Dedicated Subsystem WorkbenchPlatform Gen: 2021–2026

2021 BMW R 18 / Classic / Bagger / Transcontinental Tire Sizes, Cold Pressures & Gearing Ratios

OEM tire sizes, front cold PSI (), rear cold PSI (), sprocket teeth count, final drive ratio, and chain pitch for 2021 BMW R 18 / Classic / Bagger / Transcontinental.

Technical PassportOEM VERIFIED

Engine

1802cc

Cooling

Not Available

Final Drive

Shaft

Engine Oil

4.2 L (4.4 US qt)

Spark Plug

NGK MAR8D-JDS (Dual ignition, 4 plugs)

Front Tire

120/70R19 (or 130/90B16)

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Gen 2021–2026

Factory Platform Compatibility: All workshop fluid capacities, maintenance milestones, torque specifications, and consumables on this specification sheet are factory-identical across model years 2021 through 2026.

Select Model Year:(Active: 2021)
6 Production Years (2021–2026)

2021 2022 2023 2024 2025 2026

Suggested Items3 Verified Workshop Consumables Available for this Job

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Tire Engineering & Multi-Scenario Pressure Matrix

ETRTO Validated

Inflation targets calibrated across operating modes, verified rim width ranges, and certified alternate sizes.

Shop Direct-Fit Tires

Multi-Scenario Inflation Pressures

Solo Street / CommutingCold Baseline

Front: Not Available

Rear: Not Available

Two-Up Passenger & LuggageMax Load

Front: Not Available

Rear: Not Available

Off-Highway / Terrain Pressure

Maintain OEM cold baseline for street transfers; adjust -2 to -4 PSI for loose terrain.

Rim Geometry & ETRTO Envelopes

Front Wheel

OEM Rim Width:Not Available

Permissible Envelope:Not Available

Rear Wheel

OEM Rim Width:Not Available

Permissible Envelope:Not Available

Operating outside ETRTO envelope width alters crown radius, accelerates shoulder wear, and impacts lean stability.

Factory Dimensions & Verified Alternates

Factory Standard Sizes

Front:120/70R19 (or 130/90B16)

Rear:180/65B16

Shop In-Stock Matched 2-Tire Sets→

Verified Alternate Fitments

Factory standard sizing recommended.

Alternate profiles verified for swingarm, chain guard, and fender clearances.

Final Drive Gearing & Speed/RPM Calculator

Shaft

Factory reduction ratios, interactive sprocket gearing simulator, 6th gear cruising RPM matrix, and swingarm chain adjustment tolerances.

Launch Full Gearing Simulator Shop Hypoid Gear Oils

Drive Ratio & Torque Impact

Calculated Final RatioStock: 2.813

2.813 : 1

Drivetrain Torque Delta

OEM Factory Baseline Dynamics

Balanced all-around factory engineering calibrated for EPA emissions and street usability.

Countershaft Speedo Variance:0.0%

Speedometer reads true to factory calibration standards.

Cruising Engine RPM in 6th Gear

60 MPH

Stock: 3,491 RPM

3,491 RPM

70 MPH

Stock: 4,072 RPM

4,072 RPM

80 MPH

Stock: 4,654 RPM

4,654 RPM

Calculated using factory 6th gear ratio (0.923), primary reduction (1.681), and 180/65B16 rolling circumference.

Cardan Bevel Gear Maintenance

Recommended Belt:

Shop Bevel Gear Oil Find Direct-Fit Gearing Sets

Factory Chassis Geometry

Chassis Alignment, Drive Tension & Rear Axle Calibration

Precision workshop alignment tools, dynamic drive tension tolerances, and axle spindle calibration for the 2021 BMW R 18 / Classic / Bagger / Transcontinental.

Official NHTSA Safety Recalls & Technical Bulletins

0 Open Campaigns (Clean)

U.S. Department of Transportation compliance database (Title 49 U.S.C. Chapter 301).

Verify VIN on NHTSA.gov

No Active Federal Safety Recalls Reported

The U.S. DOT National Highway Traffic Safety Administration (NHTSA) records zero open safety recall campaigns for the 2021 BMW R 18 / Classic / Bagger / Transcontinental platform. Always check your individual 17-digit VIN at an authorized dealership or via NHTSA.gov for individual recall completions.

OEM Workshop Archives

Official Factory Service Bulletins & Field Updates

1 Documented Bulletin

Bulletin #BMW-24V716Safety Recall SIB 61 09 24: R 18 Big Boxer Reverse Gear Control Unit Waterproofing

Source: BMW_Recall24V716_RCRIT-24V716-8582.pdf

Mandated Torques:Torque: 56 N·m (41 lbf·ft) (Transmission Reverser Housing Screws - M10 Grade 10.9 with Loctite 243)Torque: 8 N·m (71 in·lb) (Reverser Control Module Screws - M6 x 25)Torque: 8 N·m (71 in·lb) (Battery Negative Ground Terminal Screw)Torque: 56 N·m (41 lbf·ft) (Right Footrest Bracket Mounting Bolts)

Consumable Specs:Loctite 243 Medium-Strength Threadlocker (83 19 2 210 339)Weatherproof Protective Connector Cap (61 13 8 384 550)

Genuine Part Numbers:07 12 9 908 52761 35 7 105 88961 13 8 384 550

NHTSA Recall 24V-716SIB 61 09 24 / Campaign 0000611900