The OE tire sizes for the BMW R 18 (2020–present) are 120/70R19 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=120/70R19 / 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
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
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 120/70R19 options (9 total, 3 of them listed in the set section above)
Size 120/70-19: 9 exact, 0 in the same group. Shop links carry each tire’s own matching size.
Bridgestone’s line is “long life that makes itself heard.” A touring radial. One of very few current road tires available in 110/80R19, which covers both ends of the CL250, and it also has 120/60ZR17 (CB400SF) and 150/70ZR17 (GB350S rear).
Sizes: F 120/60ZR17, 120/70ZR17, 120/70ZR18, 110/80R19, 120/70R19, 110/80ZR18, 120/70ZR19 / R 150/70ZR17, 160/60ZR17, 170/60ZR17, 180/55ZR17, 190/50ZR17, 190/55ZR17, 160/70ZR17, 160/60ZR18
Where to buy
Bridgestone aims it at “on-road-centred adventure touring.” Strong on 19-inch fronts — 110/80R19, 120/70R19, 100/90-19 — so it fits the front of the CL250, CL500 and 400X. Rears go up to 150/70R17 (CL family) and 160/60ZR17 (400X).
Sizes: F 120/70R15, 120/70ZR17, 110/80R18, 100/90-19, 110/80R19, 120/70R19, 120/70ZR19, 90/90-21, 90/90V21 / R 130/80R17, 140/80R17, 150/70R17, 160/60ZR17, 170/60R17, 170/60ZR17, 180/55ZR17, 190/55R17, 190/55ZR17, 150/70R18, 150/70ZR18
Where to buy
The mainstay sport tourer, sold on its wet performance. It reaches into 18 and 19 inch, which is a wide net. The catalogue lists it in both the Sport Touring and Trail sections.
Sizes: F 110/70ZR17, 120/60ZR17, 120/70ZR17, 120/70ZR18, 110/80ZR19, 120/70ZR19 / R 140/70ZR17, 150/60ZR17, 150/70ZR17, 160/60ZR17, 170/60ZR17, 180/55ZR17, 190/50ZR17, 190/55ZR17
Where to buy
From Michelin’s Scorcher family (Harley-Davidson OE), the adventure entry. One pairing only: 120/70R19 and 170/60R17.
Sizes: F 120/70R19 / R 170/60R17
Where to buy
The Commander III’s predecessor. Still in the 2026 catalogue, and it holds sizes the III does not — 120/90B17 and 150/70B18 among them.
Sizes: F 120/90B17, 110/90B18, 120/70ZR19 / R 130/90B16, 150/70B18, 240/40R18
Where to buy
A radial from the Harley OE Scorcher family. Custom sizes run deep here — 140/75R17, 240/40R18, 130/60B21 among them.
Sizes: F 100/80-17, 140/75R17, 120/70ZR18, 160/60R18, 120/70ZR19, 130/60B21 / R 140/75R15, 150/60ZR17, 150/70ZR17, 180/55ZR17, 200/55R17, 240/40R18
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.
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
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 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.