Modern Road Racing
SOUND OF SINGLES/BATTLE OF TWINS/SOUND OF THUNDER MISSION STATEMENT: AHRMA’s mission is to showcase single-, twin- and three-cylinder motorcycles which historically have been under-represented in modern roadracing. The Battle of the Twins concept was born in the late 1980s as modern Superbike racing became increasingly dominated by in-line four-cylinder machines. BOT racing kept alive the thunderous roar of twin-cylinder machines from British, European, and American manufacturers. Sound of Singles racing features modern interpretations of the classic single-cylinder racebike, encompassing everything from production bikes to one-off custom-built machines.
Deadlines: Pre-entry deadlines typically are the Friday two weeks before an event. For certain events, pre-entries may close sooner. Consult the schedule page for exact closing dates.
Race fees – All events except those highlighted below: Race fees for all events, pre-entry first class $95 each day; each additional class $85. AHRMA run practice days $135. Post-entry, first class $100 each day; each additional class $90. Receive a 10% discount for registering online. NOTE: Each day of racing is a separate event with a separate fee schedule. .
Practice days will be available at most venues on the preceding Friday (see schedule).
Confirmation and event details: Your entry will be confirmed by mail on receipt. Details such as directions, starting times and lodging are published in Vintage Views and by following the “Preview” links on the schedule at the bottom of this page.
Membership: Current AHRMA membership is required to compete in AHRMA national events. For AHRMA membership information, please contact us. Memberships and renewals are available at the track.
Required racing license: New AHRMA road racers are required to provide evidence that in the past two years they have either successfully completed an accreditied road race school or competed with another road race organization acceptable to AHRMA, including but not limited to AMA, CCS, WERA, AFM, etc.. The minimum age for riders is 18. New, novice AHRMA road racers may not be permitted to ride at certain venues. AHRMA offers a road racing school at most venues. For more information click here.
Required Transponder: AHRMA uses the AMB model 260x transponder for timing and scoring. This unit is required and is available for purchase from My-laps.com or for rent by AHRMA. If you would like to rent a transponder please use the rental form link found under each event on the Schedule and Results page of this web site. For more information Click here
Medical insurance: Proof of personal health coverage is required. If needed try this form. Medical Insurance Application (pdf)
Refunds: See AHRMA Handbook rule 4.7a. There may be refund restrictions for certain events.
The refund request form is available on-line.
Race class options: The following classes are available. Check the AHRMA Handbook for complete details of class requirements.
Sound of Singles® (SOS)
|Sound of Singles®3: (SOS3) Two-stroke singles to 550cc and eligible four-strokes. (See Handbook for a list of the eligible bikes.)|
|Sound of Singles®2: (SOS2) Four-valve four-strokes to 510cc and two-valve four-strokes to 610cc.|
|Sound of Singles®1: (SOS1) Unlimited displacement four-strokes.|
|Motard Motocross, off-road, dual-sport and motard-specific four-stroke single-cylinder machines of unlimited displacement.|
Battle of Twins® (BOT)
|Formula 3 Twins: Pushrod OHV twins to 1000cc, OHC 2- or 3-valve to 800cc and OHC liquid-cooled 4-valve to 650cc.|
|Formula 2 Twins: Pushrod OHV machines to 1250cc, liquid-cooled OHC to 750cc, air-cooled 2-valve to OHC to 1000cc and air-cooled 4-valve to 1000cc.|
|Formula 1 Twins: No displacement limits. Engine modifications are unlimited, except on water-cooled 4-valve twins over 1000cc.|
|Open Two-Stroke: Air-cooled machines to 500cc, water-cooled motorcycles with tubular frame to 400cc and modern 250cc GP type machines.|
|Thruxton TransAtlantic Challenge: Supersport rules apply with some exceptions to the Triumph Thruxton, modified Triumph Bonnevilles and Harley-Davidson XL883 and XL 1200 Sportster.|
Sound of Thunder®
Sound of Thunder is open to unlimited displacement four-stroke singles; four-stroke twins of any displacement; three-cylinder machines to 1000cc; twin-rotor rotary engines; any eligible Open Two Stroke class machine; Turbocharging or supercharging permitted only on single cylinder machines; engines and frames may be of any origin.