IRC JX8 GEKKOTA: sizes and matching bikes
Type: Enduro ／ Competition only
About this tire
IRC says it was “developed for endurocross and hard enduro.” A dual compound stiffens the sidewall for higher speeds and fewer punctures. Not street legal (IRC’s own statement).
Across the six axes, Rocks sits at 5 and Pavement at 1. A tire set up to be good at some things and to give up others. Of the 33 tires in the Enduro group, 7 carry 5 for Rocks. 2 sizes, mostly 18-inch.
Our rating (1–5)
| Sand | 3 / 5 |
|---|---|
| Mud | 4 / 5 |
| Rocks | 5 / 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
- 110/100-18
- 140/80-18
Bikes whose OE sizes it fits
Of the 260 bikes on file, this tire’s size lineup fits the OE sizes of 28. Each link opens the tires you can pick for that bike.
| Model | Years | Front | Rear |
|---|---|---|---|
| KTM 125 ENDURO R / 390 ENDURO R | 2025 model | 90/90R21 | 140/80R18 |
| KTM 125 XC / 250 XC / 300 XC / 250 XC-F / 350 XC-F / 450 XC-F | 2020–26 | 80/100-21 | 110/100-18 |
| KTM 125 XC-W / 250 XC-W / 300 EXC / 300 EXC SIX DAYS (formerly XC-W TPI) | 2026 model | 90/90-21 | 140/80-18 |
| KTM 150 EXC TPI / 150 XC-W | 2020–26 | 80/100-21 | 110/100-18 |
| KTM 250 EXC TPI | 2020–22 | 80/100-21 | 140/80-18 |
| KTM 250 EXC-F | 2020 model | 80/100-21 | 140/80-18 |
| KTM 250 EXC-F / 250 EXC-F SIX DAYS | 2025–26 | 90/90-21 | 140/80-18 |
| KTM 300 EXC TPI | 2020 model | 80/100-21 | 140/80-18 |
| KTM 300 XC-W / 300 XC-W HARDENDURO | 2027 model | 80/100-21 | 110/100-18 |
| KTM 350 EXC-F | 2020 model | 80/100-21 | 140/80-18 |
| KTM 350 EXC-F / 350 EXC-F SIX DAYS | 2025–26 | 90/90-21 | 140/80-18 |
| KTM 390 ADVENTURE R | 2025 model | 90/90-21 | 140/80-18 |
| KTM 450 EXC-F | 2020 model | 80/100-21 | 140/80-18 |
| KTM 450 EXC-F / 450 EXC-F SIX DAYS | 2025–26 | 90/90-21 | 140/80-18 |
| KTM 450 RALLY REPLICA | 2027 model | 90/90-21 | 140/80-18 |
| KTM 500 EXC-F | 2020 model | 80/100-21 | 140/80-18 |
| KTM 500 EXC-F / 500 EXC-F SIX DAYS | 2025 model | 90/90-21 | 140/80-18 |
| KTM 690 ENDURO R | 2026 model | 90/90-21 | 140/80-18 |
| KTM 690 RALLY | 2026–present | 90/90-21 | 140/80-18 |
| Kawasaki KX250FX | 2027 model | 80/100-21 | 110/100-18 |
| Ducati Desmo450 EDS | current as of Oct 2026 | 90/90-21 | 140/80-18 |
| Triumph TF 250-E / TF 450-E | current as of Aug 2026 | 90/90-21 | 140/80-18 |
| Honda CRF250RX | 2020 model | 80/100-21 | 110/100-18 |
| Honda CRF250RX (2027 model) | 2027 model | 90/90-21 | 110/100-18 |
| Honda CRF450X | 2027 model | 80/100-21 | 110/100-18 |
| Yamaha WR250F | 2027 model | 80/100-21 | 110/100-18 |
| Yamaha YZ125X / YZ250X | 2022–present | 80/100-21 | 110/100-18 |
| Yamaha YZ250FX | 2019–present | 80/100-21 | 110/100-18 |
See also
Other Enduro tires (32)
Tires in the same group, to compare ratings and size lineups.
- IRC iX-09W GEKKOTA
- IRC M5B EVO
- IRC VE-33s GEKKOTA
- IRC VE-35 / VE-33
- Vee Rubber VRM-211 / 211B
- Vee Rubber VRM-271
- Vee Rubber VRM-272
- Vee Rubber VRM-298
- Vee Rubber VRM-303R
- Vee Rubber VRM-307
- Vee Rubber VRM-340
- Vee Rubber VRM-354
- Shinko 216MX
- Dunlop GEOMAX AT81EX
- Dunlop GEOMAX AT82
- Dunlop GEOMAX EN92
- Dunlop GEOMAX ENDURO EN91
- Dunlop GEOMAX ENDURO EN91EX
- Pirelli MT 21 RALLYCROSS
- Pirelli SCORPION XC MID HARD
- Pirelli SCORPION XC MID SOFT
- Bridgestone BATTLECROSS E50
- Bridgestone BATTLECROSS E50 Extreme
- Maxxis MaxxCross EN (M7313 / M7314)
- Michelin AC10
- Michelin DESERT RACE
- Michelin ENDURO HARD
- Michelin ENDURO MEDIUM
- Michelin ENDURO MEDIUM 2
- Michelin TRACKER
- Mitas EF-07
- Metzeler MCE 6 DAYS EXTREME
- Find forest roads: Forest road map of Japan (location and length, in Japanese)
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.
Follow on X for updates
@2strokegoat ― posts when new tires and bikes are added