2025 BAC Mono 2.3L Cosworth / 2.5L Mountune
The 2025 BAC Mono 2.3L Cosworth / 2.5L Mountune tire size and wheel specifications below reflect standard OEM reference fitment data for this trim level.
Detailed tire and wheel breakdown for the 2025 BAC Mono
Tire geometry â 205/40R17
The 205/40R17 fitted to the 2025 BAC Mono has a section width of 205mm and an aspect ratio of 40%, mounted on a 17-inch rim. That gives a sidewall height of 82.0mm (3.23") and an overall outside diameter of 595.8mm (23.46"). At highway speed this tire completes roughly 534 revolutions per kilometre, which is what your speedometer and odometer are calibrated against.
Plus-sizing window
If you want to upsize wheels on the 2025 BAC Mono while keeping the speedometer accurate, target a 215/32R18 (plus-one). For a softer ride or winter setup, a 195/49R16 (minus-one) keeps the overall diameter within Âą3% of stock, which is the industry tolerance for ABS and stability control to stay calibrated.
Wheel fitment specs
The 2025 BAC Mono uses a 4x108 bolt pattern with a 63.4mm hub bore. Safe rim width range for the OEM tire is 7.0J â 8.0J, and offsets in the ET25 â ET35 window will clear suspension and fender without rubbing on most setups.
Staggered setup notes
The 2025 BAC Mono ships staggered: 205/40R17 up front and 245/40R17 on the rear. That is a 245mm vs 205mm width difference â do not rotate front-to-rear, and replace tires in axle pairs to keep ABS and traction control balanced.
Tire pressure guidance
Manufacturer-recommended cold tire pressure for the 2025 BAC Mono is printed on the driver-side door jamb sticker â always defer to that value, not to the maximum pressure printed on the tire sidewall. Check pressure monthly and before long trips; under-inflation by 20% can reduce tread life by 25%.
Fitment Specifications
| Engine & Trim | Tire Size | Rim Size | Offset (ET) |
|---|---|---|---|
| 2.3L Cosworth / 2.5L Mountune | 205/40R17 Rear: 245/40R17 | 17" x 7.5 | ET30 |
Frequently Asked Questions
What tire size does the 2025 BAC Mono 2.3L Cosworth / 2.5L Mountune use?
The 2025 BAC Mono 2.3L Cosworth / 2.5L Mountune uses 205/40R17 tires as standard equipment.
What is the bolt pattern of the 2025 BAC Mono 2.3L Cosworth / 2.5L Mountune?
The 2025 BAC Mono 2.3L Cosworth / 2.5L Mountune has a 4x108 bolt pattern with a center bore of 63.4mm.
What is the wheel offset of the 2025 BAC Mono 2.3L Cosworth / 2.5L Mountune?
The 2025 BAC Mono 2.3L Cosworth / 2.5L Mountune has a wheel offset of ETET30.