Pirello to Bridgestone (review)
randygrein at comcast.net
Tue Aug 19 00:07:31 PDT 2008
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
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
> 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
> * 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
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