The OE tire sizes for the Kawasaki W230 (2024–present) are 90/90-18 front / 110/90-17 rear. Below are tires in these sizes, compared across brands. OE rim widths are F1.85 / R2.15 (from official specs; used for the rim-width check). OE sizes can differ by model year and market — the sidewall of your own bike is the sure reference. This is a Japanese-market lineup; the sizes themselves are international.
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Tires that cover front and rear (5 models)
Front + rear set: 5 models can cover both ends (matching sizes in bold, based on F=90/90-18 / R=110/90-17). Shop links search on the model name alone.
IRC describes the pattern as one that “suits classic and vintage machines,” with a sport compound giving “both wet performance and a solid feel.” IRC’s own fitment chart lists it front and rear for the W230.
Sizes: F 90/90-18, 90/100-18, 100/90-18, 100/90-19 / R 110/90-17, 130/80-17, 110/90-18, 130/70-18, 130/80-18
Where to buy
Dunlop describes “the traditional TT100 pattern, with modern technology poured in without restraint.” The obvious fit for classics like the W230. TL and WT split by size, so check before you buy.
Sizes: F 3.50-8, 110/90-17, 120/80-17, 3.00-18, 3.50-18, 4.00-18, 80/90-18, 90/90-18, 90/100-18, 110/90-18, 100/90-19, 100/90-18 / R 3.50-8, 110/90-17, 120/80-17, 3.00-18, 3.50-18, 4.00-18, 80/90-18, 90/90-18, 90/100-18, 110/90-18, 100/90-19, 130/80-18
Where to buy
Bridgestone’s line is “one item for a custom build — a pattern and a function that make riding a classic machine enjoyable.” Mostly 18- and 19-inch bias, and one of very few current road tires with a 110/90-17 rear.
Sizes: F 2.50-18, 3.50-18, 90/90-18, 3.50H19, 100/90-19 / R 110/90-17, 2.50-18, 4.00H18, 110/90-18, 130/80-18
Where to buy
The default bias tire for the 250 class. Dunlop credits “grip and long life from the latest compound.” A broad size range that covers most 17- to 19-inch naked bikes.
Sizes: F 100/90-16, 120/80-16, 70/90-17, 100/80-17, 110/70-17, 110/80-17, 120/70-17, 90/90-18, 100/80-18, 100/90-18, 110/90-18, 100/90-19 / R 130/90-16, 80/90-17, 120/80-17, 130/70-17, 130/90-17, 140/70-17, 150/70-17, 110/80-18, 110/90-18, 120/80-18, 120/90-18, 130/70-18, 130/80-18, 140/70-18, 150/70-18
Where to buy
The touring bias standard. Bridgestone’s line is “wet performance you can lean on — the definitive touring bias, further developed.” First choice if you ride in the rain.
Sizes: F 100/90-16, 110/90-16, 120/80-16, 100/80-17, 110/70-17, 110/80-17, 120/70-17, 90/90-18, 100/80-18, 100/90-18, 110/80-18, 110/90-18, 3.25-19, 100/90-19, 90/90-21 / R 130/90-16, 150/80-16, 120/80-17, 120/90-17, 130/70-17, 130/80-17, 130/90-17, 140/70-17, 140/80-17, 150/70-17, 4.00-18, 110/80-18, 110/90-18, 120/80-18, 120/90-18, 130/70-18, 130/80-18, 140/70-18, 150/70-18
Where to buy
Front 90/90-18 options (7 total, 5 of them listed in the set section above)
Size 90/90-18: 6 exact, 1 in the same group. Shop links carry each tire’s own matching size.
Michelin calls it “the new tire for classic bikes, with safety improved further.” It has both 100/90B19 and 130/70B18, so it updates a GB350 or GB350C front and rear without changing the classic look. Tubeless in every size (Michelin notes it can also go on a WT rim with a tube fitted).
Sizes: F 100/80B17, 110/70B17, 110/80B17, 90/90B18, 100/90-18, 110/80B18, 110/90B18, 100/90B19, 3.25B19 / R 130/70B17, 130/80B17, 130/90B17, 140/80B17, 150/70B17, 150/70R17, 120/90B18, 130/70B18, 130/80B18, 4.00B18
Where to buy
The British-born bias tire the TT100GP grew out of, for older machines. Inch sizes only, and the same sizes work front or rear. ★ Because the size range is identical at both ends, we list every size as both front and rear ★
Sizes: F 3.60-18, 4.10-18, 4.25/85-18, 3.60-19 / R 3.60-18, 4.10-18, 4.25/85-18, 3.60-19
Where to buy
Rear 110/90-17 options (9 total, 5 of them listed in the set section above)
Size 110/90-17: 3 exact, 6 in the same group. Shop links carry each tire’s own matching size.
Bridgestone calls it “a high-performance sport tire that shows its full fighting ability in production racing.” Mostly small 16- and 17-inch sizes, aimed at minibike racing. Bridgestone recommends it for “customers riding sport sessions or production races at the circuit.” There is no not-for-road marking.
Sizes: F 80/90-16, 80/90-17, 90/80-17, 100/80-17 / R 90/90-17, 100/80-17, 120/80-17
Where to buy
Dunlop cites “strong dry grip and aggressive handling.” The name that defines the high-grip bias tire, and it comes in MT-25 / Z250 sizes (110/70-17, 140/70-17).
Sizes: F 100/80-14, 80/90-16, 90/90-16, 100/90-16, 100/80-17, 110/80-17, 110/70-17 / R 120/80-14, 90/90-17, 90/80-17, 100/80-17, 120/80-17, 130/70-17, 140/70-17, 150/70-17, 90/90-18, 100/90-18, 120/80-18, 140/70-18, 150/70-18
Where to buy
Bridgestone calls it “the sport bias standard, with both sport and comfort.” The usual sport bias for the 250 class, balanced further toward touring than the TT900GP. Tubeless in every size.
Sizes: F 90/80-17, 100/80-17, 110/70-17, 110/80-17 / R 130/90-16, 120/70-17, 120/80-17, 130/70-17, 140/70-17, 140/70-18
Where to buy
IRC calls it “a modern road-going bias tire tuned for the quarter-litre class.” Unlike the RX-01 every size is tubeless, and it covers the MT-25 / Z250 sizes (110/70-17, 140/70-17).
Sizes: F 100/80-17, 110/70-17, 110/80-17, 120/70-17 / R 120/80-17, 130/70-17, 130/80-17, 140/70-17, 150/70-17, 140/70-18, 150/70-18
Where to buy
How to read this
- The 1–5 ratings are our own estimates. Not manufacturer figures, not measurements.
- Within one model, character and street legality both change with the size and the spec. Confirm with the manufacturer or a dealer before you buy.
- Shop links go to search results rather than product pages. Other sizes and older models will be mixed in.
- “Narrower” means one or two steps below the OE size. The “rim width OK” badge means the tire maker's published rim widths line up with the OE rim width; no badge means unconfirmed.
- Competition tires may not be used on public roads.