Streetstock tyres..

[cowpoos]

If you can get a street stock 150 tyre to aquaplane, i'll give you $100!!

I'll take you up on that...let me borrow ya Kr next time I'm down!! I have a dastardly plan!!

[Sketchy_Racer]

ahhh...

Buddy the KR has long gone..

And your to fat to fit on the 125...

[ajturbo]

ahhh...

Buddy the KR has long gone..

And your to fat to fit on the 125...

and you wouldn't want him to break it..... woops too late,

[Clivoris]

What a great thread. It seems that your experience down South Oyster goes contrary to logic, but has lots of good evidence to support what you are doing. That can't be argued with. The biggest difficulty I can see is that, as others have suggested, if the worst ever happens and a coroner looks at information like tyres being used for other than original purpose, somebody is in the shit. Most especially, after a report commissioned by MNZ specifically recommended otherwise. If I was an MNZ decision maker I would be very nervous about changing the ruling.
I'm no lawyer, but "logic" would suggest that the original report for MNZ has missed some important information and MNZ will need a report that addresses these missed bits. If MNZ has this information documented, as well as clear documentation of the debate and any process that they went through to change the ruling, a coroner would be able to look back at this and conclude that a robust process was gone through with good intent. This tends to be very important in my field (health) where life and death decisions are made. The translation being, you can go against what "logic" or training might otherwise suggest as long as you have the decision making process and rationale documented; and it seems that it was a reasonable thing to have done in the circumstances. A documented risk/benefit analysis of the various options is always useful too. I hope that I have communicated this clearly.
You may already have such a report, and I would think about appending this thread to it.
Good luck. I'm certainly shifting backwards and forwards in this debate.

[oyster]

Clivoris. Yep, you're easily understood, and dead in line with our thinking, as as we've presented to MNZ. I used a saying in an earlier posting "by accident or by design". This really means if we were starting from scratch we'd think differently, but we're not, and as a result have good statistics to show what works and what doesn't. This is why we want to use race tyres for racing (surely no problem here?) and grooved slicks for the wet (as used in other classes, countries and in Kartsport NZ) as a safe tyre in wet conditions.
As you say, all that's needed is thorough testing, compiling of existing statistics and someone trusted to "sign off". Then, not only do we have something safe, but the butts are covered as well. Don't worry, all this has been done and said by us, that's why we've appealed and have this meeting on 18th August, where hopefully all is resolved. For the record, we had our worst ever raceday for Streestock at Levels on the weekend. 35 riders, 4 major crashes. 1 nothing to do with tyres, the other three all on TT 900 GP tyres. Same analysis for all "no warning, it just let go suddenly"

[vtec]

Well I know a lot of the Streetstock bikes use 110 profile tyres, but I've got quite a few 120 profile front supersport tyres for sale that if they fit might work brilliantly on the back of a 150 streetstocker, extremely grippy and way tougher than is required for a 150.

[Tim 39]

I've got quite a few 120 profile front supersport tyres for sale that if they fit might work brilliantly on the back of a 150 streetstocker, extremely grippy and way tougher than is required for a 150.

are they supercorsers?

[ajturbo]

Well I know a lot of the Streetstock bikes use 110 profile tyres, but I've got quite a few 120 profile front supersport tyres for sale that if they fit might work brilliantly on the back of a 150 streetstocker, extremely grippy and way tougher than is required for a 150.

one of the vic club's bikes is running a 120.. it seams to work ok..

[ajturbo]

Clivoris. Yep, you're easily understood, and dead in line with our thinking, as as we've presented to MNZ. I used a saying in an earlier posting "by accident or by design". This really means if we were starting from scratch we'd think differently, but we're not, and as a result have good statistics to show what works and what doesn't. This is why we want to use race tyres for racing (surely no problem here?) and grooved slicks for the wet (as used in other classes, countries and in Kartsport NZ) as a safe tyre in wet conditions.
As you say, all that's needed is thorough testing, compiling of existing statistics and someone trusted to "sign off". Then, not only do we have something safe, but the butts are covered as well. Don't worry, all this has been done and said by us, that's why we've appealed and have this meeting on 18th August, where hopefully all is resolved. For the record, we had our worst ever raceday for Streestock at Levels on the weekend. 35 riders, 4 major crashes. 1 nothing to do with tyres, the other three all on TT 900 GP tyres. Same analysis for all "no warning, it just let go suddenly"

luke did the same thing... running tt900!..... but he was driffting the rear coming out of corners BEFORE that.....(presure to low/high?)

[Tim 39]

id be suprised if it was drifting due to tyre pressure (unless quite a wee way out) usually just overworn treads seem to have that effect