The Short Version
- The S660 is 4×100 with a 56 mm hub bore. Honda’s own Q&A page and two Japanese wheel databases agree on the pattern, the bore and every size below.
- The front is 15×5J at +45 on a 165/55R15 tyre. The rear is 16×6.5J at +50 on a 195/45R16. Diameter, width, offset and tyre are all different front to rear.
- So a set of four identical wheels is wrong for this car. Wheels for the S660 come as two pairs, and a front wheel will not work on the rear or the other way round.
A Mid-Engine Kei Car on Two Different Wheel Sizes
Honda released the S660 on 2 April 2015 as a kei-class open sports car with a mid-mounted engine and rear-wheel drive. Honda’s own history page lists the model as ending in March 2022.
The different front and rear sizes are the thing buyers miss. One Japanese wheel specialist explains them by the mid-engine layout, which puts more weight on the rear. The Honda pages we read do not give a reason, so we only report the sizes.
Factory Specification
| Position | Wheel | Offset | Tyre | PCD / Holes / Bore | Weight (Honda) |
|---|---|---|---|---|---|
| Front | 15×5J | +45 | 165/55R15 75V | 100 / 4 / 56 | about 6.4 kg |
| Rear | 16×6.5J | +50 | 195/45R16 80W | 100 / 4 / 56 | about 7.6 kg |
The figures are from Honda’s Q&A page for the S660 (JW5), which is written for the model as of its January 2020 update and covers the α and β grades. We also opened the DBA-JW5 α page on two Japanese wheel databases, Spec Tank and Cars Japan, which list the same sizes for the 2015–2018 cars. Spec Tank also lists the same sizes for the 2021 3BA-JW5 Modulo X Ver.Z. The tyre sizes and speed ratings (75V front, 80W rear) are Honda’s.
What This Means When Shopping
4×100 is the pattern our EK9 guide gives for the ordinary EG6 and EK4 Civic SiR, and our Copen guide covers another small 4×100 car. Use the S660 figures, not the pattern alone, when you compare listings: a wheel can match the pattern and still be the wrong width or offset.
Read the size line of every listing. A set described as “15×5J +45, four wheels” fits the front only. A true S660 set is two 15-inch wheels and two 16-inch wheels, and the car is one of the staggered cars covered in our staggered-fitment reference. The Honda Beat is another kei car that is staggered from the factory.
The 56 mm bore matters when you buy aftermarket. A wheel with a larger centre bore needs hub-centric rings to centre on the hub, and our hub bore guide shows how to measure it yourself.
Sizing
Rim width differs by 1.5 inches and offset by 5 mm between the axles on the factory wheels, so any replacement set will normally be staggered too. We have not measured clearance for any aftermarket size on the S660, so we do not recommend a size here. Tyre rotation between front and rear is also not possible on the standard sizes, because the diameters and widths differ.
Importing
The S660 went on sale in April 2015. In the US, the 25-year import exemption (49 CFR 591.5(i)) applies to a vehicle that is 25 or more years old, counted from the date of manufacture. On that reading no S660 can qualify before 2040, and we have not verified the month the first cars were built. We did not check the import rules of other countries for this guide.
What We Could Not Verify
- The material of the front wheel. Honda’s Q&A table lists the front as a 15-inch steel wheel and the rear as a 16-inch aluminium wheel. A Nextage buyer’s guide describes the S660 wheels as aluminium, and one owner’s weighing note calls the front wheel aluminium. We could not reconcile these, so we state no material.
- Whether the sizes differ on any special edition. Honda lists a 660-unit Concept Edition at launch; we did not check its wheels.
- The hub bore to a tenth of a millimetre. Honda and both databases print 56 mm.
- The wheel-nut seat type. None of the sources we read state it.
- Real-world clearance of any aftermarket wheel, and whether the spec changed between the 2015 and 2020 cars beyond what the databases list.
Looking for a specific set? We specialise in genuine Japanese wheels — RAYS, Volk, Enkei, SSR, WORK, BBS Japan and the rare discontinued sets that never left the country. Tell us the wheel, the fitment, the year — our team searches our networks until we find it.
Related Guides
- Staggered From the Factory: The JDM Cars Where a Matching Set of Four Is Wrong
- Honda Beat Wheel Fitment Guide (PP1): It Is Staggered From the Factory
- Daihatsu Copen Wheel Fitment Guide (L880K / LA400K)
- Honda CR-X & CR-X del Sol Wheel Fitment Guide
- Hub Bore: The Number Nobody Publishes, and How to Measure It Yourself