Main Bearings

 Shop Engine Lower End Engine Cases

Main Bearings



Main Bearings

Crankcase Main Bearings Left 1912-1916 Twins

Crankcase Main Bearings Left 1912-1916 Twins

For the first years of heavy weight big twins (988 cc/ 60.3 cuin) the factory chose to use a metric bearing. To compensate for minor production irregularities, they used a so-called double-row self-aligning ball bearing. The dimensions of 25 x 62 x 17 mm seem familiar to someone who feels at home in dealing with inches and feet. But these dimensions are just the tiny bit off of common inch fractures. So, for all ye restorers out there: dont look further, here's the right stuff.
The flywheel spocketshaft is no press fit in the inner race, but a slide fit.

Individual Rollers for Main Bearings

Individual Rollers for Main Bearings

Until 1986, HD used quite a few bearings of the loose roller type in their engines and transmissions. We offer a complete selection of top-quality bearing rollers for this type of bearing.

Snap Rings for Engine Main Bearings

Snap Rings for Engine Main Bearings

Lock Screws for Left Bearing Races

Lock Screws for Left Bearing Races

Set of three lock screws which are used to secure the left side crankcase bearing race.

Lock Screws for Right Bearing Races

Lock Screws for Right Bearing Races

Lock screws which are used to secure the right side crankcase bearing race.

Crankcase Bearing Races Left

Crankcase Bearing Races Left

Until 1954 the left side bearing races of HD crankcases could be exchanged. The selection below includes races for most common models, including oversize races for worn crankcases.

Crankcase Bearing Races Right

Crankcase Bearing Races Right

The Cyclery Crankcase and Crankpin Roller Cages - Big Twins 1915-1936

The Cyclery Crankcase and Crankpin Roller Cages - Big Twins 1915-1936

Reproductions of OEM  bearing retainers for crankpins of all Twins 1915-1936 and sprocket shafts of Twins from 1917-1929.

Crankcase Roller Bearing Collars - Big Twins 1925-1936

Crankcase Roller Bearing Collars - Big Twins 1925-1936

Replacement collar which installs between the two left side roller bearings of your crankshaft.

Crankcase Roller Bearings - Big Twins 1936-1954

Crankcase Roller Bearings - Big Twins 1936-1954

Reproductions of OEM  bearing retainers, thrust washers and spacers for all Big Twins 1936-1954.

Crankcase Roller Bearings - 45”/750cc Flatheads

Crankcase Roller Bearings - 45”/750cc Flatheads

Bearing retainers and corresponding small parts for the crankshaft bearings of all 45”/750cc Sidevalves 1929-73, except K-models.

Flywheel Thrust Washer Set

Flywheel Thrust Washer Set

Complete sets with different sizes. Used to establish the correct side play of your flywheel assembly in the crankcases.

Crankcase Roller Bearings: Big Twin 1999→

Crankcase Roller Bearings: Big Twin 1999→

Sprocket Shaft Tapered Roller Bearings

Sprocket Shaft Tapered Roller Bearings

Quality bearings for the sprocket shaft.

Adjusting Spacers for Sprocket Shaft Tapered Roller Bearings

Adjusting Spacers for Sprocket Shaft Tapered Roller Bearings

Selection of adjusting spacers for the left side tapered roller bearing which you need when sprocket shaft end play is not within specs.

Pinion Shaft Needle Bearings: Big Twin 1987-1999

Pinion Shaft Needle Bearings: Big Twin 1987-1999

1/4” x 1-1/8” (nominal size) rollers in cages. Choose bearing size according to service manual procedure.

Pinion Shaft Roller Bearings: K/XL 1954-1977 and Big Twin 1954-1957

Pinion Shaft Roller Bearings: K/XL 1954-1977 and Big Twin 1954-1957

Pinion Shaft Roller Bearings: Sportster 1987-2020

Pinion Shaft Roller Bearings: Sportster 1987-2020

Pre-fabricated roller bearings. Choose bearing size according to service manual procedure.

Pinion Shaft Needle Bearings: Sportster

Pinion Shaft Needle Bearings: Sportster

Pinion Shaft Roller Bearings: Big Twin 1958-1986

Pinion Shaft Roller Bearings: Big Twin 1958-1986

Main bearings: roller bearings for the crankshaft

The classic Harley-Davidson V-Twin engine has crankshafts with roller bearings: with available oversize rollers to compensate for wear, or tapered roller bearings from industrial production, which are completely replaced. Roller bearings are well suited to absorb flexing forces of the crankshaft, which only has two bearings. Roller bearings are also more tolerant of misalignment of the two shafts.

Phone Service Operator Illustration

Have any questions?

Our service team will be glad to help out: Mondays - Thursdays 08:00-17:00 CET, Fridays 08:00-16:00 CET, Phone: +49 / 931 250 61 16, eMail: service@wwag.com