Jun 10, 2011Posted by in Modified JBL Loudspeakers Related Products, Pedal Power Utility Box, Pedal Power Utility Box Related Products, Products | Comments Off on Pedalometer

Pedalometer and utility box
Fun, accurate, motivating, and visible from anywhere in the venue.


The 3′ tall Pedalometer is an amazing help at Pedal Powered Stage events. This precisely calibrated system uses color-coded LED lights to display pedaling effort. Different colored sections correspond to dangerously low, dangerously high, and ‘sweet spot’ voltages. Your sound engineer and audience will know it’s time to kick up the pedaling when the LEDs blink red, or to cruise when white.

Pedalometer @ Climate Rally

Compatible with all Rock the Bike Pedal Power Utility Boxes and can be made to work with a Pedal Power Stage of your making. As part of a Pedal Power Stage purchase, it will be calibrated to your gear. If you already own the Pedal Power Stage, we’ll ask you a few questions about your gear to ensure it is calibrated (please call 1-888-354-BIKE).

See our Video Demonstration of the Pedalometer

Status: Built to Order

Price: $1,450.00

Our classic Pedalometer design in which a fan blows a beer can is now up-to-the-second with an LED display, but we still can’t forget the vintage version…

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Pedal Powered Stage Gear

Apr 23, 2011Posted by in Electric Fender Blender Pro, Fender Blender Pro Features, Generator Pro, How to produce a Pedal Powered event., Modified JBL Loudspeakers, Off the Wall, One Bike One Speaker, Pedal Power Utility Box, Pedal Power Utility Box Related Products, Pedal Powered Stage Gear, Pedal Powered Stage Gear Available Products, Pedal Powered Stage Gear FAQ, Pedal Powered Stage Lighting LED Panels, Pedalometer, Pedalometer Related Products, Roll Up Generator Stand | Comments Off on Pedal Powered Stage Gear

This is the gear we use at our own Pedal Powered Stage events, including the San Francisco Bicycle Music Festival.


A Pedal Powered Stage is a system that must include ALL of the following:

The following elements are optional:

  • staging
  • lighting

Creating a system yourself can be a great team-building experience but has a serious learning curve. Working with Rock The Bike will get you up and running much more quickly and with higher quality components. You’ll be able to put your focus on organizing events much sooner.

Let our experience work for you. We’ve been Pedal Powering music events since 2007.  This will translate to less frustration and more empowering moments when you use our gear at your events.

We would be happy to assist you in customizing a quote for your Pedal Powered Stage. Please note that the items in this category are often made to order. Please help us help you by giving us enough time to do our best work.

If you aren’t sure if you want to purchase or rent, you can check out purchasing prices with the “BUY” button below, or you can contact us for rental quotes HERE, or email

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Apr 23, 2011Posted by in Electric Fender Blender Pro, Electric Fender Blender Pro Related Products, LED Panels Related Products, Pedal Power Utility Box, Pedal Power Utility Box Related Products, Products, Rentable, Services, The Biker Bar, The Biker Bar Related Products | Comments Off on sLEDgehammer

sLED logo small
The sLEDgehammer is an interactive light challenge that harkens back to the classic carnival Sledgehammer game. But here, the aim is to convert your peak power output to a beautiful light display. The sLEDgehammer is accurate, motivating, and visible from anywhere in the venue. It’s a fun way to get your event participants thinking, cheering, and breathing.
The 9.5′ to 11′ Tower and Stand are a great way to show pedalers their power.

Customize the color of the Generator Pro Frame.

The sLEDgehammer can be purchased as a single-player challenge or a dual:


Above: Get multiple sLEDgehammers to add a competitive element and a larger presence at your event.

Rules of the game:

Pedalers must overcome the challenge phase in order to see the reward sequence. The faster they pedal, the more lights turn on, making it harder and harder to keep increasing the system voltage. If they push the lights all the way to the top of the tower, and keep them on for 3 seconds, they beat the challenge and win the game. Their stored energy is then used up in a dazzling display of light.  A difficulty knob makes the game easier or harder. The peak effort required to win is about 200W for the Easiest setting and 600W for the Hardest. In the Dual sLEDgehammer, everything is the same. To decide the winner, you start the two riders at the same time and give the win to the one who pushes the lights higher in the tower or gets the victory sequence to display first.
Watch this video to see pedalers compete for sLEDgehammer victory at the 2016 Democratic National Convention!

The elements of a sLEDgehammer:

  • An efficient bicycle generator, such as the Generator Pro.
  • The sLEDgehammer circuit, which comes complete in a strain-reliefed enclosure with an Ultra Capacitor and all power cables.
  • 5 colored LED panels standing to a height of 11 feet tall.
  • Halogen lights at the top to win the game.
  • A wide base untippable tripod stand.
  • User manual Here.
The Bike: Any of our hub generators will do. But more than our other activities, pedalers on a sLEDgehammer tend to use their whole body to try to beat the game. You may benefit from the additional stabilization of your generator. The Electric Fender Blender Pro, with its 3′ wide stance, is particularly well-suited to this application.

The Circuit: The sLEDgehammer circuit is the brains of the operation, calculating watts as you pedal. The sLEDgehammer comes in an enclosed, strain-relieved circuit capable of handling 1500-Watt surges in power. Depending on how many LEDs you connect, you may need all that power handling. People will try to break this machine. The sLEDgehammer circuit runs cool, calm and collected even when your participants pedal their hardest.

The sLEDgehammer runs on an Arduino Pedal Power microcomputer, using the open-source Arduino platform. What this means is that you can optimize or change certain parameters to improve the activity.


Custom Installations:

The sLEDgehammer can be installed in several ways. Our favorite method is doing large custom installs like the ones shown on this page. They can either be done for a single event or on a semi-permanent basis. Custom installations use the same components: bike, lights, and circuit; and can be tailored to your event, activity, or facility. We work with you to design and implement the sLEDgehammer. We then provide either full installation and crew at your location or help and guidance for your crew prior to the event.

Recommendations for output devices, i.e. Light:

Please see above about “rules of the game”. There are two lighting segments of a sLEDgehammer — the Challenge Phase and the Reward Sequence. To make the Challenge Phase truly challenging, you need to connect at least 200 Watts of lighting, perhaps as much as 500 for the fittest riders.  The most impressive way to achieve this and the best option for a large space is to use LEDs for both the challenge phase and the Reward Sequence. This makes the Challenge Phase visible to much larger groups of people, which increases the crowd interaction. A lower-cost substitution is to use incandescent bulbs for the Challenge Phase, which has the benefit of highlighting the comparative energy efficiency of newer lighting technologies. With incandescents, you can make the Challenge Phase truly challenging. Incandescents will cost less* because you need far fewer of them to achieve the Wattage goals of the Challenge Phase. (* That’s also the reason they are worse for the environment.)



11 Foot Tall Tower, Tripod Stand, and Circuit: $3,600.00

Assembled dimensions:  

The Tower is 53″ long x 132″ tall, 43″ wide.

The Generator Pro is 56″ long, 39″ tall, 31″ wide.

Rentable: Yes! Find out more.

Custom Installation: Contact us for options and pricing.

Build Time: Made to order. Please give us 4 weeks to build the sLEDgehammer, 6 weeks for a Dual sLEDgehammer and 2 weeks for the sLEDgehammer circuitry only.

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Modified JBL Loudspeakers

Apr 21, 2011Posted by in Featured Products, Modified JBL Loudspeakers, Pedal Power Utility Box, Pedal Power Utility Box Related Products, Pedal Powered Stage Gear, Pedal Powered Stage Gear Available Products, Products | Comments Off on Modified JBL Loudspeakers

A Rock The Bike exclusive! Our DC mod eliminates the need for AC power for your loudspeakers, making Pedal Powered Stages up to 44% more efficient.

Pedal Powered Stage
Above:  Modified PRX 612 wedge monitors in use as the band ZH performs. Also shown in aerial configuration in Rock The Bike’s Pedal Powered Line Array (suspended from Bamboo Tripod).

An awesome combination of light weight, efficiency, and Pro Audio clarity. The Modified JBL PRX loudspeaker has been an essential building block of our Pedal Powered Stage, and is in use by the Pleasant Revolution, SHAKE YOUR PEACE!, University of Oregon, UC Santa Cruz, Cello Joe, and the Mobile Music Project. Not limited to Pedal Power use, the Modified JBL PRX line is an amazing Mobile Sound speaker as well. The applications are as broad as your needs: bike parties, press conferences, or full-on concerts. We can help you craft a selection that will handle crowd sizes from 50 to over 1000 people.

Pedal Powered Stage

Normally, Pro Audio equipment runs on AC power, which in outdoor use must come from an extension cord from a nearby building, a gas generator, or an AC-DC inverter. If you’re starting your Pedal Powered Stage from scratch or are ready to upgrade your loudspeakers, go with Rock The Bike’s Modified JBL PRX. They deliver great sound with no AC power and save you up to 44% in power usage.

44% power savings– how’s that possible?  It’s true! We scientifically measured the power consumption of these loudspeakers in AC mode and Modified DC mode, by running a bass-heavy tone into the speaker and confirming that the audio output level was equal. The speakers used 35% less power in DC mode, for the same audio output! Add to that that the 9-10% efficiency penalty that most AC-DC inverters take, and you get a 44% power savings by using them in DC mode. In practical event use, this means you get the same amount of clean, clear, danceable music, but with 40% fewer pedalers. You can do amazing things with even one pedaler. In the world of Pro Audio, 44% is an unheard of efficiency gain, and the PRX line, with its digital Crown amplifiers, was already known for being an efficient loudspeaker.

JBL did the hard work of creating a full line of great-sounding loudspeakers. We cracked the code of getting them to run on good clean Pedal Power. You can combine these loudspeakers in a number of ways to create a small or medium-sized festival stage, or mobile sound system. We modify the speaker, adding a power jack that accepts a DC Split-Rail Power from our Split-Rail Pedal Power Utility Box.

Normally pro-audio gear is well beyond the abilities of the average person, in terms of ease of setup and use. But because these are powered speakers, it’s fairly straightforward. A ‘powered’ speaker means that the amplifier is in the speaker. You simply connect the power cable and the audio signal, and turn the volume knob to the desired setting. The speaker does the rest. For a press conference, you can run a microphone right into the speaker — you don’t even have to own a mixer. Similarly for mobile sound, you can run an MP3 player right into the speaker.

LiveOnBike performance
Above: A Modified PRX 612 in use for a LiveOnBike performance by the Shook Twins.

We sell the full line of JBL PRX Loudspeakers, however due to space considerations we keep a very low inventory of this item. Please get your project started early with us in order to hit your key event deadline.  Here’s the rundown of the speakers in the PRX Line.

612 — great sounding wedge monitor for live bands. Also can be thrown on the back of almost any cargo bike.

615 — similar but with its 15″ woofer, it can be used as a respectable main speaker as well.

635 — a dedicated 5″ midrange woofer in this speaker renders vocals and instruments with great clarity. 15″ woofer delivers plenty of bass. Discontinued

625 — most bass  possible within a single loudspeaker. A towering main that is well suited to dance music. Slightly harder to carry due to its height.  Discontinued 

618 XLF — The PRX subwoofer makes dance music come alive. To fully render the kick drum in live music or the beat in dance music, you need a subwoofer. For medium and large Pedal Powered Stages, there is no substitute. The sub also includes a built-in crossover that allows your mains to focus on mid-bass and higher. This way you get the best sound out of your mains and can run them louder before they distort.

bicycle powered stage
Above: The Modified JBL PRX 615 is a solid main.

Most bike music projects use car audio componentry, because it is cheap, widely available, and will work on 12 volt DC power such as a motorcycle battery. However, car audio equipment cannot amplify musicians at a concert, because it does not have the efficiency, overall listening levels, and clarity required. It was designed for small enclosed spaces, not large open spaces. That’s why you need Pro Audio equipment. Our modified JBL PRX loudspeakers are the best of both worlds. They provide concert quality sound and are ready for DC power, i.e. Pedal Power!

Above: The Modified PRX’s are fairly lightweight and can be towed by trailer or hauled on cargo bikes.

The package: lightweight but great sounding. All modified JBLs are made out of quality plywood — not plastic — and have a durable coating for dings and drops.  They can all be carried by bike, and with the exception of the 618 subwoofer and the 625, they can all be lifted by one person.

Above: Engineer Jake reviews the modifications of our JBL PRX amplifiers.

bicycle powered stage

Above: Locura’s bassist Izzy Wise digs the punch of the Modified JBL PRX 618 XLF Subwoofer.

bicycle powered stage

Our latest generation of Pedal Power Utility Box has ‘Split Rail’ outputs that connect directly to these speakers. You can ignore the AC power sockets.

Elevating the speaker on a stand (or by using our custom Line Array) puts them above ear level, which dramatically improves the clarity of the music when there are multiple rings or rows of people listening.

human powered stage

Above, left: 3 modified JBL PRX 612 loudspeakers suspended in a Line Array configuration at Bicycle Music Festival.

Since we do modify the circuit board, your JBL factory warranty will be void. We offer a 2-year warranty on this item. Here are some points that should reassure you that your investment will retain its long term value:

  • We maintain a relationship with JBL’s official Bay Area service point, JK Sound, and can take care of any issues that come up. JK Sound has successfully repaired amplifiers and replaced drivers for speakers post-mod.
  • After our initial R&D phase in 2009-10, we have had very few problems with this line of speakers.

We have confidence in these loudspeakers and stand behind the DC mod. We have been selling these to sponsored musicians in the Bay Area with great results, and without any warranty problems. The modified JBL PRX loudspeakers are also the secret behind Rock the Bike’s most famous art bikes, including the Blue Whale and El Arbol below.

El Arbol the bike tree
Above: El Arbol, the Bike Tree, uses the active components from the PRX 635 and 612.

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