450 EXC-F / 450 EXC-F SIX DAYS tires

The OE tire sizes for the KTM 450 EXC-F / 450 EXC-F SIX DAYS (2025–26) are 90/90-21 front / 140/80-18 rear. Below are tires in these sizes, compared across brands. OE rim widths for this bike are not on file, so no rim-width badges appear. 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.

Original equipment tires and recommended pressure

Off-road tire pressure (1.0 bar). Converted from the owner's manual bar values. Per the 2026 owner's manual for 450/500 EXC-F (standard models). SIX DAYS: Metzeler 6D-Extreme.

May differ by model year, market or batch. Pressures are cold values. Always check the label on the bike and the owner's manual. Sources (manufacturer): [1]

→ Open this bike in the chart (filter and sort there)

Tires that cover front and rear (48 models)

Front + rear set: 48 models can cover both ends (matching sizes in bold, based on F=90/90-21 / R=140/80-18). Shop links search on the model name alone. “Narrower” means one or two steps below the OE size. “Rim width OK” means the tire maker’s published rim widths line up with the OE rim width. No badge means we could not confirm it; combinations we found to be wrong are left out entirely.

Front 90/90-21 options (83 total, 48 of them listed in the set section above)

Size 90/90-21: 34 exact, 44 in the same group, 5 narrower. 5 with no size data on file are out of scope. Shop links carry each tire’s own matching size. “Narrower” means one or two steps below the OE size. “Rim width OK” means the tire maker’s published rim widths line up with the OE rim width. No badge means we could not confirm it; combinations we found to be wrong are left out entirely.

Rear 140/80-18 options (60 total, 48 of them listed in the set section above)

Size 140/80-18: 27 exact, 2 in the same group, 31 narrower. 5 with no size data on file are out of scope. Shop links carry each tire’s own matching size. “Narrower” means one or two steps below the OE size. “Rim width OK” means the tire maker’s published rim widths line up with the OE rim width. No badge means we could not confirm it; combinations we found to be wrong are left out entirely.

See also

Bikes with the same OE sizes, front and rear

• KTM 125 ENDURO R / 390 ENDURO R
• KTM 125 XC-W / 250 XC-W / 300 EXC / 300 EXC SIX DAYS (formerly XC-W TPI)
• KTM 250 EXC-F / 250 EXC-F SIX DAYS
• KTM 350 EXC-F / 350 EXC-F SIX DAYS
• KTM 390 ADVENTURE R
• KTM 450 RALLY REPLICA
• KTM 500 EXC-F / 500 EXC-F SIX DAYS
• KTM 690 ENDURO R
• KTM 690 RALLY
• Ducati Desmo450 EDS
• Triumph TF 250-E / TF 450-E

• All KTM models (OE sizes)
• Find forest roads: Forest road map of Japan (location and length, in Japanese)

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.