Until recently, the DirtySixer bikes were not using the usual multiple XX sizing denomination.

I changed that, and realized it was still hard to understand how much bigger the DirtySixer bikes were.

Thankfully there was a graph/drawing that a tall cyclist (Alexander) had done that I’m reproducing here.

Let’s have a look at our MTB frames.

Alexander’s idea is to measure and compare the cockpit of a bicycle with the reach and stack numbers. In his well documented graph, he found all the measurements for most of the big bicycles available in the USA and compiled all the info in the documents here.

The link is also available here if you want to compare by yourself and play with the data.

Stack and reach understanding material can be found in that link here.

The idea is to show that our MTB version, in 3XL, 4XL and 5XL is way up there in the chart. What you see as a bunch of dots in the lower left corner is what other brands label as XL bikes. Sometimes even 2XL (XXL). See how far they are from our 3XL (top left corner), 4XL (middle dot) and 5XL (top right corner)? This is why a DirtySixer 36er is what you need when the regular XL mountain bikes are too small for you.

Now let’s have a look at our AllRoad and Road frames.

The same conclusion happen here too, with the 2XL, 3XL, 4XL and 5XL DirtySixer frames being on top of the chart, way over the regular XL bikes from other brands.

Our AllRoad and Road versions, in 2XL, 3XL, 4XL and 5XL are way up there in the chart. Again, the dots in the lower left corner show the usual XL or 2XL (XXL) bike frames from other brands. Our 2XL is already way up there, and the 5XL didn’t even fit in the chart when I did this screenshot! A DirtySixer 36er is what you need when the regular XL bikes are too small for you.

Another thing to keep in mind in this data comparison is that DirtySixer use longer cranks.

With this info in mind and the drawings showing clearly the difference, its now easier to make the right frame size choice if you are tall or really tall.