• Before buying, test your final numbers against your actual car by measuring brake caliper clearance and doing a physical test fit when possible.

Fitment Checklist Before You Buy

• Bolt pattern: Must be 5x120.
• Center bore: Hub on the car is 67.0 mm. If an aftermarket wheel has a larger bore, use hub-centric rings sized to 67.0 mm at the hub side. Do not use a wheel with a smaller bore.
• Fasteners: Thread is M14 x 1.5. Verify the correct lug nut or bolt seat type for your wheels and ensure proper thread engagement. Do not mix ball and conical seats.
• Offset and width: Known OEM example is 18x8 ET48 with 5.89 in backspacing. If you change width, adjust offset to maintain safe inner and outer clearance. Example: increasing width by 0.5 in adds about 6.35 mm per side. Reducing offset by about 6 mm keeps inner clearance similar. Use the calculator to verify.
• Brake clearance: Confirm spoke and barrel clearance over your calipers and rotors. Big brake or performance packages may require specific wheel shapes even if the diameter fits.
• Load rating: Wheels and tires must meet or exceed the CTS axle and GVWR load requirements.
• Tire overall diameter: Stay close to your OEM diameter. Large deviations affect speedometer, gearing, and ABS. The calculator shows error percentage.
• TPMS: Match sensor type and frequency to your car and perform relearn per the service manual or scan tool instructions.
• Spacers or adapters: Only if necessary, and only hub-centric with proper hardware and thread engagement. Recalculate offset and clearances.
• OEM confirmation: If anything is unclear, confirm via the door placard, the factory service manual, or a dealer parts lookup by VIN.

Plus Sizing And Common Upgrades

Plus sizing changes wheel diameter while keeping total tire diameter close to stock. The examples below are for illustration only. Use the calculator and verify clearances on your actual car.

• From 235/55R17 baseline (about 26.2 in diameter):
  • 18 inch example: 245/45R18 is about 26.7 in. About 2 percent larger. Check fender clearance and speedometer error.
  • 19 inch example: 245/40R19 is about 26.7 in. Also about 2 percent larger. Verify brake and fender clearance.
• If moving from 8.0 in to 8.5 in wheel width, consider reducing offset roughly 6 mm to keep inner clearance similar, then confirm with the calculator.
• Wider tires can improve grip but may increase tramlining and rolling resistance. Ensure sufficient clearance at full lock and full compression.
• Staggered setups can affect rotation patterns and traction balance. Confirm electronic stability calibration and clearance before use.

Installation Tips

• Test fit every wheel on the car before mounting tires when possible. Verify hub fit, brake clearance, and lug seat contact.
• Clean the hub and wheel mounting pad. Remove rust and debris. Do not paint thick coatings on mating faces.
• If using hub-centric rings, seat them fully on the wheel and ensure the wheel sits flat on the hub.
• Hand start all fasteners. Tighten in a star pattern. Use the factory torque specification from the owner manual or service information. Do not lubricate threads or seats unless the OEM procedure specifies it.
• After driving 50 to 100 miles, recheck torque on all fasteners.
• Perform TPMS relearn after rotation or wheel replacement as required by the vehicle procedures.
• Check for rubbing by turning lock to lock and driving over a speed bump while listening for contact. Inspect inner liners and brake hose clearance.

Tools And Helpful Supplies

• 1/2 inch torque wrench: Search on Amazon
• Wheel hanger guide pin M14 x 1.5 for easier mounting: Search on Amazon
• Accurate tire pressure gauge or inflator: Search on Amazon
• Digital caliper for measuring hub and wheel bores: Search on Amazon

FAQs

• What is the bolt pattern on a 2013 Cadillac CTS?

  5x120.

• What center bore does the 2013 CTS use?

  67.0 mm. If your wheel’s center bore is larger, use hub-centric rings to 67.0 mm. Do not use a wheel with a smaller bore.

• What is the lug thread size?

  M14 x 1.5. Verify the correct seat type for your wheels and ensure proper thread engagement.

• What offset do I need?

  A known OEM configuration is ET48 on an 18x8 wheel. The correct offset for your setup depends on wheel width, brake clearance, and fender clearance. Use the calculator to compare inner and outer clearances to your current wheels and aim to keep inner clearance safe while avoiding poke.

• Can I run 19 inch or 20 inch wheels?

  Possibly, depending on offset, width, tire size, and brake clearance on your specific CTS trim. Keep overall tire diameter close to stock, verify clearance with the calculator, and test fit before mounting tires.

• What tire size came stock?

  It varies by trim. One known OEM tire size is 235/55R17 and one known wheel setup is 18x8 ET48. Check your door placard or build sheet to confirm what your specific car used.

• Do I need new lug nuts or bolts?

  You need fasteners that match M14 x 1.5 and the wheel’s seat type. Many aftermarket wheels require different seat styles than OEM. Match length and seat type precisely and use quality hardware.

• What is the correct torque spec?

  Refer to the Cadillac owner’s manual or factory service information for the exact torque. Do not guess. Re-torque after 50 to 100 miles.

• Will spacers work on a CTS?

  Use only hub-centric spacers with proper hardware and adequate thread engagement. Recalculate effective offset and verify brake and fender clearance. Spacers can increase bearing load, so use the minimum thickness required.