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Rocky Mountain Dirt Rider Associations - Races


Races are CMRC Sanctioned: -->

2011 Dirtier Moose XC Race
  • Fallen Timber
  • August 13, 14
  • Kids races Saturday, Adult races Sunday
  • A Cross Country is a long distance event on a course consisting of one or more loops. Minimum distance for each repetitive loop is 35 km. An additional 15 km loop may be added for Pros.


    • Volunteering and discussions about the RMDRA races can be found on the RMDRA Races Forum.

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    Sponsorship Opportunity

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    Race Requirements


    Race Numbers and Backgrounds

    New rules and numbering colors for 2010. Numbers must appear on the motorcyle with the appropriate background and foreground colors. All 3 number plates (front and side) must be numbered. For more information please consult the ADRA web site.

    Exhaust System
    Must meet the 96db sound limit outlined by the ADRA.
    Must be a USFS approved spark arrestor.

    Goggles
    Tear offs are not allowed during the race. A roll off system is acceptable.

    For further info on all race requirements visit the ADRA website: www.albertadirtriders.com

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    The Sound Issue


    Being active in keeping our riding areas open, we encounter many situations and opinions.  Our club encounters a few of our riding friends who continue to ride with loud pipes.  Noise annoys.   Period.  Most of the 4-strokes nowadays have so much power, why would you want to go up another 10 decibels for a small amount of horsepower?   Many land owners and shared access users don't understand our sport so we are ALWAYS up against the noise issue.

    Most off-road events are on public lands where other people use the lands for other purposes too.  What they remember is the noise.  Noise annoys, period.

    Loud Pipes Risk Rights


    In this cloud-of-loud, here are some options that work:

  • Re-pack your muffler correctly (do this first!)
  • Run with the stock exhaust (if your bike is an offroad model with a quiet exhaust)
  • Run with the stock exhaust and modify it to be quieter
  • Run with an after market quiet muffler
  • Add an extension that points the exhaust downward
  • Add a thick cycle tube on the end of the pipe (pointing downward) or something thicker like a car radiator hose

    • Muffling a big bore four stroke motor isn't easy sometimes.  Anything you do to make it quiet seems to have the same effect as stuffing a potato in the exhaust pipe.  We've come to realize, however, that if there is going to be anywhere left to ride, its up to us to make our machines as quiet as possible.  I'd rather put up with a little less horsepower than have closed signs on my favorite riding areas, or be told it's ILLEGAL to ride on the acreage you purchased just for riding.  If you can put up with the stock muffler, leave it on.  "But it weighs 23lbs!" one rider said.  The lightest aftermarket mufflers shed a whooping 2lbs (Bid Deal on a motorcycle that already weighs 250lbs).

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    Sound Testing


    The Motorcycle Industry Council has put out a manual "Stationary Sound Test Manual" for off-highway motorcycles and all-terrain vehicles which has become the standard.  Included here is the pertinent information regarding sound testing requirements for the Alberta CMRC off-road events.  It is up to each individual rider to know the rules and requirements PRIOR to attending an event.

    **Remember, the noise limits are not just enforced during events, they are required to continue riding on both private and public lands.

    Make the

    RIGHT IMPRESSION

    • Let's face it, noise annoys.

    • Know the sound limits where you ride.

    • Maintain your exhaust system. Remember that noise doesn't equal horsepower.  Too little exhaust back-pressure can actually cause less power and engine damage.

    • Keep your RPM and speed down and steady when you're around non-riders.

    • Always use a spark arrestor.  It doesn't sacrifice power, but can save the forest from fires.

    • Protect your right to ride.  Remember: Less Sound = More Ground

    These are the basic rules followed by the Alberta Dirt Riders for the CMRC sanctioned events in Alberta:

    • The area for sound testing must be 30' from buildings, vans, motor homes, trailers or any other sound reflecting surfaces.

    • Sound testing requires at least two (2) people.  One person to control the sound meter and the other to work with the tachometer.

    • Set the sound meter to 'Slow Response' and the 'A Weighting Scale'.

    • Nobody should be within 4.5 meters of the machine being tested other than the rider and the sound testers.

    • When testing in winds above 32 kph, position the machine so the wind direction is parallel to the normal direction of the vehicle, exhaust down wind.

    • The machine must be in neutral.  Rider must be on the machine with both feet on the ground (ATV riders feet can be on the foot rests).  The machine must be vertical, stationary, and in neutral.

    • Sound meter is to be held at a 45° angle to the exhaust centerline, parallel to the ground and 50 cm to the rear of the exhaust outlet at the same height as the exhaust outlet.

    • Set the Vibratach Vibration Tachometer to the RPM listed in the manual from MIC for each bike Determine the RPM for make, model and year from the Motorcycle Industry Council tables.  Set vibrating tachometer to test the RPM's.

    • Hold tachometer flat on rear fender with your index finger in the center of the tachometer.

    • The tachometer operator must be in a position to hold the tachometer on the rear fender and operate the throttle simultaneously.

    Alberta Dirt Riders sound tests at every event

    • The sound meter operator must be positioned on the same side as the tachometer operator with their right foot positioned so that the tachometer operator can tap the top of the sound meter operator's foot when the target testing RPM is attained. (yelling potentially could affect the reading)

    • Vibration Tachometer for use in testing motorcycle sound levelsWhen the tachometer has reached the target RPM, the oscillating wire on the tachometer will swing in a figure eight (8) configuration.  There are some machines, like small four-strokes, which don't vibrate much.  These machines are tested when the yellow loop (at the end of the wire) is at its widest arc (when it is vibrating the most).  *NOTE: Some small four-strokes have a vibration spot just off idle, this will give a false reading.

    Alberta Dirt Riders purchased one (1) meter and testing system prior to the 2006 season.  These meters are used at each event and are calibrated several times during the season.

    Select the link below to download an electronic (PDF) version of the Supplement to MIC Stationary Sound Test Manual for Off-Highway Motorcycles and ATV's.

    1985-2005 Model Off-Highway Sound Test RPM Data for ATV and Motorcycles

    2006-2011 Model Off-Highway Sound Test RPM Data for ATV and Motorcycles

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