Calculating Bicycle Velocity


Found this bike brake light from a news article that popped in my newsreader and it’s quite interesting. LucidBrake inventor, John Craig, is improving his current tail light system that works on de-acceleration with a new TI inductive sensor and entered it in a TI design contest

The sampling rates available on the TI LDC1000 provide hundreds to thousands of readings for each spoke’s transition near the sensor, even for the fastest bicycles. The threshold output on the INT pin provides the perfect way to determine very accurate bicycle velocity - a simple microcontroller count between pulses does the trick. When velocity is decreasing at a significant rate, the brake light comes on.

Like LucidBrake, this inductive sensor could inspire other, new ideas from bike makers to calculate a bike’s velocity. From those measurements, a new simple power meter perhaps?



Waxed Canvas Hugga Tool Roll: Second and Last Batch

No recommended

Mark wants a koozie version that’ll have to wait

Seamstresses sewed up the last of the waxed canvas we bought into tool tolls and we put another batch on Amazon for sale. The tool rolls are $40.00 while they last, handmade in Seattle, AND 100% more aero than the bag sagging off saddles now with velcro straps that tear up your shorts. Endorsing the Hugga roll, Mark V did have one complaint

no storage for lemons and salt shaker.

True! And maybe we’ll make a mixer roll for the holidays with pockets for ice. A party-time solution we’ll look at later. For now, we want to stop ruining shorts, make changing a flat faster, and easier to keep track of your tools

Ruined Shorts, Demanded a Solution

Beltro

Beltro’s ruined shorts

So where’d the roll come from? Well, this one time on a ride, Velcro straps flapped my inner thigh like a bird trying to escape for 50 miles. Those ruined shorts, like Beltro’s above, demanded a solution. Also, a bag small enough to not threaten your thighs, is fiddly with tools dropping all over the place when opened. With the roll, tools and spares are organized neatly in pockets and unrolled on a saddle when needed.

Tools

Tools, spares, organized, ready to go

Multiple Bikes

If you’ve got multiple bikes, the roll goes with you, not with the bike; a major convenience when you need to get out the door and on the road.

rolled up

Rolled up

In a jersey

In a jersey pocket

Get them while you can. We spent months developing the roll and starting shipping them two weeks ago. See the posts and more iterations on G+.



Make a World of Difference with World Bicycle Relief

After sharing a ride story from Sea Otter earlier this week, where I met and rode with World Bicycle Relief staffers, here’s a video of their latest campaign being announced today.


Also see another WBR-ride story about Jacob Seigel-Boettner and the documentary, With My Own Two Wheels. It’s about how bicycles and WBR change people’s lives abroad and in the States.


WBR’s goal is to raise $500,000 and they’ve raised $188,161 to date. That’s 1404 bikes so far….



Osprey Shuttle: Rolling Monolith

HUGE BAG

Osprey Shuttle 32

This bag arrived, so huge, it’s like a monolith to gear and travel being discovered. I placed it outside for filtered-light photos this morning. After the pug furiously barked at it, apparently concerned an alien intruder was in the yard, I thought the toddlers next door could pretend it was a spaceship from planet Osprey too!

Monolithic

Like a Monolith

You can stuff your courage AND all your gear in this hauler before your next big trip to race and ride. The Shuttle 32” / 110L is available from Amazon and a retailer near you for $299.95

32

All the gear you own in one bag



Terpstra’s Winning Roubaix Details

Terpstra on the finishing track

Terpstra winning on a Roubaix

The difference between Terpstra’s bike and the Roubaix SL4 I’ve been riding in the rain, since the Fall, is Force 22 instead of the Red 22 spec. When raced or ridden hard, the fenders are removed and the fast, Zipp Firecrests replace the 30s. Force is SRAM’s value group, with all the features of Red, at a more affordable price. When asked recently about it, I said, if I close my eyes and don’t look at the graphics it shifts just like Red.

B/W

My fendered Roubaix on a dreary day

Between the two, there’s about a $3K price difference. Terpstra’s race-winning Roubaix is around $9K and my parking-lot crit, rolling-a-fondo version is $6K.

Terpstra’s details:

  • Frame: Specialized S-Works Roubaix – 58cm*
  • Groupset: SRAM RED 22
  • Shifters: SRAM RED 22 DoubleTap with Reach adjust
  • Crankset: Specialized (175mm crank arm length) with SRAM RED 22 chainrings – 53×46*
  • Front derailleur: SRAM RED 22 Yaw with chain spotter
  • Rear derailleur: SRAM RED 22 – Short cage
  • Cassette: SRAM PG1170 11-26
  • Brakes: SRAM RED Aerolink
  • Chain: SRAM RED 22
  • Wheels: Zipp 303 Firecrest Tubular
  • Stem: Zipp Service Course SL - 120mm
  • Bar: Zipp Service Course SL-88 - 40cm (c-c)
  • Seat post: Zipp Service Course SL 27.2mm 0mm Setback

*I run a 110 stem, 52/36 rings, Contis tubulars or Hutch clinchers, and a Joule instead of the Garmin.

My Roubaix was also seen in our Tool Roll launch, including a gear story in Issue 11.

Terpstra Photo by Gruber uploaded to Flickr



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