R 18 Roctane tires
The OE tire sizes for the BMW R 18 Roctane (2023–present) are 120/70B21 front / 180/55B18 rear. Below are tires in these sizes, compared across brands. OE rim widths are F3.50 / R5.50 (from official specs; used for the rim-width check). 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.
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Tires that cover front and rear (3 models)
Front + rear set: 3 models can cover both ends (matching sizes in bold, based on F=120/70B21 / R=180/55B18). Shop links search on the model name alone.
Avon calls it “the ultimate custom tyre,” for large cruisers and tourers. AV91 front and AV92 rear are separate part numbers. Its real distinction is the ultra-wide sizes — 240/50R16, 330/30R17, 300/35VR18 — which make it one of very few tires that fit the Rocket 3’s rear. Availability in Japan needs checking.
Sizes: F MT90B16, 130/80B17, 140/75R17, 150/80R17, 130/70B18, 130/70R18, 100/90-19, 110/90-19, 120/70ZR19, 130/60B19, 80/90-21, 90/90-21, 120/70-21, 130/60B21 / R 140/90-15, 150/90B15, 170/80B15, 180/70B15, 200/70B15, 230/60B15, MT90B16, 130/90B16, 140/90B16, 150/80B16, 150/80R16, 160/80B16, 170/70R16, 180/60R16, 180/65B16, 180/70R16, 200/60R16, 240/50R16, 160/70B17, 180/60B17, 190/60R17, 200/50R17, 200/55R17, 330/30R17, 150/70B18, 180/55B18, 180/55ZR18, 200/55R18, 240/40R18, 250/40R18, 260/40R18, 280/35R18, 300/35R18
Where to buy
Shinko cites “excellent traction in the dry and the wet.” For cruisers, tubeless in every size, and it covers both ends of the Rebel 250 (130/90B16, 150/80B16). A whitewall version exists.
Sizes: F 130/90B16, 120/90-17, 130/80-17, 100/90-19, 130/60B19, 80/90-21, 90/90-21, 120/70-21 / R 160/80-15, 170/80B15, 130/90B16, 140/90B16, 150/80B16, 180/65B16, 160/70-17, 140/70B18, 150/70B18, 180/55B18
Where to buy
The touring version of the Commander III. It carries bagger-type front sizes such as 120/70B21 and 130/60B19.
Sizes: F 130/90B16, 130/80B17, 130/70B18, 120/70R19, 130/60B19, 120/70B21 / R 180/65B16, 180/55B18
Where to buy
Front 120/70B21 options (4 total, 3 of them listed in the set section above)
Size 120/70-21: 4 exact, 0 in the same group. Shop links carry each tire’s own matching size.
Bridgestone files it as an “on-road high-performance type.” The fronts include 100/90-19 and 120/70-21, which suit classically-styled cruisers. Bridgestone notes that “this is a rare size and delivery may take time.”
Sizes: F 130/90B16, 100/90-19, 120/70-21 / R 150/80B16, 170/70B16
Where to buy
Rear 180/55B18 options (6 total, 3 of them listed in the set section above)
Size 180/55-18: 6 exact, 0 in the same group. Shop links carry each tire’s own matching size.
Pirelli describes “a supersport-inspired tire for performance cruisers whose riders want a sporting ride.” It goes as far as 130/60B21 and 260/40VR18, so the custom sizes are well covered.
Sizes: F 130/90B16, 150/80B16, 160/70R17, 160/60R18, 100/90-19, 110/90-19, 130/60B19, 130/60B21 / R 150/80B16, 180/70B16, 180/70R16, 160/70B17, 180/55B18, 240/40VR18, 260/40VR18
Where to buy
Bridgestone’s line is “bringing US V-twins into a comfortable cruising space.” Aimed at cruisers, and Bridgestone states the rear’s wear life is substantially up on the previous product. It carries sizes other road tires do not — 120/70ZR18, 130/60B19, 130/90B16 among them.
Sizes: F 130/90B16, 100/80-17, 130/80B17, 140/75R17, 120/70ZR18, 130/70B18, 100/90B19, 120/70B19, 120/70ZR19, 130/60B19, 80/90-21, 130/60B21 / R 140/75R15, 130/90B16, 140/90B16, 150/80B16, 180/65B16, 180/70B16, 150/60ZR17, 160/70B17, 180/60B17, 200/55R17, 180/55B18, 240/40R18
Where to buy
Bridgestone files it as an “on-road high-performance type” radial. Aimed at large cruisers; the 130/70R18 front lands on the Gold Wing Tour, Rebel 1100 and Eliminator. ★ The rear (G850) is 190/60R17 and 180/55ZR18, which do not match those bikes’ OE rear sizes ★ Do not assume you can build a matched set.
Sizes: F 130/70R18, 130/70ZR18 / R 190/60R17, 180/55ZR18
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.