Street Stock 250cc 4-stroke twins

[mossy1200]

i think it the brand cuz my dads 900 has the same rim and tyre size as me but his dont buldge like the shinkos so im thinking 150/70 diablos as mt eden have a special on at the moment 499 front and rear plus fitting

Are they corsas or street tyres.Pirreli have several versions of similar tyre diablo strada ,diablo corsa,diablo supercorsa and diablo rosso etc so tell the shop your racing a lightweight bike on them so they understand why your buying the tyres.They may be able to match that price with more suited rubber.
Its the supercorsa you would want but do they make 110 front?Dont let them talk you into 120 if the front rim is less than 3.5inch.
Did you try price dunlop gpra10s as they do have 110 fronts from memory.They may be 50 extra dollars a set but try get the best deal and they may discount them.

[mossy1200]

What is the recommended size dude? Stick with the manufacturers size, they spent lots of time and money setting your bike up to be like it is. The sport demon are a decent tire but I found they lack a wee bit in lean angle.

I have just checked the tyre charts for 4inch rear and they back up the 150/70 as does hyosung.They just looked pinched in on that rim but that could be brand related.Surely its not and 3.5 or 3.75 rear rim?

There is not way you could get those tyres over to much further.If you got anymore than another 10mm off that chicken strip it would be over rover.The shapes not good.

[chaos rider]

Are they corsas or street tyres.Pirreli have several versions of similar tyre diablo strada ,diablo corsa,diablo supercorsa and diablo rosso etc so tell the shop your racing a lightweight bike on them so they understand why your buying the tyres.They may be able to match that price with more suited rubber.
Its the supercorsa you would want but do they make 110 front?Dont let them talk you into 120 if the front rim is less than 3.5inch.
Did you try price dunlop gpra10s as they do have 110 fronts from memory.They may be 50 extra dollars a set but try get the best deal and they may discount them.

no clue i will havee to go in and ask still

[chaos rider]

I have just checked the tyre charts for 4inch rear and they back up the 150/70 as does hyosung.They just looked pinched in on that rim but that could be brand related.Surely its not and 3.5 or 3.75 rear rim?

There is not way you could get those tyres over to much further.If you got anymore than another 10mm off that chicken strip it would be over rover.The shapes not good.

well the last 10mm i took off i got alot of chatter each time depending on speed

[mossy1200]

well the last 10mm i took off i got alot of chatter each time depending on speed

It would be good idea to ask a senior racer to look at your suspension and tyre pressures etc at the track.Small alterations make large difference to handling.
If Robert Taylor is at the track at race day then he is the one to ask.He will have a quick look and give you advice worth listening too.

[SS90]

well the last 10mm i took off i got alot of chatter each time depending on speed

I think it is fair to say Chaosrider, that there is every chance your rear tyre is too big for you rim, be it factory fitted or not.

In all reality, the pace you where doing at Pukekohe (in the wet) is not really enough to cause "chatter" as long as everything else is "not too far wrong"

I can't imagine your shock is too far wrong (for your first time), it is new, maybe they do crap out quickly (so we all hear), but since it is just a basic shock, the fact that it doesn't have enough adjustments available to your so that it could be so badly set up that your tyre would look like that if it was the right size.

It would be prudent to ask someone at a reputable tyre shop what size is correct (for your rim, the size of it are stamped on the rim)

The balling you see on your tyre is most certainly NOT from " power sliding", it simply showing that your tyre is getting hot (and it would seem that the size of the tyre is too wide for it's application), so that is something to think about.

If the tyre profile is too big (high) the sidewalls move too much, creating heat in the carcass, and cause it to ball up like that.

Sorry Chaos, but you where not "sliding" your Hyosung last weekend, your inexperience fooled you into thinking you where, but I assure you, you would have to be going one hell of alot faster than you where to be doing that (as well as have 200% more power)

It may be hard to accept that Chaos, but mate, it is the truth.

Trust me, I Know.

[Reido]

sports demons are great. (for me anyways =] im slow and noob)
My EX250J8 (or Ninja 250R 08) will hit 179 just before it bumps off the Rev limiter, I know its not actually 179, but thats not the point

Question?
when you passed them on the back straight, was it near where everyone was braking? cause passing them whilst they were in the que to go though the hairpin doesn't count. that was annoying >_>

Remember ages ago when we did the Northland loop with TOTO and about 30 odd other KBers. There was a long down hill straight. You were flat on the tank pinning it to catch up with the bigger bikes who boosted it down the hill.
I was behind you, slowly gaining, and had to back off a tad.

I've felt compelled to stay out of posting in this thread because im too nice.

Twin 250s, no, most 4 Stroke 250s = learner bike. So what's the fucking point


i feel better now =]

[Mully]

i think it the brand cuz my dads 900 has the same rim and tyre size as me but his dont buldge like the shinkos so im thinking 150/70 diablos as mt eden have a special on at the moment 499 front and rear plus fitting

Word of warning, I'm running Diablos on the RF - i don't like the things. The rear has a nasty habit of letting go when you're leaned over. I've had a few nasty moments on them. Waiting for them to wear out (and get some $$) to replace them.
IMO - find a Hyosung forum in the net and find out what tyres people are running on track days and what they think of them.

I can't imagine your shock is too far wrong (for your first time), it is new, maybe they do crap out quickly (so we all hear), but since it is just a basic shock, the fact that it doesn't have enough adjustments available to your so that it could be so badly set up that your tyre would look like that if it was the right size.

I think the Hyo has the same problem as the RF - the suspension components were chosen by the accountants and are therefore (relatively) rubbish. It's nothing a big wad of cash and a Shaun Harris/Robert Taylor couldn't fix....

I wonder if Chaos would be better to flog the Hyo off and buy something like an SV650 which had already had the work done to it. Might be a cheaper way to get onto more competitve machinery sooner.

[chaos rider]

sports demons are great. (for me anyways =] im slow and noob)
My EX250J8 (or Ninja 250R 08) will hit 179 just before it bumps off the Rev limiter, I know its not actually 179, but thats not the point

Question?
when you passed them on the back straight, was it near where everyone was braking? cause passing them whilst they were in the que to go though the hairpin doesn't count. that was annoying >_>

Remember ages ago when we did the Northland loop with TOTO and about 30 odd other KBers. There was a long down hill straight. You were flat on the tank pinning it to catch up with the bigger bikes who boosted it down the hill.
I was behind you, slowly gaining, and had to back off a tad.

I've felt compelled to stay out of posting in this thread because im too nice.

Twin 250s, no, most 4 Stroke 250s = learner bike. So what's the fucking point


i feel better now =]

i still had 5k to go on my revs by the time i hit the bottom, this was before i started changing gears more effectivly and youll find it much harder to creep op on me now plus i was passing all along the back straight near castrol, down the midle and before the hairpin if was still breaking slowly and compfertibly for my shinkos you guys must have been having tea

[ducatilover]

well thats what i was planning not keen on spending 600 for a set of tyres that could screw up the ride compleatly

well it sould be better then what i have dont you think plus i dont tend to lean that much yet so moving up(or down lol) slowly would be good especialy for $499

Try looking a the Pilot sporty I think they are a great tire for a smaller bike. Sport demons will be good for you to learn on, I didn't have any chicken strips on mine though and I wasn't going very fast, nor did the pegs ever touch the floor with them. As mossy said the gpr are good tires too. You may be better off paying a slight premium over the lesser brands.

I have just checked the tyre charts for 4inch rear and they back up the 150/70 as does hyosung.They just looked pinched in on that rim but that could be brand related.Surely its not and 3.5 or 3.75 rear rim?

There is not way you could get those tyres over to much further.If you got anymore than another 10mm off that chicken strip it would be over rover.The shapes not good.

I would expect it to be a 4 inch rim....
Hmmm It did look a bit suspect didn't it?

[chaos rider]

have you all noticced somthin about the subject of tyres?
no arguing cuz i only know 2 things about tires jack and shit

i know a small amount about the chemistry and construct but aplication to particulars like this i need help and see im listning

[ducatilover]

have you all noticced somthin about the subject of tyres?
no arguing cuz i only know 2 things about tires jack and shit

i know a small amount about the chemistry and construct but aplication to particulars like this i need help and see im listning

Isn't that nice for a change?

[RDjase]

I believe Chaos has a higher top speed than my bike. I have only taken mine up to 165km sitting at 11000rpm. It doesn't have much more speed to give unfortunatly. She's a nice learner bike tho, don't regret her as my first bike.

I did a flying 1/2 mile years ago on my RD350LC road bike. I got 179.9 Kmh out of it so close to 180 . 45 rear wheel HP(was 39 but junked the standard restrictive air box and mucked around with jetting on my mates dyno and got 6 hp. Air box technology has come a loong way in 29years lol)
It is 149.5 kg in road trim on reserve (2 ltrs maybe) That was weighed at the kart track. I had a 17 front sprocket instead of the standard 16, the mirrors taken off and it is a Naked bike. Me with my gear on is 75kg. The speedo wasnt too far out saying 187ish. I left that gearing on it as ,it still wheel stands easy as.
Good old 2 strokes before Power Valves aye

I have run a 120/80/18 rear on it and is crap. the standard sizing of 110/80/18 rear works much better and the tyre has a nice profile. Bigger is not always better

Get some new rubber Chaos and you bike will feel completely different to ride

[RDjase]

have you all noticced somthin about the subject of tyres?
no arguing cuz i only know 2 things about tires jack and shit

i know a small amount about the chemistry and construct but aplication to particulars like this i need help and see im listning

Good on ya chaos

[chaos rider]

i say no more lol