Can I tell the inner diameter of my 1″ head tube without removing the headset?

Asked by: Anthony Hoover

How do you measure the diameter of a head tube?

Measure the widest portion of the inside of the bearing while keeping the tool square to the flat edge of the inner bearing race. This is the internal diameter. Now measure the widest portion of the outside of the bearing while keeping the tool square to the flat edge of the outer bearing race.

How do I know my bike headset size?

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.

How do I measure my steerer tube?

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 do you measure cup size on a headset?

To determine the correct inner diameter of the upper headset cup, simply measure the diameter of your steerer tube. To determine the inner diameter of the lower cup, measure the steerer tube directly above the fork crown.

What is steerer tube diameter?

What are the common steerer diameters? The other key part to consider is the steerer diameter. The standard sizes are 1 inch, 1 1/8 inch, 1.25 inch and 1.5 inch steerers. You may occasionally come across a 1-inch threadless steerer, but you’re more likely to find a threaded steerer in this size.

How do I measure my headset bearing size?

The Internal Diameter – Measure the widest portion of the inside of the bearing while keeping the tool square to the flat edge of the inner bearing race. The External Diameter – By measuring the widest portion of the outside of the bearing while keeping the tool square to the flat edge of the outer bearing race.

How do you cut a steerer tube without removing a fork?

Quote from video: And just get a white marker and put a mark there there's some art now if you haven't got a white pencil you can always use a hacksaw blade.

How are fork tubes measured?

Quote from video: So if you're good with your eyeballs. You can just kind of guesstimate three millimeters or you can get a ruler.

How long should I cut my steerer tube?

It’s important that the steerer tube is cut at least 5mm shorter than the top of the highest headset spacer.

What is the size of a fork tube?

The traditional standard has long been 1 1/8” but some modern bikes feature larger 1.5” head tubes or even tapered versions, where the diameter of the tube at the bottom (1.5”) is larger than at the top (1 1/8”) , so you’ll need a fork with a tapered steerer tube to match.

Can you fit a tapered fork to a straight steerer?

If you happen to have a straight steerer fork, there are simple adapters that will allow them to fit a 1.5 Tapered frame, and you can fit a 1.5 Tapered fork into a 1.5 straight head tube frame, but you cannot put a 1.5 tapered fork into a 1 1/8†straight steerer frame.

Is crown race necessary?

Quote from video: Похожие запросы

How do you measure the head tube on an MTB?

Head tube angle – often shortened to ‘head angle’ – is measured from the horizontal to a line running down the centre of the fork steerer tube. Mountain bikes with front suspension usually have head tube angles in the 62-73° range while road bike head tube angles tend to be above 70°, commonly between 72° and 74°.

How are BMX forks measured?

Quote from video: If your fork is measured with an integrated bearing race you will measure from the top of the steer tube to the bottom of the race where it meets the crown.

What is the offset on BMX forks mean?

Offset. BMX Fork Offset. The Offset of the Fork is the distance from the center of the fork leg to the beginning of the axle slot in the drop out. This effects stability, steering, & front wheel tricks noticeably. The shorter the offset, the easier it will be to initiate front wheel tricks like nose manuals or footjams

What is offset in BMX?

Offset is a term used to describe the angle that the forks are at. This is probably the most important part of forks. Knowing the offset helps you make the right choice based on your riding. Steep offset: Makes your bike more responsive and nose manuals easier.