IRC GP-1: sizes and matching bikes
Type: Trail ／ Street legal
About this tire
IRC calls it a “well-balanced all-rounder.”
Across the six axes, Pavement・Life sits at 4 and Sand at 1. A tire set up to be good at some things and to give up others. Of the 32 tires in the Trail group, 11 carry 4 for Pavement. 1 front sizes and 3 rear, mostly 18-inch.
Our rating (1–5)
| Sand | 1 / 5 |
|---|---|
| Mud | 2 / 5 |
| Rocks | 2 / 5 |
| Hard-pack | 2 / 5 |
| Pavement | 4 / 5 |
| Life | 4 / 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
- 2.75-21
Rear
- 3.00-17
- 3.00-18
- 4.10-18
Bikes whose OE sizes it fits
Of the 260 bikes on file, this tire’s size lineup fits the OE sizes of 74. 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 SX / 150 SX | 2020–26 | 80/100-21 | 100/90-19 |
| 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 250 SX / 300 SX | 2020–26 | 80/100-21 | 110/90-19 |
| KTM 250 SX-F | 2020–26 | 80/100-21 | 110/90-19 |
| 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 350 SX-F | 2026 model | 80/100-21 | 110/90-19 |
| 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 450 SX-F | 2020–26 | 80/100-21 | 110/90-19 |
| 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 |
| KTM 790 ADVENTURE / R | 2025–26 models | 90/90-21 | 150/70R18 |
| KTM 890 ADVENTURE | 2024 model | 90/90-21 | 150/70R18 |
| KTM 890 ADVENTURE R | 2025–26 models | 90/90B21 | 150/70B18 |
| KTM 890 ADVENTURE R RALLY | 2027 model | 90/90B21 | 150/70B18 |
| KTM 1290 SUPER ADVENTURE R | 2023 model | 90/90-21 | 150/70ZR18 |
| KTM 1390 SUPER ADVENTURE R | 2026 model | 90/90ZR21 | 150/70ZR18 |
| KTM FREERIDE E | 2027 model | 90/90-21 | 120/90-18 |
| Kawasaki KLX230 / S | 2024–present | 2.75-21 | 4.10-18 |
| Kawasaki KLX230 DF | 2026 model | 2.75-21 | 4.10-18 |
| Kawasaki KLX230 SHERPA S | 2025–present | 2.75-21 | 4.10-18 |
| Kawasaki KLX230R / R S | 2027 model | 80/100-21 | 100/100-18 |
| Kawasaki KX250F | 2027 model | 80/100-21 | 110/90-19 |
| Kawasaki KX250FX | 2027 model | 80/100-21 | 110/100-18 |
| Kawasaki KX450 | 2020 and 2027 models | 80/100-21 | 120/80-19 |
| Kawasaki KX450FX | 2027 model | 80/100-21 | 120/90-18 |
| Suzuki DR-Z4S | 2025–present | 80/100-21 | 120/80-18 |
| Suzuki RM-Z250 | 2020 and 2027 models | 80/100-21 | 100/90-19 |
| Suzuki RM-Z450 | 2020 and 2027 models | 80/100-21 | 110/90-19 |
| Suzuki V-Strom 1050DE | 2023–present | 90/90-21 | 150/70R17 |
| Ducati Desmo250 MX | current as of Oct 2026 | 80/100-21 | 100/90-19 |
| Ducati Desmo450 EDS | current as of Oct 2026 | 90/90-21 | 140/80-18 |
| Ducati Desmo450 MX / MX Factory | 2027 model | 80/100-21 | 110/90-19 |
| Triumph TF 250-E / TF 450-E | current as of Aug 2026 | 90/90-21 | 140/80-18 |
| Triumph TF 250-X | 2027 model | 80/100-21 | 100/90-19 |
| Triumph TF 450-RC Edition | 2025 model | 80/100-21 | 110/90-19 |
| Triumph TF 450-X | 2026 model | 80/100-21 | 110/90-19 |
| Honda CRF250 RALLY | 2020–present | 80/100-21 | 120/80-18 |
| Honda CRF250L / L〈s〉 (low-seat) | 2020–present | 80/100-21 | 120/80-18 |
| Honda CRF250R | 2020 and 2027 models | 80/100-21 | 100/90-19 |
| Honda CRF250RX | 2020 model | 80/100-21 | 110/100-18 |
| Honda CRF250RX (2027 model) | 2027 model | 90/90-21 | 110/100-18 |
| Honda CRF450R | 2020 model | 80/100-21 | 120/80-19 |
| Honda CRF450R (2027 model) | 2027 model | 80/100-21 | 120/90-19 |
| Honda CRF450RX | 2020 and 2027 models | 90/90-21 | 120/90-18 |
| Honda CRF450X | 2027 model | 80/100-21 | 110/100-18 |
| Honda RTL301RR / RTL260R | current as of Nov 2026 | 2.75-21 | 4.00R18 |
| Yamaha WR125R | 2026–present | 2.75-21 | 4.10-18 |
| Yamaha WR250F | 2027 model | 80/100-21 | 110/100-18 |
| Yamaha WR450F | 2027 model | 80/100-21 | 120/90-18 |
| Yamaha YZ125 | 2001–present | 80/100-21 | 100/90-19 |
| Yamaha YZ125X / YZ250X | 2022–present | 80/100-21 | 110/100-18 |
| Yamaha YZ250 (2-stroke) | 2001–present | 80/100-21 | 110/90-19 |
| Yamaha YZ250F | 2021–present | 80/100-21 | 110/90-19 |
| Yamaha YZ250FX | 2019–present | 80/100-21 | 110/100-18 |
| Yamaha YZ450F | 2019–present | 80/100-21 | 120/80-19 |
| Yamaha YZ450FX | 2018–present | 80/100-21 | 120/90-18 |
| Yamaha Serow 250 (Final Edition) | to 2020 | 2.75-21 | 120/80-18 |
| Yamaha Ténéré 700 | 2020–present | 90/90-21 | 150/70R18 |
| Royal Enfield Himalayan 411 | current as of Nov 2026 | 90/90-21 | 120/90-17 |
| Royal Enfield Himalayan 450 (all variants) | current as of Nov 2026 | 90/90-21 | 140/80R17 |
See also
Other Trail tires (31)
Tires in the same group, to compare ratings and size lineups.
- IRC GP-5
- IRC GP-21 / GP-22
- IRC GP-22 (17 inch)
- IRC GP-210
- IRC GP-410
- IRC GP-610
- IRC NF30s
- IRC NR35
- Vee Rubber VRM-021
- Vee Rubber VRM-022 / 022B
- Vee Rubber VRM-122
- Vee Rubber VRM-156
- Vee Rubber VRM-163 Dual Sport
- Vee Rubber VRM-193 F/R
- Vee Rubber VRM-206
- Vee Rubber VRM-219
- Vee Rubber VRM-221
- Vee Rubber VRM-274 / 275（ヤマハ TW200 用）
- Vee Rubber VRM-335 F/R
- Vee Rubber VRM-376
- Vee Rubber VRM-381
- Dunlop D603
- Dunlop D604
- Dunlop D605
- Dunlop K180
- Dunlop TRAILMAX
- Pirelli MT 60
- Bridgestone BATTLE WING BW-201 / BW-202
- Bridgestone GRITTY ED03 / ED04
- Bridgestone TRAIL WING TW301 / TW302
- Michelin ANAKEE STREET
- 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