Clearing up some rules for a Modified open bike

[DaveB]

Hi

I’ve read thru the rule but would just like some help clearing some things up.
In the rule




7.F.11.3 it says :

“If a round headlight is used, it shall be between
5-1/2 in. and 7 in. outside diameter at the “lens”
surface with a front radius not less than 18 in.
The front surface shall be within 5 deg. of
perpendicular to the ground with the rider in the
normal riding position.”

Does this include if the bike was originally built with a non round headlight?





and also In 7.F.12 it says:

“There shall be no streamlining other than a seat or tail section to the rear of the rider’s body, and the
seat/tail section may not cover any of the wheel when viewed from the side. If a streamlined seat or tail section is used it cannot extend further to
the rear than a vertical line at the rear edge of the rear tire or be more than 36 in. from the ground with the rider seated on the bike.”

Does that meen the seat can cover part of the tyre but not the wheel/rim when looking from side on? and from what angle should you be able to see the wheel?
Because the seat on our bike is reasonably wide there is alot of difference between looking at the wheel while standing and looking at the wheel horizontally.

Thanks
Dave

[DaveB]

This might help a little, its a long way from being ready but thats the general shape of the bike

[Greg Watters]

Depends how the rules are read, in the US we have had to remove the tailsection on a gix 750 as a naked bike because the tail was wider than the rider
your cbr looks borderline on the rear length and for wheel coverage i would think looking at the same level

[DaveB]

From what we have read so far this will pass the rule 7.F.12 on seat height and being able to see the rear wheel from horizontal.

[RGV]

My idea of a wheel is, tyre + rim = wheel.
Just what my interpretation is, so open to comments.

[grumm441]

Hi

7.F.11.3 it says :

“If a round headlight is used, it shall be between
5-1/2 in. and 7 in. outside diameter at the “lens”
surface with a front radius not less than 18 in.
The front surface shall be within 5 deg. of
perpendicular to the ground with the rider in the
normal riding position.”

Does this include if the bike was originally built with a non round headlight?

If you are going to use a headlight that is not round, it will be considered to be streamlining

and also In 7.F.12 it says:

“There shall be no streamlining other than a seat or tail section to the rear of the rider’s body, and the
seat/tail section may not cover any of the wheel when viewed from the side. If a streamlined seat or tail section is used it cannot extend further to
the rear than a vertical line at the rear edge of the rear tire or be more than 36 in. from the ground with the rider seated on the bike.”

Does that meen the seat can cover part of the tyre but not the wheel/rim when looking from side on? and from what angle should you be able to see the wheel?
Because the seat on our bike is reasonably wide there is alot of difference between looking at the wheel while standing and looking at the wheel horizontally.

Thanks
Dave

The wheel is the wheel rim and not including the tyre
G

[DaveB]

Thanks for clearing it up Grumm, so as long as the headlight fits into the rules about round headlights its ok to use even tho my bike didnt originally have a round headlight?

[grumm441]

Dave
That's if you are running modified production

G

[RGV]

"7.F.12 Partial Streamlining:

No part of the fairing ahead of the front axle may be lower than the top of the front rim at the axle vertical centerline or be forward of the front
edge of the rim. Forward front fender coverage may not extend lower than a horizontal line through the front axle. There shall be no streamlining
forward of the front edge of the front rim. There shall be no streamlining other than a seat or tail section to the rear of the rider’s body, and the
seat/tail section may not cover any of the wheel when viewed from the side. If a streamlined seat or tail section is used it cannot extend further to
the rear than a vertical line at the rear edge of the rear tire or be more than 36 in. from the ground with the rider seated on the bike."

OK Im confused now. We have rim, wheel and tire all in this rule. Why dont they say rim when talking about the rear instead they say wheel.

It would to get this cleared up, well for me at least.

[AuotonomousRX]

If the Rule Book had something like this in it or even some simple drawings that would make it clear what the wording in the Rule Book means.




Stay Cool
Pete
LSR#866

[Greg Watters]

Many bikes have the tire partially covered

Can you change your pics to suit Grumms answer and not add to the confusion , others will no doubt refer to this post in future seeking answers

Pics would be ideal but who will do them

I have hand drawings next to the APS regs that i am trying to comply to

[RGV]

So we can take it that WHEEL should read RIM ??

There shall be no streamlining other than a seat or tail section to the rear of the rider’s body, and the
seat/tail section may not cover any of the wheel when viewed from the side.

[AuotonomousRX]

This is a perfect example of a Rule Book not assisting us but making things unclear.

I will have some time after Speedweek and would be happy to help out with adding drawings/pictures whatever to the Motorcycle Rules.

The Car section alraedy has a number of diagrams and a picture is worth a 1000 words.

Stay Cool
PeteLSR#866

[JonB]

IMHO the wording is just a result of the rule book evolving over time & different areas written by different people.

Looking at 7.B.10 it is clear what the intention of the word wheel is.

Wheel is American English, rim is English English.

Thanks for clearing it up Grumm.



Cheers
Jon

[RGV]

Good call Jon, that clears it up. It was under my nose all the time.