IRC GS-19: sizes and matching bikes
Type: Classic ／ Street legal
About this tire
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.
Across the six axes, Wet sits at 4 and Dry・Life・Warm-up・Comfort・Sport at 3. The six numbers land close together: an even set-up. Of the 7 tires in the Classic group, 1 carry 4 for Wet. 4 front sizes and 5 rear, mostly 18-inch.
Our rating (1–5)
| Dry | 3 / 5 |
|---|---|
| Wet | 4 / 5 |
| Life | 3 / 5 |
| Warm-up | 3 / 5 |
| Comfort | 3 / 5 |
| Sport | 3 / 5 |
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.
Size lineup
Front
- 90/90-18
- 90/100-18
- 100/90-18
- 100/90-19
Rear
- 110/90-17
- 130/80-17
- 110/90-18
- 130/70-18
- 130/80-18
Bikes whose OE sizes it fits
Of the 260 bikes on file, this tire’s size lineup fits the OE sizes of 14. Each link opens the tires you can pick for that bike.
| Model | Years | Front | Rear |
|---|---|---|---|
| BMW R 12 | 2024–present | 100/90R19 | 150/80R16 |
| Kawasaki MEGURO K3 | 2026 model | 100/90-19 | 130/80-18 |
| Kawasaki MEGURO S1 | 2026 model | 90/90-18 | 110/90-17 |
| Kawasaki W230 | 2024–present | 90/90-18 | 110/90-17 |
| Kawasaki W800 | 2026 model | 100/90-19 | 130/80-18 |
| Ducati Scrambler Icon / Dark / Nightshift / Full Throttle | 2023–present | 110/80R18 | 180/55R17 |
| Triumph Bonneville T100 | current as of Aug 2026, UK spec | 100/90-18 | 150/70R17 |
| Triumph Bonneville T120 | current as of Aug 2026 | 100/90-18 | 150/70R17 |
| Triumph Scrambler 400 X | 2024–present | 100/90-19 | 140/80-17 |
| Triumph Scrambler 900 | current as of Aug 2026 | 100/90-19 | 150/70R17 |
| Triumph Speed Twin 900 | current as of Aug 2026 | 100/90-18 | 150/70R17 |
| Honda GB350 | 2021–present | 100/90-19 | 130/70-18 |
| Honda GB350C | 2024–present | 100/90-19 | 130/70-18 |
| Honda GB350S | 2021–present | 100/90-19 | 150/70R17 |
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.