Bike Head Tube Sizes

This was especially challenging on 29ers where riders demanded shorter head tubes.

Bike head tube sizes.

This can lead to confusion since head tube inside diameters are dependent on the headset standard. Some bikes like the niner air 9 carbon which has a 100mm tall headtube were simply incompatible with rockshox. There s much more to understanding road bike frame sizing than effective top tube length stack and reach and choosing the right size is key to proper fit and handling. Mountain bike tyre sizes are usually stated in inches.

This can seem confusing because the head cups do not measure the named standard. A bike with a steeper head angle has faster steering. Mainly bmx older mountain bike bars. The two bearings at either end of the head tube are what make things work.

The threaded standards are 1 inch 1 1 8 inch and 1 1 4 inch headsets. The headtube angle is the angle at which the head tube is to the ground. The headset is the set of components on a bicycle that provides a rotatable interface between the bicycle fork and the head tube of a bicycle frame the tube through which the steerer of the fork passes is called the head tube a typical headset consists of two cups that are pressed into the top and bottom of the headtube. Stem clamp size grip area size application.

For example frames that take one inch 25 4 mm steerer columns can have. Traditionally these have been held in pressed cups but modern bikes also see bearings fitted directly into the frame. Head tube angle fork rake or offset fork trail. This size was also used for older british steel drop bars.

The various standards are generally not interchangeable. 7 8 obsolete british size for steel handlebars common on older 3 speeds. Threaded headset sizes are designated by the outer diameter of the steering column. So a 29 inch mtb tube will have the same diameter as a 700c road wheel while a 27 5 inch tube will be the same diameter as a 650b road wheel.

But let s start with the head tube angle. Head tubes can use one of several size standards bicycles. The head tube of a bicycle is sometimes designated by the fork steerer column it accepts.