2018 Caterham Seven 420R/620R
The 2018 Caterham Seven 420R/620R tire size and wheel specifications below reflect standard OEM reference fitment data for this trim level.
Detailed tire and wheel breakdown for the 2018 Caterham Seven
Tire geometry â 195/45R15
The 195/45R15 fitted to the 2018 Caterham Seven has a section width of 195mm and an aspect ratio of 45%, mounted on a 15-inch rim. That gives a sidewall height of 87.8mm (3.45") and an overall outside diameter of 556.5mm (21.91"). At highway speed this tire completes roughly 572 revolutions per kilometre, which is what your speedometer and odometer are calibrated against.
Plus-sizing window
If you want to upsize wheels on the 2018 Caterham Seven while keeping the speedometer accurate, target a 205/37R16 (plus-one). For a softer ride or winter setup, a 185/54R14 (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 2018 Caterham Seven uses a 4x108 bolt pattern with a 63.4mm hub bore. Safe rim width range for the OEM tire is 6.0J â 7.0J, and offsets in the ET19 â ET29 window will clear suspension and fender without rubbing on most setups.
Staggered setup notes
The 2018 Caterham Seven ships staggered: 195/45R15 up front and 245/40R15 on the rear. That is a 245mm vs 195mm 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 2018 Caterham Seven 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) |
|---|---|---|---|
| 420R/620R | 195/45R15 Rear: 245/40R15 | 15" x 6.5 | ET24 |
Frequently Asked Questions
What tire size does the 2018 Caterham Seven 420R/620R use?
The 2018 Caterham Seven 420R/620R uses 195/45R15 tires as standard equipment.
What is the bolt pattern of the 2018 Caterham Seven 420R/620R?
The 2018 Caterham Seven 420R/620R has a 4x108 bolt pattern with a center bore of 63.4mm.
What is the wheel offset of the 2018 Caterham Seven 420R/620R?
The 2018 Caterham Seven 420R/620R has a wheel offset of ETET24.