Cyrox = a shit and dangerous tyre

**racefactory** · 18th July 2010, 18:01

Just want to warn people not to buy the Bridgestone Cyrox tyre.

This has to be the worst piece of shit ever made and bridgestone should be ashamed. Of course everyone feels the rear sliding from time to time and I have put a few down recently to what I thought was cold weather and hard to spot slippery surfaces but today something happened that brought me to my senses...

Tyres warm, lower pressures to bring heat into them, fairly good weather, going around a smooth well surfaced bend at about 60kmh, not turning fast at all, absolutely nothing special with the lean angle... rear end just starts coming around drifting. A real in helmet 'woah shit!' moment.

I have heard Vtec talk about the drifting abilities of the cyrox but never though they could be this shit. Even with shitty stock GN250 tyres i have never had close to such an experience. Stay away from them, they are fucking dangerous...

**White trash** · 18th July 2010, 19:20

Funny. I have to dissagree with every single point you've made.

I religiously ran the Cyrox on the back of my VJ21's (I've owned 3 of them) and found them to be without a doubt mint. Especially in winter where you tend to encounter a few wet roads. Only dry weather tyre I prefered was the Yokohama 003. Now THERE was a tyre but about 7 times the Bridgestone price. Horses for courses.

**boman** · 18th July 2010, 19:54

Originally Posted by trademe900

Just want to warn people not to buy the Bridgestone Cyrox tyre.

This has to be the worst piece of shit ever made and bridgestone should be ashamed. Of course everyone feels the rear sliding from time to time and I have put a few down recently to what I thought was cold weather and hard to spot slippery surfaces but today something happened that brought me to my senses...

Tyres warm, lower pressures to bring heat into them, fairly good weather, going around a smooth well surfaced bend at about 60kmh, not turning fast at all, absolutely nothing special with the lean angle... rear end just starts coming around drifting. A real in helmet 'woah shit!' moment.

I have heard Vtec talk about the drifting abilities of the cyrox but never though they could be this shit. Even with shitty stock GN250 tyres i have never had close to such an experience. Stay away from them, they are fucking dangerous...

And how old are these tyres you are riding on? Age does evil things to tyres.

**racefactory** · 18th July 2010, 21:56

I don't actually know but there is a shitload of tread on them... seem almost new.

**AllanB** · 18th July 2010, 22:03

Bowman, saw the avatar, no idea what this thread is about anymore ........

**racefactory** · 18th July 2010, 22:34

It's not about riding cock.

**MSTRS:Me** · 19th July 2010, 08:58

Originally Posted by trademe900

I don't actually know but there is a shitload of tread on them... seem almost new.

Amount of tread is no indication of the tyre's age, just it's use. Have a look on the sidewall for the Julian code...4 numbers inside an elongated circle. Tell us what they are

**mouldy** · 20th July 2010, 17:27

Cyroxs' Bridgestones budget radial for small bikes , seen them worked quite hard round Puke on an NC30 but wouldn't put them on a Gixxer 7 but they I didn't think they made a 180 so have you got an old J then ?

**Ronin** · 20th July 2010, 17:41

Originally Posted by MSTRS

Amount of tread is no indication of the tyre's age, just it's use. Have a look on the sidewall for the Julian code...4 numbers inside an elongated circle. Tell us what they are

Juilian code

**p.dath** · 20th July 2010, 17:56

Originally Posted by MSTRS

Amount of tread is no indication of the tyre's age, just it's use. Have a look on the sidewall for the Julian code...4 numbers inside an elongated circle. Tell us what they are

+1. Tyres older than 7 years probably shouldn't be used - but they are still sold as "new" since they have never been used.

Been a lot of people having accidents in the USA where the sale of "old" "new" tyres is more common.

**p.dath** · 20th July 2010, 17:57

This articles says how to read tyre age, and the danger of using "old" tyres, even if they have never been used.

http://abcnews.go.com/Video/playerIndex?id=4826897

**p.dath** · 20th July 2010, 18:03

Originally Posted by trademe900

Tyres warm, lower pressures to bring heat into them, fairly good weather,

This is way outside of my area, so please excuse my ignorance.

When at the track they tell us to deflate our tyres, but that is when we are travelling at many hundreds of km's per hour, accelerating as hard as we can, and braking as hard as we can. We are basically (in my case at least) pushing a street tyre much harder than what it is on the street. So the tyre is running hotter than would it would normally, so you have to compensate by lowerng the pressure to begin with.

My impression is that for normal road use, if you are not accelerating or braking hard continuously (as in applying forces along the length of the bike), you should run at the manufacturer rated pressure. They allow for the tyre to get to a certain temperature, so that it has a certain level of inflation.

If your deliberately underflating the tyre on the street then it may never get inflated to the correct pressure, because there is not enough force to get it hot enough. Sure it may heat faster, but may never get to the intended pressure it was designed for.

As I said, this is too far outside of my area, but do you think underflating the tyre could have impacted its performance while travelling in the 60km/h area you indicated? I would imagine the tyre wouldn't be very hot at all to touch in those circumstances.

**Robert Taylor** · 20th July 2010, 18:45

I question such a statement when there is so much relevant information that has not been forthcoming to substaniate bagging the product.

Tyre pressures?

Age of tyres ( as has been questioned )

Suspension setup ( which has more of an impact on ultimate grip and rider feel than many people realise )

And a myriad of other factors that knowledgable and experienced readers may come up with.

A few years back we had a customer who complained that the tyre we fitted to his bike was faulty. We had recieved only the wheel to change the tyre. We insisted on checking the bike and found that the twin shock rear end had lost much of its damping and that the bike was using up 70% of its rear stroke as it was being ridden two up most of the time with some luggage on predominantly rough roads. The suspension was therefore frequently bottoming out and frequently overloading the tyre.

He got his way with a replacement at manufacturers cost as he was prepared to make a lot of noise to anyone that listened even though it was proven beyond all doubt what the root cause of the problem was.

My point being that tyre problems are very often caused by suspension. Also changing to a different brand of tyre can often dictate a quite different suspension setup.

It is my opinion that tyre manufacturers are all too often unfairly maligned.

**vtec** · 20th July 2010, 19:15

Horses for courses. Had a BT090 on the front and a Cyrox on the rear the first time I ever went on the track, at Pukekohe on my CBR250RR about 5 years ago. Gave good notice of slides but not much grip. Probably fine for most road users on the road. I only run good stuff on sportsbikes now, because I don't like having to allow for average grip.

**Owl** · 21st July 2010, 07:14

Originally Posted by p.dath

We are basically (in my case at least) pushing a street tyre much harder than what it is on the street. So the tyre is running hotter than would it would normally, so you have to compensate by lowerng the pressure to begin with.

Sounds a little "back to front" to me? Less pressure should = more heat.