2008 Cadillac SRX Wheel Interchange

2008 Cadillac SRX Wheel Fitment Guide | wheelinterchange.com

Known OEM Fitment For 2008 Cadillac SRX

The values below are documented examples for the 2008 Cadillac SRX. This may be a partial list. Cadillac offered multiple wheel and tire packages by trim and option. If your vehicle differs, use the door-jamb tire placard, the owner’s manual, or an OEM parts catalog as your primary source, then verify with the on-page calculator.

Notes:

• The 20 x 8.0 ET50 wheel and the 235/65R17 tire reflect different factory packages. They did not ship together. Your SRX may have 17, 18, or 20 inch factory equipment depending on trim. Confirm your baseline on the door placard or by VIN.
• If you plan to change wheel size or offset, use the calculator on this page to compare geometry and clearances before you buy.

How To Use The Wheel Interchange Calculator

The calculator lets you compare a donor wheel and tire to your SRX. It also lets you simulate custom rim and tire sizes. Follow these steps:

• Step 1. Set Installed on (your vehicle) to 2008 Cadillac SRX. This loads the known chassis specs like bolt pattern 6x115 and hub bore 70.1 mm.
• Step 2. Enter your current factory setup as the baseline if known. Use the door placard or your OEM wheel and tire sizes. If unsure, you can start from the documented examples above.
• Step 3. Under Wheels from (donor vehicle), enter the wheel size and offset you want to test. If you are cross-shopping another vehicle’s wheels, enter that donor vehicle’s specs.
• Step 4. Use Custom wheel size to try different rim width and offset. The tool shows inner and outer clearance changes relative to your baseline.
• Step 5. Use Custom tire size to set section width and aspect ratio. When you change rim diameter, the calculator updates tire diameter in the comparison so you can keep overall diameter within a safe range.
• Step 6. Review the outputs: inner clearance to suspension, outer poke to the fender, change in scrub radius tendency, and tire diameter difference. Aim to keep overall tire diameter within about 3 percent of OEM unless you are recalibrating systems.
• Step 7. If the donor wheel has a larger center bore than 70.1 mm, plan for hub-centric rings. If the bore is smaller than 70.1 mm, that wheel will not fit without machining, which is not recommended.

Fitment Checklist Before You Buy

• Bolt pattern must match 6x115. Do not attempt 6x114.3. It is not compatible.
• Center bore must seat on 70.1 mm. If the wheel bore is larger, use quality hub-centric rings sized to 70.1 mm at the hub.
• Thread size is M12 x 1.5. Verify lug nut seat type that your wheels require. Do not mix conical, ball, or mag-seat hardware.
• Wheel width and offset. Start from the documented ET 50 example for an 8.0 inch rim. Use the calculator to evaluate inner clearance to struts and knuckles, and outer poke to fender trim.
• Brake caliper clearance. Check spoke design and barrel clearance. Not all 17–20 inch aftermarket wheels clear the SRX brakes, even if diameter matches.
• Load rating. Ensure wheel and tire load indexes meet or exceed the SRX’s GAWR and placard requirements.
• Tire overall diameter. Keep close to your OEM baseline. Large changes affect speedometer accuracy, ABS, and transmission shift points.
• TPMS compatibility. Reuse and service your sensors or purchase compatible new sensors. Verify frequency and protocol by VIN or OEM catalog.
• Spacers. Only if necessary to clear brakes or suspension, and only hub-centric with adequate stud engagement. Recalculate effective offset in the calculator.
• Torque specification. Use the torque value in your owner’s manual or service information. Do not guess. Re-torque after 50–100 miles.

Plus Sizing And Common Upgrades

Plus sizing changes rim diameter while keeping overall tire diameter close to stock. The SRX was offered with different factory packages, including 17 inch tires on some trims and an example 20 x 8.0 ET50 wheel on others. If you plan to move up or down in size, follow these guidelines:

• Use your specific factory size as the baseline. Confirm from the door placard or OEM documentation.
• Keep overall tire diameter within about 3 percent of the baseline to protect drivability and system calibrations.
• As rim width grows, offset often needs to decrease to maintain inner clearance. Use the calculator to see inner clearance and outer poke changes.
• Verify brake and fender clearance at full lock and full compression. Inspect both front and rear.
• Match or exceed the factory load index and speed rating on tires.

Installation Tips

• Test fit first. Spin each front wheel by hand to confirm barrel and spoke clearance to calipers.
• Clean the hub face and the wheel mounting pad. Remove rust and debris. A thin film of high-temp anti-seize on the hub pilot can help future removal, but keep it off studs and lug seats.
• Use hub-centric rings if the wheel bore is larger than 70.1 mm. Seat the ring fully.
• Mount tires with the correct rotation and inside-outside orientation as marked.
• Hand start all lug nuts. Tighten in a star pattern. Final torque with a calibrated torque wrench to the OEM spec from your manual.
• Avoid lubricating wheel studs or lug seats. Dry torque unless the service manual says otherwise.
• Initialize or relearn TPMS as required. Replace TPMS service kits when transferring sensors.
• Road test and re-check torque and clearances after 50–100 miles.

Tools And Helpful Supplies

• 1/2 inch drive torque wrench
• M12x1.5 lug nuts or bolts matched to your wheel seat type
• Hub-centric rings 70.1 mm at the hub side
• TPMS service kit for GM sensors

FAQs

• What is the 2008 Cadillac SRX bolt pattern?

  6x115. That is six studs on a 115 mm circle.

• Is 6x114.3 compatible with 6x115?

  No. Do not use 6x114.3 on a 6x115 hub. The mismatch can cause vibration, broken studs, and loss of clamping force.

• What is the center bore for the SRX?

  70.1 mm. If your wheel’s bore is larger, use hub-centric rings. If it is smaller, the wheel will not fit.

• What OEM wheel and tire sizes did the SRX use?

  This model year had multiple packages. Documented examples include a 20 x 8.0 ET50 wheel and a 235/65R17 tire, which were from different trims. Confirm your exact factory size from the door placard or OEM catalog, then use the calculator to compare changes.

• What is the lug nut thread size?

  M12 x 1.5. Match the lug seat style to your wheel design.

• What offset works with wider aftermarket wheels?

  Offset depends on wheel width and brake clearance. Start from the known ET50 for an 8.0 inch rim and use the calculator to keep inner clearance safe while avoiding excessive poke. Verify physically before driving.

• Do I need spacers for aftermarket wheels?

  Only if necessary for clearance. Use hub-centric spacers and ensure proper stud engagement. Spacers change effective offset, so simulate them in the calculator.

• What is the correct lug torque?

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

• Will my TPMS work with new wheels?

  Yes if you transfer compatible sensors or install new compatible units. Verify sensor frequency and part number by VIN or an OEM parts source, then perform the TPMS relearn.