OEM wheel and tire fitment specs for the 2008 Cadillac CTS, including bolt pattern (PCD), center bore diameter, thread size, rim diameter, rim width, wheel offset, and backspacing.
Recorded OEM specifications for the 2008 Cadillac CTS, donor years with overlapping ranges, and a calculator to compare a selected wheel. Range overlap is not a guaranteed fit.
Multiple OEM configurations exist for this vehicle. Fitment can vary by trim, brakes, and factory wheel package – confirm your exact setup before buying.
Center-bore records disagree: year-level hub 67 mm vs trim range 66.9–66.9 mm. Interchange below does not treat this as an unqualified match.
Thread-only product links are shopping examples, not verified fits. Seat style is not confirmed here. As an Amazon Associate we earn from qualifying purchases.
Donor vehicles with overlapping OEM specs
These are vehicle-year records whose recorded OEM ranges overlap this 2008 Cadillac CTS. Overlap is not a guarantee that a specific wheel will install. Selected-wheel comparison is in the calculator below.
Evaluated 46 donor years. Listed 24 eligible overlaps (not all evaluated years are compatible). Showing all listed.
Check wheel configurationCheck lug hardware: donor year M12x1.5 vs 2008 Cadillac CTS M14x1.5
Bolt pattern5x120 · Same recorded PCD
Center bore70.3 mm donor vs hub 66.9 mm
Wheel geometryOEM width/offset ranges overlap (not a specific wheel)
Recorded vehicle-side thread for the 2008 Cadillac CTS is M14x1.5. This donor year is recorded as M12x1.5. That is the vehicle stud/nut thread, not an intrinsic thread stamped on the wheel. Hardware must match this vehicle’s studs and the selected wheel’s seat and engagement. Existing hardware may be reusable if it already matches. Seat style is not in this dataset, so products are not a verified fit.
Dataset suggestionHub-centric rings ≈ 70.3 → 66.9 mm – not a verified installation requirement.
Hub-centric rings of about 70.3 → 66.9 mm mm may be relevant if the wheel bore is larger than the hub; they cannot enlarge a smaller bore. Recorded vehicle-side thread differs (M12x1.5 on the donor year vs M14x1.5 on the target vehicle). Hardware must match the target vehicle’s studs and the selected wheel’s seat. Existing hardware may be reusable if it already matches. Seat style is not confirmed in this dataset.
Wheel geometryOEM width/offset ranges overlap (not a specific wheel)
Center-bore records disagree (target year-level hub 67 mm vs trim range 66.9–66.9 mm; donor year-level hub 67 mm vs trim range 66.9–66.9 mm). Unqualified overlap is not claimed until the conflict is resolved.
Donor width/offset sits outside the known OEM envelope for this vehicle. Precomputed data suggested a spacer; geometry was re-checked against OEM envelope.
Check wheel configurationCenter-bore records disagree
Bolt pattern5x120 · Same recorded PCD
Center bore66.9 mm · same recorded hub figure
Wheel geometryNeeds configuration check
Donor width/offset sits outside the known OEM envelope for this vehicle. Precomputed data suggested a spacer; geometry was re-checked against OEM envelope.
Donor width/offset sits outside the known OEM envelope for this vehicle. Precomputed data suggested a spacer; geometry was re-checked against OEM envelope.
Check wheel configurationCenter-bore records disagree
Bolt pattern5x120 · Same recorded PCD
Center bore66.9 mm · same recorded hub figure
Wheel geometryNeeds configuration check
Donor width/offset sits outside the known OEM envelope for this vehicle. Precomputed data suggested a spacer; geometry was re-checked against OEM envelope.
Donor width/offset sits outside the known OEM envelope for this vehicle. Precomputed data suggested a spacer; geometry was re-checked against OEM envelope.
Donor width/offset sits outside the known OEM envelope for this vehicle. Precomputed data suggested a spacer; geometry was re-checked against OEM envelope.
Cadillac CTS Years With Compatible Wheels
Only years with evidence-based interchange relationships are listed. Adjacent years are not assumed compatible.
Compare a donor vehicle or custom wheel against this 2008 Cadillac CTS. Use Compare in calculator on a donor row above to fill the donor side of this same calculator.
Compare
Compare wheel compatibility between two vehicles
Wheels from (donor vehicle)
Selected Car:
Custom wheel size (optional)
Tip: change values here to simulate custom wheels and immediately see the impact in the comparison below.
Custom tire size (optional)
Installed on (your vehicle)
Selected Car:
2008 Cadillac CTS
Compare Rims
Specification
Wheels from
Installed on
Result (Click it)
Bolt Pattern
The total number of bolt holes and the diameter of the circle they form.
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5x120
Center Bore
The hole in the center of the wheel that fits over the vehicle’s hub.
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66.9 mm
Thread Size
The size and spacing of the threads on the bolts or nuts that hold the wheel in place.
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M14 x 1.5
Rim Diameter
The wheel diameter in inches that determines which tire sizes will fit.
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17"
Rim Width
The distance between the inner edges of the wheel is measured in inches.
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8.0"
Wheel Offset
How far the wheel sits inward or outward relative to the hub mounting surface.
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48 mm
Backspacing
Shows how much space the wheel takes up toward the inside of the vehicle.
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-
Wheel Fasteners
The type of hardware used to secure the wheel to the vehicle.
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-
Compare Tires
Specification
Wheels from
Installed on
Result (Click it)
Section Width
The width of the tire from sidewall to sidewall, measured in millimeters.
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Aspect Ratio
The height of the tire’s sidewall expressed as a percentage of its width.
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Diameter
The wheel diameter for which the tire is designed to fit.
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Tire Pressure
The recommended air pressure for safe and efficient driving.
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Overall Diameter
The total height of the tire and wheel combined affects clearance and speedometer accuracy.
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-
Wheel Fitment Parts for the 2008 Cadillac CTS
Example products matched to recorded thread, hub, or spacer dimensions. They are not verified fits. Confirm seat style, thickness, and clearance before ordering.
As an Amazon Associate we earn from qualifying purchases. Product availability and pricing may change.
2008 Cadillac CTS Wheel Fitment Guide
Known OEM Fitment For 2008 Cadillac CTS
The values below are verified for at least one factory wheel and tire package on the 2008 Cadillac CTS. This model year had multiple OEM wheel and tire options, so your specific trim may differ. Always confirm against your door jamb sticker, owner manual, or a GM dealer using your VIN, and validate changes with the on-page calculator.
Bolt pattern
5x120
Center bore
67.0 mm
Thread size
M14 x 1.5
Known OEM wheel
18 x 8.0, ET 48, backspacing 5.89 in
Known OEM tire
235/55R17
Notes:
The 18 x 8.0 ET 48 wheel and the 235/55R17 tire indicate that multiple factory packages existed. Do not assume they were paired together. Verify what your CTS left the factory with before planning changes.
The 235/55R17 tire has an overall diameter of about 27.2 in. Some trims may use a different size. Use the calculator to compare overall diameter against your current tire and aim to keep changes small for accurate speedometer and ABS behavior.
How To Use The Wheel Interchange Calculator
The calculator on this page lets you compare a donor wheel and tire to your 2008 Cadillac CTS, and also try custom sizes. Follow these steps:
Set Installed on to 2008 Cadillac CTS.
Option A - Comparing a known wheel: Select Wheels from for the donor vehicle or enter its rim width, diameter, and offset. Enter the donor tire size if known.
Option B - Trying a custom setup: Use Custom wheel size to set rim diameter, width, and offset. Use Custom tire size to set section width and aspect ratio. When you change rim diameter, the calculator updates overall tire diameter so you can see the effect.
Review the comparison and pay attention to inner clearance to the strut and brakes, and outer poke relative to the fender. Keep overall tire diameter changes small to protect drivability and electronics.
If anything is unknown or varies by trim, measure your current wheel and tire and confirm clearances with a careful test fit before driving.
Fitment Checklist Before You Buy
Bolt pattern must be 5x120. Do not attempt to use 5x120.65 or 5x4.75 in patterns.
Center bore is 67.0 mm on the hub. If an aftermarket wheel has a larger bore, use hub centric rings that reduce to 67.0 mm.
Offset target is the documented ET 48 for a known OEM 18 x 8.0 wheel. Stay close to this and use the calculator to check both inner clearance and fender poke when changing width or diameter.
Backspacing for the known 18 x 8.0 ET 48 wheel is 5.89 in. If you only know backspacing on a candidate wheel, convert to offset to compare properly.
Brake and suspension clearance must be verified. Larger diameter wheels may clear brakes more easily, but wider wheels or lower offsets can reduce inner clearance. Test fit and rotate the wheel lock to lock.
Tire overall diameter should stay close to your stock setup. A small variance is generally recommended. Use the calculator to compare.
TPMS: Plan to transfer your sensors or install compatible replacements and perform the relearn per the owner manual or GM service procedures.
Load rating: Wheels and tires must meet or exceed the vehicle load rating. Check manufacturer specs.
Lug hardware: Use the correct M14 x 1.5 lug nuts with the seat style that matches your wheel. Ensure full thread engagement as specified by GM.
Plus Sizing And Common Upgrades
Plus sizing changes wheel diameter and tire profile while keeping overall tire diameter similar to stock for proper speedometer and ABS behavior. The 2008 CTS was available with different OEM packages, including 17 and 18 inch configurations. Use the calculator to:
Keep overall tire diameter close to your current setup. Enter your existing size, then try a potential upgrade and compare overall diameter.
Check offset impact when increasing wheel width. A wider wheel with the same offset will move the inner barrel closer to suspension. Adjust offset carefully and verify with the calculator.
Decide between a square setup for tire rotation or a staggered setup for appearance and traction. If you stagger, confirm that both front and rear clear properly.
For winter packages, downsizing in diameter can be useful if brake clearance allows. Confirm brake clearance and overall diameter, then choose an appropriate winter tire width and aspect ratio.
Installation Tips
Clean the hub face and wheel mounting pad to remove rust and debris. This prevents runout and vibration.
If using hub centric rings, seat them fully on the hub and ensure they match the wheel bore and 67.0 mm hub size.
Hand start all M14 x 1.5 lug nuts, then snug in a star pattern. Final tighten with a calibrated torque wrench to the torque specified in your owner manual or GM service information.
Re-torque after 50 to 100 miles of driving.
Verify TPMS operation and perform the relearn after installation.
After test fitting, turn the steering wheel lock to lock and check for rubbing at full compression. Inspect inner clearance to struts, control arms, and brake hoses.
Will wheels from another 5x120 GM or non-GM vehicle fit my 2008 CTS
Not automatically. You must match bolt pattern, center bore 67.0 mm or use rings, offset, brake clearance, and load rating. Use the calculator to compare width, offset, and tire size, then perform a physical test fit.
Can I use 5x120.65 or 5x4.75 in wheels on the CTS
No. The 2008 CTS is 5x120. Mixing patterns can damage studs and hubs and is unsafe.
What offset should I choose for aftermarket wheels
The documented OEM 18 x 8.0 wheel uses ET 48. Stay close to that and verify inner and outer clearances with the calculator when changing width or diameter. Always test fit before driving.
Do I need hub centric rings
Use rings if the aftermarket wheel center bore is larger than 67.0 mm. Rings help the wheel center on the hub to reduce vibration. They do not replace proper lug tightening.
Can I reuse my TPMS sensors
Yes, you can transfer your existing sensors to new wheels if they are compatible with the wheel design. Otherwise use compatible replacements and complete the TPMS relearn per the owner manual or GM procedures.
How close should my new tire diameter be to stock
Keep overall diameter changes small to maintain speedometer, ABS, and traction control behavior. Use the calculator to compare your current size to the new size. The listed 235/55R17 is about 27.2 in diameter, but other OEM sizes may exist for this model year.
Will 17 inch wheels clear my brakes
Some 2008 CTS trims came with 17 inch tires, but brake sizes can vary. Verify with the calculator and a test fit to ensure caliper clearance on your specific trim.
What is backspacing and why does it matter
Backspacing is the distance from the wheel mounting pad to the inner rim edge. It affects inner clearance to suspension and brakes. The known OEM 18 x 8.0 ET 48 wheel has 5.89 in backspacing. Compare any candidate wheel against this using the calculator.
Methodology and sources
Wheel interchange depends on more than bolt pattern. Where data is available, this site compares recorded OEM values:
Bolt pattern / PCD
Center bore direction (donor wheel bore must not be smaller than the hub)
Wheel diameter, width, and offset against known OEM ranges
A normal wheel spacer does not change bolt pattern. Hub rings cannot enlarge a wheel bore that is smaller than the hub. Brake clearance and tire package fitment still require vehicle-specific checks when not confirmed in the dataset.
