Tool Assembly

The latest versions of the tool (v5 and v6) come with the ruler cut into two pieces. If you have an older tool with the full 1m ruler in one piece (V4 or earlier), please continue to step (B).

(A) The two piece V5 and newer tool has been designed to that it can be slid together to be stored. This should be how it arrives when you receive it. You should be able to hang it by the hole in the ruler if you wish.

To assemble the tool slide the shorter piece (with the lower numbers of the scale) off the top of the other piece of the ruler. The lower phone holder, should be attached to the shorter piece of ruler and is then used to join the two pieces together.

These can then be adjusted to hold the phone as shown below.

Once the ruler is joined together you can proceed with the steps below, although (B) and (C) should already be fitted for you as in the above diagram.

(B) Ensure the Bottom Bracket (BB) locator end cap is fastened securely to the “0” end of the ruler. This is design to be a tight fit, and will need knocking on, I usually just tap it on the floor. Ensure that it is fully inserted. Ensure that the side with metric only is on top (showing in the window of the end cap).

(C) The Bottom Bracket (BB) / Handlebar measuring block needs to be slid onto the ruler next, with the arrow at the top pointing downwards. This line takes into account the 20mm offset when measuring the BB height from the ground.

(D) The remaining pieces can then be slid onto the ruler. Note that this image shows the V4 tool. On the V5 tool and newer, the phone holder is placed lower down on the ruler. This can also be done with the V4 tool if you wish.

(E) The Optional Seat Clamp spacers (10mm, 20mm) can be used if the saddle centre width is wider than 70mm. For wide saddles this spacer helps keep the seat clamp level and square on top of the saddle when measuring. Many saddle are 70mm or 80mm wide at the centre, some of the modern 'stubby' saddles are wider, e.g. 90mm or 100mm.

The interchangeable bottom bracket adaptors can be used to get the best fit for your particular crank set. These were introduce with V4 of the tool and are also available as an upgrade pack for existing customers. The square fitting is also compatible with most 3/8 socket sets, so it should also be possible to use other sockets to directly fit other nuts and bolts you may come across, e.g. many use an 8mm hex Allen key in the centre to tighten the crank.

The following 5 adaptors are available:

Included in the kit:

• Universal Dome – can be used for pretty much anything with a locating hole in the centre, including larger Allen bolts and open ends of hollow cranks e.g. SRAM. 

• Shimano Hollowtech – for the majority of modern Shimano crank sets.

• SRAM – Has 2 specific diameters the fits the majority of the DUB cranks, and many others

Available as optional extras:

• Shimano Power crank adapter - Specific for the Ultegra and Dura-ace power cranks

• V – a tapered V shape that can be used for any other type of crank to locate from the external width. Use with the cranks perpendicular to the ruler.

When using the tool we find it best to reconfigure between measurements so that you just have the components you need.