Dedicated Subsystem WorkbenchPlatform Gen: 2014–2024

2021 KTM 690 Enduro R / SMC R 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 KTM 690 Enduro R / SMC R.

Technical PassportOEM VERIFIED

Engine

693cc

Cooling

Not Available

Final Drive

520 Chain

Engine Oil

1.70 L (1.80 US qt)

Spark Plug

NGK LKAR8AI-9 (Center) / NGK LMAR7A-9 (Side)

Front Tire

90/90-21 M/C 54R TT

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Gen 2014–2024

Factory Platform Compatibility: All workshop fluid capacities, maintenance milestones, torque specifications, and consumables on this specification sheet are factory-identical across model years 2014 through 2024.

Select Model Year:(Active: 2021)
11 Production Years (2014–2024)

2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024

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:90/90-21 M/C 54R TT

Rear:140/80-18 M/C 70R TT

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

Chain

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: 3,282 RPM

3,282 RPM

70 MPH

Stock: 3,829 RPM

3,829 RPM

80 MPH

Stock: 4,375 RPM

4,375 RPM

Calculated using factory 6th gear ratio (0.923), primary reduction (1.681), and 140/80-18 M/C 70R TT 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 KTM 690 Enduro R / SMC R.

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 KTM 690 Enduro R / SMC R 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 #KTM-21V792Safety Recall KTB2112 / HTB2110: 27mm Hydraulic Clutch Slave Cylinder & Bellows Gasket Seal

Source: KTM_Recall21V792_RCMN-21V792-9194.pdf

Mandated Torques:Clutch Slave Cylinder Mounting Screws (3x M6×25): 10 N·m (7.4 lb-ft)Clutch Line Banjo Union Bolt (M6): 6 N·m (4.4 lb-ft)Bleeder Valve on Slave Cylinder: 6 N·m (4.4 lb-ft)Front Engine Sprocket Nut (M20×1.5): 100 N·m (74 lb-ft) w/ Loctite 243Engine Sprocket Case Guard Screws (M6): 6 N·m (4.4 lb-ft)

Consumable Specs:Motorex Hydraulic Fluid 75 / Motorex Brake Fluid DOT 4/5.1

Genuine Part Numbers:Clutch Slave Cylinder DOT Cpl. 27mm (76132061044)Copper Gasket Ring 6×10×1 DIN 7603 (0603061001)HH Collar Screw M6×25 TX30 (0025060256)Push Rod O-Ring 9×1.5 NBR (50332062000)

NHTSA Recall 21V-792Bulletins KTB2112 & HTB2110