There are two classes of sidecar outfits: Classic and Supervintage:

Classic Sidecar Outfits are limited to outfits built before 1968, and outfits constructed after such date that are consistent in design and construction with outfits actually built in the Classic period, subject to the following restrictions:
i.   Engine: One or two cylinder two or four stroke, built before 1968. Maximum 350cc two stroke, 650cc overhead valve, 750cc sidevalve. 5% overbore allowed. 

Exceptions: 

• Matchless G50 
• Norton Manx
• AJS 7R
• BMW Rennsport
• BMW R50/5 and R60/5 w/OEM (stock) engine internals, maximum 26mm carburetors and four-speed transmission.
• Ducati bevel drive single
• Honda CB/CL 450 w/OEM (stock) engine internals and OEM carburetors

Supervintage Sidecar Outfits are limited to outfits built before 1973, and outfits constructed after such date that are consistent in design and construction with outfits actually built in the period, subject to the following restrictions:
i.   Engine: One or two cylinder four stroke only, built before 1973. Maximum 750cc. Overhead valve or sidevalve only as expressly provided below.

Exceptions:

• BMW Rennsport
• BMW 4 speed /5, maximum 750cc (500cc and 600cc may use up to 32mm carburetors);
• BSA 650
• Ducati bevel drive 750
• Honda twin 450cc and 500cc
• Moto Guzzi 750
• Norton Commando 750 (and 850 sleeved to 750cc)
• Triumph 650/750
• Any period OHC single cylinder
• Yamaha XS 650,  maximum 650cc
• Suzuki Titan (T500) w/stock internals (NO TR500 components) 
• Any period two stroke, single or twin cylinder, aircooled, maximum 350cc

Why tech inspection is so important...

Rules applicable to both Classic and Supervintage Outfits:
i. Eligibility and classification of all outfits is subject to the final determination of the USCRA, consistent with the RR, and subject to the USCRA's sole and exclusive authority to amend these rules.
ii.   Design: An outfit or sidecar is a three-wheel vehicle leaving two tracks, with only the rear wheel driving, and only the front wheel steering. Driver's point of contact with steering controls must be rigidly attached to front forks or other steering assembly.  Center hub steering prohibited. Swingarms must be  2-sided, of period design and materials, and have a shock absorber located on each side without secondary linkage (OEM excepted; e.g., Vincent and NSU). Both sitter and kneeler designs are eligible. Sidecar chair must be rigidly affixed to cycle portion of the outfit, by a minimum of four rigid mechanical or welded connections. Driver must be positioned generally behind engine. Steel tube frame construction only: no stressed skin or monocoque construction. Sidecar design: front exit only, e.g., passenger must lean outside of the track of the outfit in front of the sidecar wheel. Chair may be on right or left of cycle portion of outfit. Outfit must be equipped with appropriate handholds for passenger, including but not limited to a passenger handhold on the rear outside of the outfit opposite the chair and to the back of the driver.
iii.  Suspension travel: Minimum 1 ½ inch on front and rear wheels.  Any sidecar wheel movement relative to platform is prohibited.
iv.   Oil coolers where fitted must be located so as to be generally visible to driver and passenger.
v.    Dimensions: The two wheels forming a single track must be no more than 3 inches out of line, measured center-to-center. Maximum track is 44" and minimum track is 32" (center to center of tires).  Maximum width of outfit 72 inches. Minimum ground clearance of 3 inches between any part of outfit and an imaginary horizontal plane beneath the tires, with outfit ready for competition with driver, passenger, oil, fuel and coolant. Maximum fuel capacity 40 liters (10.56 gallons). Maximum engine offset (measured from a point equidistant from piston-to-piston to an imaginary line drawn between the centers of the front and rear wheels) 3 inches. No part of the outfit may extend longitudinally more than 12 inches from the front and rear tires. Minimum clearance front tire to outfit 1 inch. There shall be sufficient clearance between the handlebar grips and any part of the outfit, at any time, such that the driver shall not become trapped or unable to operate the controls.
vi.   Bodywork: Sidecar wheel, rear wheel, and drive and primary chains must be adequately protected to preclude driver or passenger becoming entangled.  Period dustbin style fairings are encouraged. All bodywork and streamlining must be strictly consistent with the applicable period. Downforce generating devices and designs are expressly prohibited. Driver's torso and the passenger's body must be completely visible from above at all times.
vii.  Gearbox: applicable period components (or functionally accurate reproductions) only.
viii. Wheels and tires: Front and rear wheels must be of spoked construction. No slicks, or slicks treaded after manufacture.
ix.   Brakes: Working brakes on front and rear wheels mandatory; sidecar optional. Drum or single disc per wheel, provided that all disc brake components (disc rotor, caliper and master cylinders) are components (or functionally accurate reproductions) actually available in the applicable period. Friction linings and pads are unrestricted.
x.  All outfits must be equipped with a functional master electrical switch mounted within reach of both the driver and the passenger. Switch must be able to stop a running engine and turn off all other electrical systems. The switch's mounting plate and an area at least one inch surrounding the switch must be painted red and clearly identified "ON" and "OFF" for identification by track safety personnel.  In the discretion of the Director, outfits with driver and / or passenger who have participated individually in less than two USCRA sidecar events shall display a tape "X" on the back of the rider and passengers helmet.
xi.  The USCRA shall create a sidecar safety inspection committee consisting of up to five members and designate a sidecar safety coordinator for each event.  The designated coordinator and at least two other committee members to be available to inspect each registered sidecar outfit prior to the outfit being submitted to the standard tech inspection.  The focus of the safety inspection will be specifically to visually check for apparent or potential safety defects.  This inspection does not relieve the requirement for the machine to pass standard tech inspection, nor is it intended to be an class eligibility inspection.  It should be stressed that each team should performed their own inspection and not to rely on this safety inspection to replace their own regular preventive scrutiny.  Machines should be presented for safety inspection as early as possible.  If an outfit causes an incident or has a major mechanical failure on the racetrack, the team responsible must submit the machine to the safety committee as well as the normal track tech inspection to prove that the problem is corrected and won't recur.  Teams must consider that the inspectors are acting on a voluntary basis, have their own race program time constraints, and in no event assume any obligation or responsibility in performing the inspection.  In all cases the decision of the safety inspector shall be final.
xii.  If requested by a team during the safety inspection, for the first practice of the day a member of the Safety Committee will wear an orange vest and act as a Traveling Marshall to guide any new or inexperienced drivers on a low speed track tour, demonstrating a safe line around the track, on an as requested basis.  Teams participating in this "tour" shall display a large red "X" on the back of their leathers (or rain suits or helmets).  Teams who are practicing and are not involved in the guided tour will not interfere with this procession, passing as cleanly and discreetly as possible.
xiii.  Any machine consistently demonstrating a significant power advantage shall be subject to restriction at the sole discretion of the Director of the USCRA.
xiiii.  The sidecar class is designed to be fun, safe, and competitive, and as such good sportsmanship, honesty and a sense of fair play should exist at all times.  Driving maneuvers liable to hinder other sidecars, such as, premature direction changes, deliberate crowding or blocking or any other abnormal change of direction are strictly prohibited and shall be penalized, according to the importance and repetition of the offenses, at the sloe discretion of the Director of the USCRA.  The repetition of dangerous driving, even involuntarily, shall also be subject to penalty at the sole discretion of the Director of the USCRA, penalties shall range from verbal warnings to exclusion from racing.
xv.  The USCRA will conduct, an inquiry into every on-track collision.  Legitimate racing accidents will be handled differently from those caused by recklessness or over aggressive riding.  Inquiry should consist of interviews of the teams involved, other teams and race workers/officials who saw the incident to gather the facts  Appropriate action to be taken based on the results of the inquiry.

Table of Contents (click on any item to view that page)
Names and Addresses
Class Overview
Bumping
Rule Changes
Championship Points
General Rules
Early Vintage & Pre '65
Screaming 50's
Grand Prix (Period I)
Supervintage (Period II)
Middleweight (Period III)
Period IV
Formula RD
Formula CB350
Sidecars
American Twins