Proposed new wet tyre rule

[oyster]

Shaun.
In the South Island over the 4 years I think the average age has not changed, as we've grown from 6 to about 50 riders. Today, and during this period, about 90% under 20 years old. Of this group average age around 14, 15 years old.
The fastest, always, wet or dry, slicks or treads, about 14 years old
Certainly the "top 5" at present comprise 1 x 13 year old, 3x 14 year old and one just 15. Where the fast older ones? As we hoped for, they've graduated thru to Pro twin and 125GP
A current big influence is Young Junior Road Race. It's "feeding in" really good riders on their 13th birthday.

[Tim 39]

As for "capping" the class completely. Definitely no, as we are enjoying a great culture of mums amd dads, kids and all riding together at the moment.
Streetstock is excellent for any new rider, or returning one looking for that first step of confidence.

exactly my thoughts, racing is benefiting with this class so why "cap" it? thats what I couldnt understand. still a touch confused but so long as it doesnt happen im happy!

[Maarty]

Hi Glen, getting back to your crash, it actually made me fell sick, not for any other reason than I hate to see an accident like that. Over the years I have seen plenty and lost some good friends. While we may not agree on certain issues, it doesn't mean I like to see ANYONE hurt and that is the point of my arguement!
What made you crash? probably a combination of things, poor tyre choice (almost certinally), the painted line (probably), poor line choice, (probably) (( although this was probably more caused by the poor tyre choice that affected your line)) Inexperience?,(maybe)
Who knows, you would be the best one to tell that story.
Look, I am not going to bad mouth anyone here and I think that most have actually missed the point of this whole issue, SAFETY.
There is a vast chasim between decades of racing experience and decades of riding experience. That day at Teratonga there was probably more than 150 years of racing experience debating with 30 years of riding (not racing) experience. Which would you choose? For me it was a case of experience over ignorance( not meant in a vendictive way)
I can live with what I have done and will continue to do so.
My agend is not hidden!

Finally, like gremlin, I am out. I have followed this vitriol far enough.

regards to all

Maarty (yep! thats my real name folks!)

Ooops, Hey Pete, as strange as it sounds, those modifications didn't make enough of a differenc to warrent the effort that went into it. Dennis bike was standard and there was no real gains anywhere, appart form the fact my pegs didn't grind so much. So if your bikes are std, great, keep them so as they will probably be more reliable in the end. It was an experiment that didn,t work and was done not long before I sold that bike. FYI

[fatboy1]

MNZ have ruled and here it is. Panic stations for this weekend!

ROAD RACE (SAFETY) RULE CHANGE


The following rules are effective 1 September 2007.

22-12-10
Gazetted Tyres for 150cc Street Stock Class.
Tyres. Applies to 150cc Street Stock only.

The choice of tyre is optional, either a slick or a Dot/European approved road legal tyre on sale to the public. (No grooved slicks, modifications or treatments allowed to tyres)
All tyres fitted must be mounted on a corresponding rim as per the tyre manufactures recommendations of rim to tyre specifications. These shall be gazetted on the MNZ web site and up dated as necessary.
Tyre warmers not allowed.
Should the steward call the race wet then the rider, may use a DOT /European approved road legal tyre or a full race wet weather tyre marked not for highway may be used. (No slicks or grooved slicks allowed).
Wet race: A race if classified as wet, usually commenced in varying or wet conditions, will not be interrupted for climatic reasons and riders who wish to change tyres or make adjustments must enter the pits and do so during the actual race.
Should track conditions change due to climatic conditions after a race has started the steward shall stop the race to enable competitors to change their tyres Rule 6-13 will apply. Conditions for stopping and restarting a race Refer Rule 6-13.
On safety grounds a steward may stop the race should the conditions be considered dangerous.

[Tim 39]

the only way it could've been sorted out realy.
at least now the rules are more open as far as tyre choice

[Maarty]

Hi Team,
Sorry, one last comment re my previous posts.
the time Dennis and I did were relative to that time. It in no way denegrates the efforts of the amazing young men and womens efforts of today. The track at the time was substancially better in surface condition. I simply made a point that was relative to that time so please all you 150ss riders, don't be offended by that statement.
By the way tim, I think you will find that the tyre manufacturers don't support the 150 rim sizes with the current tyre spec's.

Regards

Maarty

[Sketchy_Racer]

Hi Glen, getting back to your crash, it actually made me fell sick, not for any other reason than I hate to see an accident like that. Over the years I have seen plenty and lost some good friends. While we may not agree on certain issues, it doesn't mean I like to see ANYONE hurt and that is the point of my arguement!
What made you crash? probably a combination of things, poor tyre choice (almost certinally), the painted line (probably), poor line choice, (probably) (( although this was probably more caused by the poor tyre choice that affected your line)) Inexperience?,(maybe)

Hey Maarty,

I think your quite correct in that combination.

After plenty of time sitting and thinking, i believe that Inexperience in selecting the right tyre (should not have been out there on that new slick) combined with the paint and possibly poor line chioce (??)

I feel this was one of the true 'racing accidents' where it was a combination of things to cause one big problem.

I guess that hindsight is a wonderful thing, and that I have learned something from it

------------------------------------------------------------------------

Back to the Tyre rule.

I think the new rule posted above is probably the best way to go about it. Sure it's not perfect, but its about as good as its going to get. Looks like streetstock riders may only be racing in the dry if they can't afford or don't want to buy treaded road tyres.

Cheers,

-Glen

[Kickaha]

All tyres fitted must be mounted on a corresponding rim as per the tyre manufactures recommendations of rim to tyre specifications.

There won't be any slicks being used then

[oyster]

"Gazetted Tyres for 150cc Street Stock Class.
Tyre sizes, 80/90, 90/90, 95/70, 90/65, 110/80, 110/90"

This is straight off the MNZ website, just now. It wasn't there this morning, so I contacted Paul Stewart to get it on.

This matter of tyre to rim matching is new (post July1st) and was first raised at the appeal meeting in Chch. Kick, you were there. The minutes said we voted unanimously in favour of this, which was not true and we refused to "sign off" the minutes re this and other matters incorrectly recorded.

In discussion with Johnny Hepburn, Board Member, Road last week he said this
gazetted list was to prevent extremes of fitment, and our current practices
were fine. I suggested a tolerance for front and rear, based on this, which was agreed to be submitted to the Road Race commisioner, who accepted it.
The tolerance was simple. 80/90min to 90/90 max front, 100/80min to 120/80 max rear.
This has not been accepted (it seems), but is able to be reviewed, so we are applying for a correction.
As it stands, even the popular 100/80 Dunlop tt900 and
Bridgestone BT39 sizes are excluded.
The rear sizes seem to be the problem, as they're only allowing the official manufacturer's "parts book" sizes.
The tyre manufactures, however, do allow 100/80 and 120/80 fitment to the 2.15 and 2.50 rims fitted to the popular 150's
Hopefully some news update tomorrow, we've a big race meeting on Sat!

[gav]

Why is a grooved slick not allowed for dry conditions? Surely a grooved slick should in theory heat up quicker and perform better?

[Sketchy_Racer]

cause appprently grooving tyres is not allowed... even though every other flippen class in NZ is allowed to do it!

[oyster]

I've just had an e-mail from MNZ

120/80 is now allowed, but 120/70 is prohibited.

Can someone help make sense of this?

[Kickaha]

I've just had an e-mail from MNZ

120/80 is now allowed, but 120/70 is prohibited.

Can someone help make sense of this?

As you do down in profile, the optimum rim sizes for the tyre change, it could be to do with that and even a 120/80-17 is meant to go on a minimum 2.5 wide rim

[Tim 39]

are 115 125gp slicks allowed??

[oyster]

Kick, some brands allow 120/80 on a 1.15 rim. See the Dunlop TT900 book, page 17. It's OK. Thanks for explanation re ratio etc, but still, if 120/80 OK,
surely 120/70 OK?