ブリヂストン MOTOCROSS M203 / M204: sizes and matching bikes
Type: Motocross ／ Competition only
About this tire
Bridgestone files it for “intermediate to soft surfaces (MEDIUM to SOFT)” and marks it ■ not for public roads. ★ Only one size survives on the official site, the 100/100-18 rear ★ The M203 is directional — check the arrow when fitting.
Across the six axes, Mud sits at 4 and Pavement at 1. A tire set up to be good at some things and to give up others. Of the 19 tires in the Motocross group, 6 carry 4 for Mud. One size, 18-inch.
Our rating (1–5)
| Sand | 3 / 5 |
|---|---|
| Mud | 4 / 5 |
| Rocks | 2 / 5 |
| Hard-pack | 2 / 5 |
| Pavement | 1 / 5 |
| Life | 2 / 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
Rear
- 100/100-18
Bikes whose OE sizes it fits
Of the 260 bikes on file, this tire’s size lineup fits the OE sizes of 1. Each link opens the tires you can pick for that bike.
| Model | Years | Front | Rear |
|---|---|---|---|
| Kawasaki KLX230R / R S | 2027 model | 80/100-21 | 100/100-18 |
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.