Gravity “G” bike rules
The following specifications pertain to our G Bike class. Please follow these specifications when building your G Bike. The spirit of all these rules are for the participant to create, design, engineer the best G bike possible at his or her house on a minimal budget.
Along with the bike rules you must follow the "Safety Rules" and the "Race Rules" on their pages under the MORE tab.
All Gravity Bike frames must be free of cracks and rust. Frames may be either “round” or “box section” design. The frame should be a traditional and/or commercially manufactured ‘BMX, Cruiser or Mt. Bike Frame’ as the structural component or frame of the bike. These frames MAY be altered as you see fit as long as it is deemed safe by the club.
*No pocket bikes, motorcycle, mini-bike, scooter, or mo-ped frames. Bicycle frames only.
NO HOMEMADE FRAMES ALLOWED.
No CHAINS Allowed
The total weight of the complete, race/ride ready Gravity Bike is 350lbs with rider.
(exceptions can be made for certain body types to keep things competitive)
Weight ballast *(optional)
Solid weight ballast may be secured to the Gravity Bike frame via bolts. See above specifications. Body ballast is not permitted under any circumstances.
The wheelbase of a Gravity Bike cannot exceed 50 inches.
Fairings of any kind are allowed as long as they don’t impede the rider.
Body Parts *(optional)
Bodies and extended frame parts are allowed but may not extend more than 24 inches past the rear axle or wider than the handle bars. A rider must be able to get on and off the bike without impairment.
Wheel size 20 to 26 inches.
Wheel coverings *(optional)
Aero disks on wheels are allowed on the rear wheel only.
A minimum of 36 spokes/ per wheel or more are
Tires must be in good condition or better, with no cracks or excessive wear visible on any part of the tire. Tires must be pneumatic (filled with air, no solid tires).
Foot pegs *(optional)
Foot pegs, at or near the rear axle
Kneeler pads or kneeler boards *(optional)
Kneeler pads or kneeler boards must have no sharp edges, with no restrictions on material used.
Handlebar design is open to the rider. The handlebars cannot exceed the width of the rider racing.
Seating position and design
Seat design is open to the rider; in as much as the seat design/material proves no danger to any rider.
G Bikes must have working rear brakes capable of stopping within 300ft, from a speed of 60mph. Disc brakes are highly recommended, but not mandatory. Front brakes are highly recommended.
Any commercially available bicycle is permitted to race in this discipline, in as much as the design meets all the specifications above.