How Are Fork Tubes Measured?

by | Last updated on January 24, 2024

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Forks are measured

where they clamp into the top triple tree

.

What size are Harley fork tubes?


39mm Diameter

Motorcycle Fork Tubes for Harley-Davidson Sportster.

How are Harley fork tubes measured?

Fork lengths measured in

inches from the bottom of the lower fork bearing cup

(or a point parallel to it on the fork tube) to the center of the axle hole. With this list, you can determine the length of a set of tubes, a springer, a girder, or whatever, you need.

How do I measure fork diameter?

3. Measure your fork steerer tube. You need to measure it in two places. The outside diameter (OD) of the top section (where the stem clamps around, as in the above pic) and

the outside diameter of the very bottom bit where the steerer goes into the fork crown

(where the headset crown race sits, as in the pic below).

How are motorcycle forks measured?

Registered. Forks are measured

where they clamp into the top triple tree

.

How do I shorten my Harley fork tubes?

Several options are available to shorten fork slider tubes. One is to source

shorter tubes

, readily available through Harley-Davidson, and made for lowered Sportsters like the Hugger.

How do I know what size my headset is?

Threaded headset sizes are

designated by the outer diameter of the steering column

. This can seem confusing, because the head cups do not measure the named standard. The threaded standards are 1 inch, 1-1/8 inch, and 1-1/4 inch headsets. The various standards are generally not interchangeable.

What size are my headset bearings?

The bearings are a slip fit into the frame. The common

1-1/8 inch standard

has a bearing outside diameter of nominally 41.8mm with a 45-degree bearing seat. Campagnolo® brand bearings use a caged ball bearing inside the bearing unit.

How many inches is a fork?

The dinner fork measures about

7 inches

in length.

Can you change fork oil without removing forks?

You will need to remove the caps to refill the fork tubes with oil. Determine if the fork legs have oil drain plugs near the bottom of the legs. If they do, you are in luck and will be

able to change the oil without

removing the fork legs.

How does a motorcycle fork work?

They use a stack of different

size shims to control oil flow within a cartridge

. At low speeds the oil bends the weakest shim and leaks through a bit, gently controlling the movement. If you hit that kerb, the sudden jolt forces the oil to bend all the shims and you get a massive flow, letting the forks move up fast.

How do you measure fork steerer tube?

3. Measure your fork steerer tube. You need to measure it in two places.

The outside diameter (OD) of the top section

(where the stem clamps around, as in the above pic) and the outside diameter of the very bottom bit where the steerer goes into the fork crown (where the headset crown race sits, as in the pic below).

Why Harleys are called hogs?

The Harley-Davidson team’s mascot was a small pig, which they would take around the track with them on

victory laps

. … It is because of this mascot that Harley-Davidson motorcycles are called “hogs.”

Does Kawasaki own Harley-Davidson?

Kawasaki Motor Company, LTD. is

the parent company of Harley

-Davidson Motor Company (as of now…

Jasmine Sibley
Author
Jasmine Sibley
Jasmine is a DIY enthusiast with a passion for crafting and design. She has written several blog posts on crafting and has been featured in various DIY websites. Jasmine's expertise in sewing, knitting, and woodworking will help you create beautiful and unique projects.