OSB Asphalt Class Structure
 
CHINESE CLASS
Due to the low number of Spec Bikes purchased, we are putting the Spec Bike class on hold for now and morphing it into a Chinese Class.

CHINESE CLASS RULES
Bikes must be manufactured in the Far East, but, not from the island of Japan.
4-Stroke only up to 125cc
Open Mods
Open wheel size
KNOBBIES ALLOWED!!!
No Expert or Novice distinction.
No weight distinction.


If there are enough Spec Bikes purchased in the future we will definitely resurrect the class... if there are enough of the Chinese bikes that show up to justify any further distinctions to the Chinese Class, we will do that as well.

 
F1
This class is a NOVICE ONLY class run under the same rule specification as F2. It is designed for beginning racers who may not feel comfortable racing with Experts and/or large grids and DOES NOT count towards Overall Championship points.

1. Maximum displacement of:
a. 111cc air cooled 4-stroke auto clutch;
b. 100cc air cooled 4-stroke manual clutch;
c. 55cc water cooled 2-stroke; and
d. 65cc air cooled 2-stroke.

2. Any engine mods within CC range.

3. No limit on wheel size.

4. No GP frames allowed, any other frame and engine combo is allowed.

Legal bikes for this class include but are not limited to: KLX/DRZ 110, XR 100, TTR 90, YSR/XR 100 combo, KTM 50, YSR 50/60, and NSR 50.

 
F2
1. Maximum displacement of:
a. 111cc air cooled 4-stroke auto clutch;
b. 100cc air cooled 4-stroke manual clutch;
c. 55cc water cooled 2-stroke; and
d. 65cc air cooled 2-stroke.

2. Any engine mods within CC range.

3. No limit on wheel size.

4. No GP frames allowed, any other frame and engine combo is allowed.

Legal bikes for this class include but are not limited to: KLX/DRZ 110, XR 100, TTR 90, YSR/XR 100 combo, KTM 50, YSR 50/60, and NSR 50.

 
F3 presented by MiniRoadRace.org
1. Maximum displacement of:
a. 134cc air cooled 4-stroke;
b. 65cc water cooled 2-stroke;
c. 80cc air cooled 2-stroke; and
d. special inclusion MZ125.

2. Any engine mods within CC range.

3. No limit on wheel size.

4. No GP frames allowed, all other frame and engine combo is allowed.

Legal bikes for this class include but are not limited to: Extreme 125, XR 100/big bore, KX 65, KTM 65, YZ/KX/RM/CR 80 air cooled, KLX/DRZ 110/big bore, NSR 50/big bore, Derbi 50/big bore, and Aprilia 50/big bore.

 
F4
1. Maximum displacement of:
a. 105cc water cooled 2-stroke, unlimited mods within CC range;
b. 170cc air cooled 4-stroke, unlimited mods within CC range;
c. 230cc air cooled 4-strokes, mods limited to pipe, jet kit, and air box;
d. 150cc water cooled 4-stroke, unlimited mods within CC range.

2. No limit on wheel size.

3. Any frame and engine combination.

Legal bikes for this class include but are not limited to: CRF 230, XR 200, TTR 225, CRF150F, CRF150R, YZ/KX/RM/CR 85.

 
F5
1. Maximum displacement of:
a.125cc water cooled 2-stroke;
b.250cc water-cooled 4-stroke;
c.415cc air cooled 4-stroke;
d.DRZ/KLX 400 special inclusion;
e.Unlimited displacement for Sportsman machinery that retains 19" or larger front rim.

2. Motard class only.

3. Any engine mods within CC range.

Legal bikes for this class include but are not limited to: CRF/YZF/ KX/RMX 250, XR 400, DRZ/KLX 400, and CR/YZ/KX/RM 125, ANY F6 LEGAL BIKE IN SPORTSMAN CONFIGURATION.

 
F6
1. Maximum displacement unlimited.

2. Motard class only.

3. Any engine mods.

Legal bikes for this class include but are not limited to: CRF/YZF/KX/RMX/KTM 450, KTM 525, DRZ/XR 650, and CR/YZ/KX/RM 250.

All rules, class distinctions, and age limitations are subject to Race Director discretion. Classes may be changed to maintain a competitive balance or to accommodate unique machinery. If enough bikes show up that are “in-between” classes, we will do everything in our power to set up a class structure that will allow them to be competitive. Basically, whatever you show up with, we will find a place for you to race.


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