Pirello to Bridgestone (review)
randygrein at comcast.net
Tue Aug 19 21:37:05 PDT 2008
Check the swingarm angle - you might be able to increase rear height
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
>>> 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
>>> 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
>>> * 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
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