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SRAM Tandem Team Powers Their Way To Course Record At Leadville 100

SRAM Tandem team Strictly Business took first place and set a course record at the Leadville 100 with a bike outfitted with SRAM bike components and Quarq power meters

SRAM team James Meyer and Nate Keck broke the Leadville tandem course record this weekend, setting a new mark at 7:46:04 and knocking 28 minutes off the 8:14:11 ride set by Roca Roja Rollers in 2018.

Breaking records and tackling 103 miles on a bicycle built for two requires strategy, communication, and a bike that is up to the task. Meyer and Keck chose Ventana’s El Conquistador de Montañas to power through the grueling climbs as they raced to the finish line.

Scroll through the gallery below for equipment breakdown and ride analysis.

SRAM Quarq cycling power meters placed on a tandem bike,  SRAM XX1 Quarq power meter configured with a connect iQ to allow for bicycle power monitoring, SRAM XX1 Quarq power meter configured with a connect iQ to allow for bicycle power monitoring
Top: Ventana El Conquistador de Montañas: a fitting name for a Leadville machine. Empty weight: 44lb 3oz
Bottom Left: Captain crank is a bone stock SRAM XX1 Quarq power meter. The Garmin computers were configured with a Connect iQ datafield to allow both power meters to be monitored by both Captain and Stoker. No slacking off!
Bottom Right: The drive-side timing chain allows for the use of standard SRAM Eagle carbon cranks. The Quarq power meter is custom machined to mount two chainrings. The Captain’s drive power flows from the timing chain and chainring to the 32T drive ring, isolating the captain power output. This allows the stoker power meter to measure the stoker power only.
Left: SRAM Eagle AXS rear derailleur handles the shifting. GX cassette for extra durability with double the normal power. The Leadville course demanded 1858 shifts on race day. 
Center:  Integrated TyreWiz monitored the nominal 27psi front and rear in the 2.8” Specialized Fastrack GRID tires. Gauge tire pressure increased by 2.5 psi on top of Columbine due to the reduced air pressure at 12,400 ft and a bit of warm sunshine.
Right: The team rolled on a stock Zipp Moto wheelset. Tandems are not nimble machines, making descending a pick-a-line and hang-on sort of operation. Tires, wheels and suspension take a serious pounding. 

Top Left: RockShox Lyrik fork shorted to 120mm for proper frame geometry and more front-end stiffness. 200psi and zero tokens.
Bottom Left: SRAM Code RSC calipers with 200mm rotors handle the stopping. Brake discs started the day silver but ended the day ‘rainbow.’
Right: Somebody get these guys a ShockWiz, stat!   RockShox Monarch plus RC3 at 270psi
Left: Another SRAM Code RSC calipers with 200mm rotors in the rear.   Gold Jagwire hose rounds out the package.
Top Right: SRAM AXS controllers configured for roadie style ‘eTap’ shifting logic. Bar ends and Togs provide climbing and semi-aero positions for the 103 miles of Leadville terrain.
Bottom Right: Stoker gets the road drop bars treatment. Keep it narrow for better aero and reduce leverage. Stokers should pedal, not steer.
Left: Stoker gets assigned pacing duties. He can check in on progress every hour or two.
Right Top: A rare flat stretch on Columbine
Right Bottom: The 2019 Tandem Podium 1st Place: SRAM’s Strictly Business at 7:46:04 (course record) 2nd Place: QD Racing at 8:19:53 (third fastest tandem time ever) 3rd Place: Team Doza at 9:55:04 (Leadville PR for Captain and Stoker)

Gearing chart made through SRAM AXS app connected to Quarq power meter
Gearing was a 32T front ring pair with the GX Eagle 10-50T cassette. The 10T cog got the most raw ride time with nearly 1hr 40m of use. The 36 minutes in the 50T was key in the highest effort sections & allowed the team to clean the ultra-steep Powerline climb and ultra-high altitude Columbine goat trail. (The only dab of the day was on the short ‘Brutal Bill’ pitch. The Stoker contends this was due to Captain error.)

The team averaged a combined 380 watts for the day. Leadville has 5 major climbs. Keeping the effort even for the full day was key. Average power on the climbs: -St. Kevins: 586 -Sugarloaf: 519 -Columbine: 464 -Powerline: 435 -Carter Summit: 482 Final effort was Captain at 77kg, 230 NP, 3.0 W/kg and Stoker at 68kg, 210 NP, 3.1 W/kg.

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Quarq Introduces the Automatic Calibration Tool MagicZero

Quarq's MagicZero automatic calibration on the new SRAM AXS app for use with DUB power meters

How Does MagicZero Work?

MagicZero is a new algorithm from Quarq that automatically sets the zero-offset of your power meter as you ride. The goal of MagicZero is to let the riders forget that power meter Zero-offsets even exist. Zero-offset management by the user is an unneeded complexity that can be solved with thoughtful engineering.

MagicZero: Learning As You Ride

MagicZero works by continuously monitoring the torque signals from the strain gages as you ride. When the torque signals meet specific criteria for a period of time, a torque snapshot is recorded. Over time, these snapshots accumulate. When enough snapshots within a given tolerance are collected, then a new Zero-offset is computed and set in the power meter.

MagicZero allows the Zero-offset to be automatically managed by the power meter without any specific user actions. Typically, the MagicZero measurements occur when the bike is stationary, coasting, or slowly backpedaling. But as noted above, the criteria is designed to reject snapshots incongruent with recent observations. The MagicZero algorithm is intended to be continuously operating and reaching stable convergence on the correct Zero-offset. If at any point a misleading Zero-offset is applied, the algorithm is designed to self-correct without user intervention.

Powering Rides For Any Condition

MagicZero was developed over thousands of riding miles, in all kinds of disciplines; from Road to Gravel to Mountain Bike to Fat Bikes, going from 70°F houses to -4° South Dakota winters. We are not aware of any specific environments where MagicZero is inappropriate for use. However, it is still possible to turn off MagicZero and only use Manual Zero from the head unit. To do this, turn off AutoZero on your power meter from the SRAM AXS App.

MagicZero is a feature of Firmware 10 and is available via the SRAM AXS App for all AXS and DZero power meters.

Have feedback? Our riders are our best teachers! Please email us at thinkfast@quarq.com.

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7 Things You Didn’t Know About ShockWiz

 

  1. It is compatible with RockShox products as well as other air sprung suspension from manufacturers such as Fox, DVO, Manitou, Marzocchi, Formula, Cane Creek and Cannondale, just to name a few.
  2. You do not need to ride with your phone. All of the data that the ShockWiz records is stored on the device and can pair to your phone after the ride.

Continue reading 7 Things You Didn’t Know About ShockWiz

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What happens to tire pressure during a race?

Lots of things happen during a 206 mile adventure like The Dirty Kanza that make it a must for anybody interested in two wheels. The preparation and execution require the perfect combination of emotional, physical and mechanical fortitude and the different approaches to this challenge are part of what makes the event so special.  Continue reading What happens to tire pressure during a race?

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Tire Pressure Explained

Purchase TyreWiz Now

Finding the right tire pressure involves a large number of related variables such as tire size, rim width, bike and rider weight and of course ride style and conditions.  

Perhaps the most important variable to consider is bike and rider weight.  Ultimately the tire is a spring with air pressure determining how soft (or hard) that spring is.  The more weight the spring is supporting the more air pressure will be needed to keep the spring from being in a constant state of compression and unable to absorb obstacles. 
Continue reading Tire Pressure Explained

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ShockWiz Custom Tuning Mode

On a mountain bike, suspension tuning can seem more of an art than a science. Once you start to achieve a good tune, aspects such as personal preference and how you want to use your bike become important.

The ShockWiz app offers three Tuning Styles: Balanced, Playful and Custom. When tuning mountain bike suspension, there is variance in how people like to ride and variance in different models of bikes. The Tuning Styles within the ShockWiz account for these variances.
Continue reading ShockWiz Custom Tuning Mode