Total indicat…

Islandix truing tools use the acronym TIR to describe wheel alignment. Originally TIR stood for Total Indicated Runout but over time became Total Indicator Reading. If you want to get technical, runout is a measure of concentricity, which applies to radial wheel alignment but not lateral alignment (instead a measure of flatness). Wheelbuilders often say runout when referring to both and that’s fine.

Critically TIR is a Total measure, that is the maximum reading minus the minimum. On a rim brake wheel, for example, lateral TIR is the difference between shortest and longest spans from rim to brake through a full rotation of the wheel.

For various reasons some wheelbuilders prefer to describe alignment in plus-minus terms. In this nomenclature alignment is given as the difference between minimum/maximum readings and the midpoint.  If you prefer thinking about alignment in plus-minus terms, divide TIR by two. But don’t use the term runout to describe this measure.

Visual wheel centering

The Target Plot is a unified visualization of lateral and radial alignment, which helps reasoning about both dimensions at once. From version 1.2.2 it can track wheel centering too (the term centering is used because it translates better than the word dish).

How does it work? Wheel Analytics needs to learn the ideal/centered position of the rim. This can be established two ways, either (i) using a single lateral reference as you would with the Centrimaster v-block or (ii) checking two lateral references by flipping the wheel in the stand. The second method is universal so it’s the default and discussed here.

Initiate setup with the ‘c’ key on the keyboard or click/tap the scale in the bottom corner of the graph. A dialog opens waiting for the first lateral reference. Rotate the wheel so the valve hole is at the lateral indicator and press the left foot pedal to record lateral position. Flip the wheel in the stand, rotate to the valve hole and press the foot pedal to record again. That’s it. Now when you snapshot the visualization, direction and magnitude of any centering error is displayed.

How accurate is it? Accuracy hinges on repeatability of wheel position spanning removal and re-insertion. Technique plays a role — aim to tighten the wheel in the truing stand to the same degree with the same force every time. Do not overtighten. Better truing stands do a better job of resisting twist and deflection, which reduces the importance of technique. More will be written on this topic in a future article.

The image at the top of this article depicts a real wheel built in the Islandix lab. With a bit of luck the wheel landed 0.01mm off center to the left. The wheel was built using a Park Tool TS-2.2 and Wheel Analytics 1.2.2. This result was externally verified with a digital dishing gauge.

Radar re-homed

The free spoke tension graphing tool I’ve hosted online since 2013 has been re-homed to islandix.com/radar. Please update your bookmarks.

This tool is also available with Wheel Analytics under the name Tension Radar. When used with the Islandix ecosystem, you are independent of the cloud (functions without internet access). It works with your Islandix FP-2 foot pedal and supports custom tensiometer calibrations.

Feature FAQs

It’s the end of another year — thanks for your help making it a successful one.

Last year’s retrospective laid out the Islandix origin story and said 2022 would be about sales. The resulting customer contacts led to an influx of suggestions, which is appreciated. This post offers commentary on the most common ones. Broadly these fall into three categories: cost, hardware and software.

Read more →

Tensiometer winner

Photo courtesy of Tomi Biloglav

Congratulations to Tomi Biloglav of Sweden — you are the winner!

Tensio time

Check out this futuristic implementation of the Jobst Brandt tensiometer. We prefer this design for its insensitivity to distortion from the technician’s hand. Its symmetrical layout makes it equally natural to use left or right. Simple operation with highly repeatable results.

This tool is a limited edition, more than a year in the making. Machined to tight tolerances and finished beautifully. The tensio is equipped with the same Mitutoyo indicator we trust for truing and a specially relieved handle to accommodate the data cable. Each tool is individually calibrated.

How do you buy one? Unfortunately they sold out before being posted online (join the Islandix mailing list to get in on these deals). There’s hope — one tool has been held back and will be awarded to a Wheel Analytics owner by random draw. There are two ways to enter:

  1. Entry is automatic with every purchase of Wheel Analytics between today and the draw date.
  2. Past Wheel Analytics customers may enter by submitting a photo of your wheelbuilding area to tensiodraw@islandix.com. Submissions will not be reshared.


Draw to take place December 1, 2022 or as soon as practical thereafter. The winner agrees their name may be publically disclosed. Tensiometer to be picked up in Victoria, British Columbia or posted at the winner’s expense (postage only, can be marked as a gift for customs purposes but carries a declared value of $599). Prize includes no warranty and has no cash equivalent. Order today to enter!

Shop standards

A fireside story from my wheelbuilding career:

A customer brought in a brand new set of wheels. He purchased them online, a nice deal, but they arrived with insufficient spoke tension including one slack spoke. He didn’t feel safe riding them, which was the right instinct. The job was simple — finishing an incomplete wheelbuild. I provided before-and-after tension graphs and the online seller sheepishly reimbursed the customer.

What changes for your shop when you become a team of wheelbuilders? Does quality depend on who pulls the ticket? Do you talk about quality out loud? Write it down? Do you enforce quality standards? How do you keep quality high when there are changes in the team?

Leadership influences quality and consistency by setting standards. It helps if standards are reasonable. It works best if they’re measurable. If validating wheels to shop standards is fast and frictionless, staff wheelbuilders are likely to co-operate.

Wheel Analytics can help. Decide what constitutes a properly true wheel in your shop. Configure it in Wheel Analytics and your benchmark will be visible to staff as they work. The line between in-progress and complete is clearly defined. Tension too — for the low price of visiting each spoke with a connected tensiometer, Wheel Analytics calculates average tension and tension variance. Use this information to prevent spoke breakage from undertension, rim damage from overtension and re-truing comebacks from unbalanced tension.

It’s just as likely you have the opposite problem since most wheels can be made better with more effort. Some team members need to be told when to stop and defining standards puts a ceiling on how much to invest in one wheel. The solution is the same as before — consider standards ahead of time and measure progress. Move to the next ticket efficiently without second guessing.

Truing in 2D

The Target Plot is a visualization that combines lateral and radial alignment in one view. That’s useful because it helps us reason about wheels in a smarter way compared to dealing with one dimension at a time. For example fixing lateral alignment may help or hurt radial alignment as a side effect. We can increase efficiency by preferring adjustments with helpful side effects and mitigating harmful ones as they happen.

To steer wheelbuilders in this direction there’s an AI function that relates the visualization to steps required to improve the wheel. How does it work?

Read more →

Announcing 1.1

This week Islandix reached a new milestone. After six patches, Wheel Analytics has graduated to version 1.1. We’re happy with the software and gratified by your feedback.

The 1.1 series will continue this work, adding one new visualization. As thanks for your support Islandix welcomes all existing customers to this series without charge. It’s available now through the Update tab on your Wheel Analytics tool. For everyone else, Wheel Analytics is in stock.

Starting with 1.1.1, the tool is capable of checking for software updates automatically. Enable this feature by selecting Check for updates on the Settings tab. When an update becomes available, a banner is presented on the main screen — download and install with a single click.

Smart money setup

Photo courtesy of Sean Lerner

Wheel Analytics is a kit for adding visualization to your truing stand. It looks a little different from one installation to the next as each workbench has its own character.

The photo above is the workbench at Eastern Wheelworks , a shop owned and operated by Sean Lerner in La Grande, Oregon. Sean is a specialist offering wheelbuilds and suspension service in house. At Eastern you’ll get service advice from the same person who turns the wrenches, which is a model worth supporting.

A setup like his gets you into visualization for the smallest investment.

Sean took Wheel Analytics without indicators, opting to source his own from iGaging. He transferred the tips from his Park Tool analog indicators, saving quite a few dollars for a few minutes’ work. Since a pair of iGaging indicators can be had for as little as $140 USD, this is a cost-effective setup. If I could offer a deal like that without losing my shirt, I certainly would.

Sean bought a new computer for his wheelbuilding bench. He’s using the Raspberry Pi 400, a tiny all-in-one system that retails for $100 and offers plenty of power for fronting Wheel Analytics. That price includes everything — keyboard, mouse, power, storage, wireless and operating system — everything minus the monitor. Any monitor will work and Sean has chosen a large one. Large screens are great because they let you absorb visualizations without losing sight of the wheel. You can mount the display further away without sacrificing legibility.

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