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Truett & Osborn

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A B C D E F G H I J K L M N O P R S T U V W Y Z

Truett & Osborn

In 1968, before Easy Rider (the movie), Easyriders (the magazine), $1.90 premium, and everything Evo, a couple of Kansas Harley riders named Bonnie Truett and Paul Osborn

decided what Sportsters in Wichita really needed was more cubic inches.

Since then, with more than 45 years and over 15,000 installed sets, Truett & Osborn

flywheels haven't failed once, even in the blistering conditions of top fuel. Truett & Osborn Cycle believes fast equals best. And because of that, our shop in the heartland isn't about engraved this and billet that. Truett & Osborn is a performance shop established, owned and operated by racers. At Truett & Osborn, the business is speed, the product is horsepower, and our work is to make more of it than anyone else. And for over 50 years, we have been doing just that.

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Products by Truett & Osborn in our web shop:

Truett & Osborn Stroker Flywheels for 45” Flatheads

There is NO Substitute for more cubic inches! Boost your little Flatty up to 54 cui or 900cc respectively and experience the change from a lame duck to an agile pony. These 4.5” stroker flywheels require special stroker pistons which are also available. Recommended for qualified mechanics only because the flywheels need to be balanced and the engine cases and cylinders must be relieved for the rods to clear. The selection includes: flywheels for stock 45” crank pin and connecting rods, flywheels for racing purposes which work with stronger 1957-84 Sportster crankpins and connecting rods,

Truett & Osborn Stroker Flywheels for OHV Big Twins

Of all measures to increase horsepower and torque of your factory engine, stroker flywheels are among the most effective. Boost your stock displacement 61” or 74” Knucklehead, Panhead or Shovelhead up to 84 cui (=1380cc) (@ 3-7/16” bore) and experience arm stretching performance and a significantly increased fun factor. Especially with original engine cases these 4.5” stroker flywheels are the way to go. If any, they require only minor modifications for installation and unlike with machining for Big Bore cylinders cases become not weakened. Consequently, engine life expectancy is near stock. All versions are of Torque Monster type with thick left flywheel as original and require special stroker pistons, which are also available. Manufactured from 80-55-06 ductile iron blanks, which are then heat treated. The 80,000 pound tensile strength blanks undergo an exacting 20-step manufacturing process, utilizing both CNC and conventional precision milling and machining. This insures accurate surfaces, legendary reliability, and excellent „truability“, an absolute necessity when setting up high performance motors to blueprint specifications. With pre-installed and replaceable connecting rod thrust washers, providing increased service-life and restorability. Recommended for qualified mechanics only, because the flywheels need to be balanced and clearances in engine cases need to be checked.

Truett & Osborn Flywheels

Worn flywheels are a major obstacle during the rebuild of an engine, mostly with big expenses required to put them back into service. In such a case it is often more economic and safer to go for a new set. The Truett & Osborn flywheels offered here are manufactured from 80-55-06 ductile iron blanks, which are then heat treated. The 80,000 pound tensile strength blanks undergo an exacting 20-step manufacturing process, utilizing both CNC and conventional precision milling and machining. This insures accurate surfaces, legendary reliability, and excellent „truability“, an absolute necessity when setting up high performance motors to blueprint specifications. They are made just like the stock counterparts, i.e. the left wheel is thicker than the right one (exc. JD and 45”), with the same weight and resulting torque. All versions are unbalanced and require adaption to the respective lower end components. All T&O flywheels feature pre-installed and replaceable connecting rod thrust washers, providing increased service-life and restorability.