Biketronics II

Introduction

This post is not about e-bikes (i.e., battery-assisted bicycles). I have a lot to say on that topic, actually, but that’s for another day. This also isn’t about electronic shifting; I cover that here and here. This post is about bike computers.

More than twelve years ago in these pages, I posted Biketronics, a survey of these handlebar-mounted computers (and related technologies like heart rate monitors, power meters, etc.). That was a surprisingly popular post. So, having recently purchased the fanciest (and perhaps wackiest) of these devices I’ve ever had, a Sigma Sport Rox 4.0 with GPS capabilities, I figured we could go another round. My every instinct tells me this is a terrible topic and that nobody could possibly be interested, but then I’ve been wrong before. (For example, my post on the spelling of “kindergartner” is now one of my most popular of all time.) So here we go. I’ll throw some totally unrelated gags in here and there just in case your interest flags.

By the way, a lot has changed since my original Biketronics post. Back then, of the fifty-two cycling pals I surveyed, only five were using GPS-equipped devices. Now virtually all my friends have GPS. So I’ll devote some focus to that.

Who even uses Sigma Sport?

Nobody uses Sigma Sport bike computers, at least in this country. I literally don’t know a soul who has one, except one guy in Germany. I had to order mine from some outfit in Spain. So why did I choose Sigma Sport? Well, Garmins are too popular, same with Wagoo or Wayco or Woohoo or whatever that other popular brand is. I don’t want to be like everyone else. Besides, I’m a cheap bastard, and all the modern GPS-enabled models are at least a couple hundred bucks. No thanks.

Besides, look at the loads of features you get with the Rox 4.0:

Sure, lots of modern bike computers have power meters built in, but how many have pierced earrings? You might say “plenty,” but you’re not paying attention: pierced ears are popular, but pierced earrings? Those are hard to come by. And I love the existential air of “protective seals removed and cannot be.” These seals, these seals … they cannot be!

I also wanted a Sigma Sport because my old one served me well. It looked outdated the day I bought it, and certainly had its quirks, but it featured a groovy lap timer that would enable me to easily see the time, distance, and heart rate of my favorite climbs after the fact. Alas, the plastic bits enabling that computer to snap into the handlebar mount started to wear out to the point that I had to rubber-band it in place.

That wasn’t foolproof either so eventually I epoxied it to the mount, meaning once the battery dies I’m probably screwed—plus I can’t move it from bike to bike. So I wasn’t in a hurry to replace the computer, but it needed to be done.

I sense your interest waning—I know mine is—so here are a few good names for a rock band:

Duck Husband

Repetitive Stress Disorder

Nipple Confusion

Loofa Harvest

Good thing I wasn’t in a rush, because the new computer took forever to arrive. Tracking the shipment online was like trying to measure continental drift. It made its way across Europe in not much more than a week, but then was stuck in the Netherlands for twelve days. I emailed support and the retailer wrote, in an incredibly long, mostly boilerplate email, “Your parcel is currently on its way and it is due to be delivered to you very soon… Based on our experience, Customs can take between 15-60 days to unblock your parcel and proceed with delivery.”

Rox 4.0 documentation

I never did manage to find a complete list of specifications for this computer, even on the Sigma Sport website, so I guess I can’t complain that it didn’t come with a complete owner’s manual either. There was a nice thick booklet, but it’s only thick because it’s in ten languages, including Czechoslovakian and Polish. (I guess I should be grateful English is even among them.) The manual is actually just a “quick guide,” with a QR code for the “detailed instructions” web page which is mostly just little videos that cover only what is in the quick guide. There are no instructions anywhere, for example, on how to sync the computer to the heart rate monitor strap.

Here’s an example of the quick guide quirkiness:

“Active” and “Auto-Pause” aren’t actually defined. You start a workout by pressing the big button, and stop it the same way, and there’s actually a way to tell the state (running vs. stopped) on the screen—but the instructions don’t tell you what it is! And why are these “most important settings” anything you’d want to mess with during training? Think about it: you’re in the middle of a workout, hopefully not in the middle of a fast descent, and suddenly you think, “I need to calibrate the altimeter!” Why would you think this? And, if you wanted to manually set the altitude, how would you even know what altitude you’re at, other than to check the altimeter that’s right in front of you? Okay, maybe you’ve reached an elevation sign, but a) are those really common enough to make this among the most important settings, and b) why would you trust the sign, which is after all placed wherever it’s convenient to dig a hole, over a device that auto-calibrates itself via GPS, with an easy way to true itself up? It makes no sense.

First ride

I set out on the first ride with the new computer without having messed with the display settings. The display is highly configurable, which is pretty cool, but of the thirty touted functions, not all can be included in your configuration. That is, you have to choose your favorites. I figured while I was getting my feet wet, I’d just go with the factory configuration. I didn’t have any heart rate data because I searched too long in vain to learn how to set that up and was running out of daylight.

The first thing I noticed was a compass, which is nifty but totally needless because I seldom journey anywhere. There was also this weird directional arrow that seemed to point around randomly. Descending Wildcat Canyon Road, I noticed my speed fluctuating quite a bit, which you’d expect with GPS due to the satellite signal being blocked by tree cover, etc., but I had paid extra for the wheel sensor, so this shouldn’t have happened. Kind of annoying, but whatever … I was enjoying the big bold letters on the display, anyway.

But then, about ten miles into my ride, I noticed the mileage only read five miles. WTF?! Was this thing a total piece of crap, unable to actually measure distance? But the duration looked correct, and the speed (other than the occasional fluctuations) also looked about right, so it wasn’t totally whacked. But then things got even weirder. My confusion became outright bewilderment when the mileage number actually started dropping.

You’re probably just dying to learn the solution to this paradox, but I’m going to interrupt this post with a proposed title for a country & western song:

No one wears a mullet anymore

Two-thirds of my way through the ride, the mileage number was lower than ever, and it just dropped the whole rest of the way. By now you’ve surely figured this out, as I finally did too. The hypothesis I formed a few miles from home proved correct as I rolled down my street and the numbers went from fractions of a mile to matter of feet, and reached almost zero when I hit the driveway. That’s right, the device was showing my distance from home (presumably as the crow flies). So the accuracy was not an issue … but what a weird thing to want to display on your computer. I’m still scratching my head on that one.

The phone app & sharing

My old Sigma Sport uploaded its ride files to my phone over NFC (near-field communication) which was kind of a manual process and took a little while. The new one uses BLE (Bluetooth low-energy) and is swift and automatic. Look at the pretty display of my ride today:

I can share the ride, in Strava-like detail, via a URL to a (presumably) private website, with a much larger map, and I can drag my mouse along the graphs and such. (The units shown here are, alas, metric but I’ve already figured out how to fix that.)

I even figured out how to export these rides into a format that my old Sigma Data Center software can import, so I can still have an unbroken record of my rides going back years. And I think I’ve mastered the various features of this thing (other than integration with komoot, which I may never need).

And now it’s time for a few more rock band names:

Pack Shrapnel

Clear Rectal Discharge

The Harried Parents

Dark Yarn

Now that the Android app and PC software are dialed in, and I know how to operate the computer, the only remaining problem is…

The speed & mileage mystery

I’ve got this fancy sensor mounted on my hub to provide “even greater accuracy,” so why do all the totals for my standard loop come out low? And why does my reported speed suddenly drop from 28 to 14 mph and then pop up to 32? I decided to query my bike team, to see if they have this issue, and if it’s even worth having that sensor on there (since it’s kind of ugly).

Right away, I received replies from six teammates. Two of them actually answered the question (short answer: no difference between GPS and sensor measurement), and the others provided a variety of interesting tidbits:

• The mph display often lags (jumps) while under tree cover, as does the elevation gain/loss. Piece of shit
• The device connects with a satellite. The choice of satellite affects the data. The device usually has a Satellite setting. Galileo is US satellites. GLANOSS is Russian satellites. If you set your device to choose both then supposedly you’ll get more accurate data. (There may be a third set of satellites available now, too.) If you ride a lot in one location, then travel  (like if you ride from Oakland every day then one day start in Sacramento or France) this can confuse the device. The solution is to find the necessary obscure setting and leave it outside for a specified length of time. (Read the instructions. You’re on your own.) The device works better facing certain directions, like north, I think. Something to do with astronomy.
• Dana if you get on Strava all your problems will disappear Do it! Do it! Do it!
• GPS based measurements aren’t perfect. Absolute GPS accuracy is typically in the 5-10 meter range for consumer devices, so the GPS measurement is typically combined with an inertial measurement unit (IMU), which gives accelerations and rate of rotations that are then integrated to get linear and angular velocities using a Kalman filter. This also means that if the GPS signal is degraded due to building or tree, your velocity doesn’t suddenly read zero. Since the IMU in consumer devices generally sucks, it’s not going to be perfect.

Wow, that’s a lot to digest. I for one am not interested in having the Russian government tracking my movements, and I’m not sure which device (the bike computer or my phone) is doing the actual GPS work and would have the necessary obscure calibration setting to true it up. I’m sure I don’t want to start doing northbound-only rides and coming back on a bus or something. Above all else, I think it’s time for some more cool rock band names:

The Incestuous Mollies

The Quasi-Vegans

Leap Smear

Hard Floor Tool

Getting back to my teammates’ feedback, I reckon that the hub-mounted sensor I’m using is indeed the highly sophisticated IMU described, and it’s just not engineered well enough to be that accurate … which is a bit of a shame, since the old-school ones, which had a magnet attached to a spoke that passed by a sensor that counted the wheel rotations, was utterly simple and infallible. Perhaps part of my problem is that I’ve mounted this IMU on the rear hub (so I don’t have to look at it). I have just discovered (via a video buried within its website) that Sigma Sport recommends front hub mounting for “optimum reception.” Is it worth moving it, or do I ditch it entirely? That brings me to my next question.

Does any of this matter?

My friend Craig, who wrote about the IMU, went on to say:

Of course, you never precisely defined what you’re trying to measure. Do you want to know how far the tire patch of your front tire travelled? Or, do you care more about your rear tire patch? Even a rider trying to go in a straight line makes micro adjustments while pedaling, so the front tire travels ~0.25% farther! The more you turn, the greater the difference between the front and rear tire path will be. Or, perhaps you care more about your center of gravity? In that case, every time you rail a corner, your center of gravity takes a route that might be ~1% less (depending on the radius of the turn and your lean) than your rear tire patch. Of course, does it matter? Did you do less work because your new device showed that your ride was 2% shorter?

I think he’s being diplomatic here; the more direct version of his question might be, “Who cares what your mileage and speed are when the bigger question is, when are you going to start training harder so you don’t fall off my wheel when I’m trying to be nice and drag you through a headwind?” And he would have a point.

The answer is, at least in the short term, I want credit for every last foot of my rides because I’m doing a friendly competition called Cycle Around the Globe to raise awareness around the problem of suicide, and to engage in the collaborative effort to help prevent it. (My personal fundraising page is here.) Currently I’m sitting in 15th place with 540 kilometers ridden, though the leader has 14,000 kilometers, which he achieved in a single ride … so I’m guessing he’s not using a consumer-grade IMU. In fact, I think he’s even worse than those mopeds and e-bikes on Strava … he’s just making shit up. But for a good cause!

Lap timer

Alas, there is no lap timer on the Rox 4.0 (even though this very basic feature is available on a $14 Casio watch). I think I know why: the vast majority of cyclists are on Strava, which tells them their time on any segment they could want, automatically. But no, I won’t join Strava. That kind of thing’s not my bag.

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Strava By Night - The Next Killer App?

Introduction

Everybody knows about the upcoming launch of Strava By Night, ever since news of this top secret project was leaked to the Daily Peloton.  I had to wonder, though:  why all the secrecy?  On a hunch that Strava has been quietly working with other companies to offer tie-in products, timed to hit the market together, I began making inquiries within the cycling industry.  Surprisingly, my Rolodex served me well, and now—though I missed the big scoop that the Daily Peloton got—I can offer some small scoops on related products in the works.

But first, my questions for Strava

The first company I wanted to talk to was, of course, Strava.  They’ve been famously tight-lipped with the mainstream media about Strava By Night, but we bloggers have our ways.  To my luck, an employee with knowledge of the initiative opened up to me, cagily at first but ultimately with enough enthusiasm that I have started to wonder if media leakage isn’t just part of Strava’s marketing plan.

First, I asked the predictable question, why Strava By Night?  Why open up a special KOM category that requires a segment to be ridden after dark, when conditions are much more perilous?  The employee replied, “Right off the bat, this seemed like a compelling idea just because it’s so easy to implement.  We’re already getting very precise GPS data about these workouts, and it’s trivial to index a user’s longitude and latitude, and the ride date and time, to a static table of civil twilight data.  So the eligibility for the SBN leader board is easy to establish, and we can just as easily publish the SBN eligibility timeframes on the website, with daily updates, for each user’s profile.”

“Beyond that,” he continued, “we obviously needed a reason to do it.  We talk a lot in this company about KOM saturation.  If you live in Cat Butt, Wyoming it’s probably not hard to get some KOMs, for segments of just about any [elevation] profile.  In popular Strava markets like the Bay Area, though, high KOM rankings are very difficult, particularly for older athletes—who are our key demographic, by the way, because of their income.  There are too many pros snapping up all the KOMs and these less seasoned cyclists are starting to get frustrated.  So, downhill segments, rewarding cajones  and drive over pure ability, have served that clientele very well for awhile.  But even those KOMs are becoming harder to get as Strava users improve their bike handling.  Essentially we have a problem of a finite number of KOMs needing to satisfy what we hope is a practically infinite pool of users.  SBN opens up a whole new realm, where boldness is even more highly rewarded.”

But what about safety and liability, I asked.  His response was emphatic:  “Look, the law is very clear on this point.  Strava is not a content provider.  We provide the framework for the competition, but that framework isn’t egging people on:  it’s the end users throwing down the gauntlet by putting up those KOMs.  They are the content providers, not us.  It’s not our job to provide a working prefrontal cortex for these people.”

But wait, I protested:  won’t users  just label most downhill nighttime segments as hazardous?  “Yes, that can happen, and that’s nothing new, but obviously there’s a built-in fix for that:  somebody else will just create a new segment with slightly different beginning and end points, like they already do.  Of course too much of that can frustrate people, but the social stigma of ruining everybody’s fun is generally enough to keep these segments open.  It’s worth pointing out that traditional cyclists, the kind who get their jollies going fast uphill and on flats and only during daytime, will probably be big boosters of SBN even though they themselves won’t use it.  With SBN, these daylight guys won’t have as many Strava downhillers barreling past them all the time.”

Light and Motion

Next I checked in with various makers of bike lights, and hit pay dirt with Light and Motion.  A member of their product development group, Burt McClure, spoke candidly with me about an SBN offering.  “Yeah, we’re doing a new light.  We’ve done a lot of R&D on this and have actually ended up revamping our approach, for this one model.  Instead of a very small bulb designed to balance high lumen output with great battery life, we’ve gone in a kind of gonzo direction with a bulb more like what you’d get in a photocopier.  Burn time is only about five to ten minutes, and the battery is a four-pound beast, but we think most of these Strava By Night segments will be short, and since they’re predominantly downhill, weight won’t matter.  And the brightness?  This puppy puts out 5000 lumens.  You could see the shadow cast by a grain of sand.  It’s a very exciting product for a niche market.” 

Google Glass

Next I made the rounds of all the young dudes in Mission Street lofts and Palo Alto tree houses who create Glassware—third party apps for Google Glass—to see if they were doing anything.  (I’d started with Google but they blew me off completely.)  Mike “Mudguts” Brack, head of a startup called GlassGnar, has been working closely with Strava on a descent-themed app.  “It’s an amazing tie-in.  With our app, Glass syncs up more or less continuously with the Strava or SBN KOM leader board.  When it detects you’re on an established segment it begins tracking your speed and time and comparing them dynamically with leaders’ metrics throughout that segment.  It locates your leader board position and displays it in real time on the Glass (all nicely backlit, of course).  When your KOM position starts to slip, the display number flashes red.  When your placing improves it flashes green.  The app may even give verbal encouragement through a Bluetooth earbud, like quotes from great movies—you know, ‘Metal damage … brain damage … YOU SHOULD SEE THE DAMAGE, BRONZE!’  It will help these athletes identify the weaknesses in their descending so they can step up their game.  And psychologically—man, it’s like nitro in your air/fuel mix.” 

I asked Mudguts if he was worried about danger and liability, and he just snorted.  “But I’m glad you asked,” he said, “because you’ve got to talk to my brother-in-law.  When he heard of my app he started working on something of his own.”

Insurance

Mudguts’ brother-in-law, Don Bruce, Jr., works for a boutique life insurance company called The S Group.  “We’re working on a new policy,” he explained, “that is like secondary life insurance.  As you know, life insurance companies don’t like to pay out policies for accidental deaths that might not be accidental.  There’s a widespread belief out there, right or wrong, that when a head of household wants to commit suicide, but doesn’t want to leave his family penniless, he gets his pilot’s license and flies a little Cessna into the side of a cliff.  Such deaths get a lot of scrutiny, and Strava By Night may end up slotting right into that profile.  This new policy will only kick in when a traditional life insurance provider refuses to pay.  So if your husband dies doing Strava By Night, you don’t have to worry:  your family will be covered.”  I asked if this policy will actually be called “Strava insurance,” and he said, “I’d like to do that but obviously I can’t.”  Besides, he said, he’s imagining the target market will be slightly broader than just Strava or SBN users.

Garmin

And what about Garmin?  After all, cycling-specific GPS instruments are what made Strava possible in the first place.  Will they be building an SBN-specific device?  Not exactly.  A member of the product development team at Garmin, who spoke with me on condition of anonymity, described a new product, codenamed the Edge 910 SBN, that will serve what he described as the “nocturnal market.”  Though he was coy about the exact design intent of this model, he allowed that, in addition to a backlight that can be easily turned on and off, the device features a breathalyzer.  “This is simply to help the cyclist ride responsibly,” he said.  “There’s no indication at this time that Strava has intentions of creating any more new KOM categories.”  (He spoke carefully, but I think I saw him wink.)

Disclaimer

I truly hope you’ve grasped that this is a work of fiction.  No, there is no Strava By Night, and every single product, person, and concept mentioned in this blog post is purely a product of my imagination.