Profile Design Threadless Size Converter (1" - 1 1/8")

It is 1"(25.4mm) -1/8 on the packaging but actual item inside is 22.2 diameter. What I needed is bigger diameter not this one that I received☹️☹️☹️

Holds well, much stronger design than modern competitors, cheaper than vintage stems for old bikes.

Using this on an old mountain bike to modernize the sketchy old stem. The description of a 1"-1 1/8" adapter is absolutely correct. Worked great, feels like a decent product from a reputable brand.1" refers to the OUTSIDE diameter of the existing threaded steer tube. The INSIDE of that is 22.2mm, which is the dimension of the lower part of this adapter. That's called a '1" threaded steer tube'1 1/8" is the size of the wider area at the top, where a standard threadless stem clamps.If you're not sure that this adapter is for you, take your old stem out and check the size with a set of calipers or for a size imprinted in it (22.2mm).If you are trying to adapt a 1 1/8" threaded or 1 1/4" threaded steer tube, you need a different adapter.

Es excelente el material muy liviano. Tenia la duda de que si era compatible. Porque el diametro es de 22.2, pero midiendo con em vernier es 21.2, y esto ha provocado que buscara varios. Por fortuna le quedo excelente a una bici de turismo (panadera) mejorando la imagen y sobre todo al cambiar el manubrio para poder dar vueltas

A very high quality quill stem adapter. The machining is of a much higher level than the usual cheap Chinese adapters that cost not much less these days to be honest.

I’ve bought a lot of these adapters over the years: this one is the best by far. Light; looks good; easy to use and isn’t too expensive.