Pirello to Bridgestone (review)

zoran zv30 at sbcglobal.net
Wed Aug 20 11:57:25 PDT 2008


if anything suspension needs little stiffening.


Zoran Vujasinovic
Twin Works Factory
775-786-4881
www.twfracing.com
----- Original Message ----- 
From: "Jo Rhett" <jorhett at fastlizardracing.com>
To: "Suzuki SV650 Mailing List" <sv650 at micapeak.com>
Sent: Wednesday, August 20, 2008 9:33 AM
Subject: Re: Pirello to Bridgestone (review)


>I am more wondering what if any changes you recommend when running on  a 
>harder carcas tire?
>
> On Aug 19, 2008, at 10:14 PM, zoran wrote:
>
>> you asking me if there is other tires than michelin :)
>> I know few guys that tried bridgestones and will not use them again.
>>
>>
>> Zoran Vujasinovic
>> Twin Works Factory
>> 775-786-4881
>> www.twfracing.com ----- Original Message ----- From: "Jo Rhett" 
>> <jorhett at fastlizardracing.com
>> >
>> To: "Suzuki SV650 Mailing List" <sv650 at micapeak.com>
>> Sent: Tuesday, August 19, 2008 10:07 PM
>> Subject: Re: Pirello to Bridgestone (review)
>>
>>
>>> I have some ride height adjustment in the shock as well.  When I  tried 
>>> that on the Pirellis I just lost traction, though.   We'll  see.
>>> Any considerations, Zoran?  You're more used to the harder tires...
>>> On Aug 19, 2008, at 9:37 PM, Randy Grein wrote:
>>>> Check the swingarm angle - you might be able to increase rear  height 
>>>> instead.
>>>> Randy Grein, WMRRA #41
>>>>
>>>> On Aug 19, 2008, at 9:31 AM, Jo Rhett wrote:
>>>>
>>>>> I'm not certain I can.  With the GSXR front it's pretty low, and  a 
>>>>> couple millimeters will probably have me dragging the belly  pan. 
>>>>> I'll give it a try though.
>>>>>
>>>>> On Aug 19, 2008, at 12:07 AM, Randy Grein wrote:
>>>>>> Thanks for the review Jo. You might try dropping the front a   couple 
>>>>>> of millimeters to get the front to track properly again  -  just an 
>>>>>> idea, I've not heard the Dunlops were prone to  understeer  but I've 
>>>>>> not considered them for about 4 years -  since a friend  wore out a 
>>>>>> front in 1 race.
>>>>>> Randy Grein, WMRRA #41
>>>>>>
>>>>>> On Aug 18, 2008, at 11:32 PM, Jo Rhett wrote:
>>>>>>
>>>>>>> So Friday at Infineon was just me having fun, as I wasn't  going  to 
>>>>>>> race that weekend.  All morning I was having trouble  lighting  up 
>>>>>>> the rear, nice fun slides out of every fast corner  - 2, 3, 3a,  4, 
>>>>>>> bottom of the Carousel, you name it.  Not  surprising given  that I 
>>>>>>> had 3 race days, 4 practice days and 3  track days on the  set of 
>>>>>>> tires.
>>>>>>>
>>>>>>> At lunch I replaced the soft/soft Pirellis with soft/medium 
>>>>>>> Bridgestones just to have some fun.  I've got 5 trackdays  before 
>>>>>>> the final WERA race, so why not fart around and see how  I like  the 
>>>>>>> tires?
>>>>>>>
>>>>>>> I actually dropped out of the A Race group figuring that   switching 
>>>>>>> tire brands would slow me up for the rest of the  day.   I went out 
>>>>>>> behind a moderately fast guy to pace myself  and not  get stupid, 
>>>>>>> but felt so good I passed him entering the  Carousel  and never saw 
>>>>>>> him again.  My 4th lap on the new tires  was 2/10ths  of a second 
>>>>>>> faster than I did on the Pirellis all  morning (as  well as all 
>>>>>>> succeeding laps).
>>>>>>>
>>>>>>> First impressions:
>>>>>>>
>>>>>>> * the profile is different, and my first thought was that the 
>>>>>>> tires actually "rolled better".   Especially on corner exit,  the 
>>>>>>> bike seemed to be moving faster right away.
>>>>>>>
>>>>>>> * On corner entry the tires held awesome and solid.  I really  had 
>>>>>>> to work to get the front to push, and I never successfully  spun  up 
>>>>>>> the rear.
>>>>>>>
>>>>>>> * Just like the Pirellis, once I had turned in the bike was   stable 
>>>>>>> and solid, completely reassuring.
>>>>>>>
>>>>>>> However, it wasn't all good. My perfect suspension from the 
>>>>>>> morning was gone.
>>>>>>>
>>>>>>> * The bike seesawed mid-corner (fixed by adding rebound to the 
>>>>>>> front and taking some out of the rear)
>>>>>>>
>>>>>>> * The front under shuddered under hard braking, fixed by  adding 
>>>>>>> rebound to the front but it came back as soon as I went  faster 
>>>>>>> again.
>>>>>>>
>>>>>>> * The tires exhibit the Dunlop "drift".   Unless you push the 
>>>>>>> front, a Pirelli will exit the corner *exactly* where you  think  it 
>>>>>>> should.  The Bridgestones exhibit the Dunlop Drift  where you  find 
>>>>>>> yourself just a foot wider than you expected  exiting the  corner, 
>>>>>>> but you didn't push the front.  The whole  bike just ...  drifts a 
>>>>>>> bit.  I hated this on the Dunlops  (which is why I went  to Pirelli 
>>>>>>> in the first place) but this  appears to be evident in  the 
>>>>>>> Bridgestones too.  *shrug* For  now I'm just riding it.
>>>>>>>
>>>>>>> Next stop: Miller Motorsports Park, Utah.  I'm returning after  a 
>>>>>>> fairly successful weekend on Pirellis there, we'll see how  the 
>>>>>>> Batlax holds up.
>>>>>>>
>>>>>>> -- 
>>>>>>> Jo Rhett /  velociRaptor Racing
>>>>>>> #553 WERA / AFM
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>> -- 
>>>>> Jo Rhett /  velociRaptor Racing
>>>>> #553 WERA / AFM
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>> -- 
>>> Jo Rhett /  velociRaptor Racing
>>> #553 WERA / AFM
>>>
>
> -- 
> Jo Rhett /  velociRaptor Racing
> #553 WERA / AFM
>
>
>
>
> 



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