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Old 06-22-2009, 02:58 PM   #1
cdill35
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Question Rear Wheel Spin

My first 25ish track days I never spun my rear wheel. The last 3 or 4 track days I have been experiencing quite a bit of it. It is not scary nor unpredictable but I have been trying to shave a second or so at the tracks I go to.

I know alot of the key is braking later and getting on the gas sooner. I feel like I am pretty good at braking, that is where I catch most people. I have been braking late and deep.

I was talking to some people about teh wear line (the portion of the tire that shreads and can tell when I am getting on the gas) and it is mid way between the edge and center. I was told that I need to move that line over and getting on the gas sooner will do that.

Therein lies the problem. So my question is this....

Do you guys that run sub :45 at MSRH, sub :55 at TWS (Texas World Speedway) and sub :25 at MSRC get wheel spin all the time?

Is it a matter of learning to deal with it? Control it? Is it a body position issue?

Or do you just smoke em up!
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Old 06-22-2009, 03:05 PM   #2
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can't help you.. i'm slow and only ran low 30s at msrc last time i was there.. but i had no rear wheel spin... getting the front to stick and track, thats another story and also my excuse for only running 30s


and i did notice you puttin some black strips down at cresson when you were infront of me through boothill

back when i was quick though... sliding was just part of the game
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Old 06-22-2009, 03:08 PM   #3
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I spin my rear 1-2 times every Trackday. One of my advantages of being light/small on a 600 is how fast and hard I can get on the throttle after the apex. Sometimes I gas it to much causing my rear to just spin out due to the torque of the bike. Example- T12 at TWS (Texas World Speedway) this weekend I was trying to catch up to someone and I gunned it through the corner, sliding the rear-scaring the outta me! But, it seams like everytime I do it I get a little bit more comfortable it being loose.

Now I'm only running ~1:58-9 at TWS (Texas World Speedway) but it's becuase I brake to early and when I go fast I somtimes take wide lines.


Good thread
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Old 06-22-2009, 03:16 PM   #4
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I am slow and run street tires but I spun my back tire.
I was so happy! Maybe you should learn how to drift?
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Old 06-22-2009, 03:20 PM   #5
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I get spin from time to time....when it happens I ease off the throttle. If I'm that hard on the gas, I'm pushing too hard or need new tires. The Stones are predictable so even when it "slides", it feels controlled. When it happened to me on street tires, it landed me on my after a high side. Needless to say, be smoother. J/K...I'm so ready for more track time...only 3 months to go. lol
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Old 06-22-2009, 03:25 PM   #6
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I understand that I can ease off the throttle or stay easy with it, but I am trying to shave seconds here. I am trying to get on the gas sooner but I am experiencing wheel spin, often, when I do.

Just to clarify, I'm not really asking what to do when the wheel spins, I am asking is wheel spin something that is normal when running at or below those times I mentioned in the first post.

I rarely if ever experienced wheel spin when I was running a second or two above those times.
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Old 06-22-2009, 03:28 PM   #7
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Good thread, will keep an eye on this one. Im scared shitless to hit the gas exiting, my biggest flaw of many.
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Old 06-22-2009, 03:35 PM   #8
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have you tried dropping a pound of air in your back tire?

how old/new is the tire?

could also be a suspension issue. next time give Patrick a shout and let him know what the bike is doing....but try taking a pound of pressure out of the back tire first, then see what happens. if it continues or the tire starts to tear, put the pressure back up to normal, and get ready to turn some knobs on the suspension.

also compound choices on the race tires can make a difference. if you were running softs in the heat we had this past weekend, that could also be a cause. with the weather being as hot as it is lately, a hard rear would've probably been a good choice.
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Old 06-22-2009, 03:41 PM   #9
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I just switched from med. to hard. Patrick and I adjusted a few things a couple of track days ago. Maybe we need some more.

Tony...do you spin your sixxer regularly?
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Old 06-22-2009, 03:45 PM   #10
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yeah, i experienced more wheel spin than normally yesterday, but i was also on a soft rear.....i think the heat just caused the tires to get greasy as the day went on. the tires were hookin up great before lunch, after that....it was slide city, which is why i jumped on the SV650 afterwards.

especially exiting turn 2, and coming out of the gravity bowl, the wheels were just sliding like crazy going all the way up the hill to turn 8.
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Old 06-22-2009, 03:47 PM   #11
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other than that, my wheels only spin up when they are overdone, but they usually look like worn down slicks with tread in the center when that happens.
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Old 06-22-2009, 03:50 PM   #12
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So... less slide = more speed?
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Old 06-22-2009, 03:54 PM   #13
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what do you guys think of the Pirelli dual compound tires? Are they good enough for the track?
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Old 06-22-2009, 03:56 PM   #14
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So... less slide = more speed?
Less slide/spin = more acceleration and lower lap times.
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Old 06-22-2009, 03:57 PM   #15
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what do you guys think of the Pirelli dual compound tires? Are they good enough for the track?
Sure.

now go make your own thread.
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Old 06-22-2009, 03:58 PM   #16
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Quote:
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Sure.

now go make your own thread.
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Old 06-22-2009, 04:07 PM   #17
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Quote:
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Less slide/spin = more acceleration and lower lap times.
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Old 06-22-2009, 04:09 PM   #18
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Quote:
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what do you guys think of the Pirelli dual compound tires? Are they good enough for the track?
yes, they are more than good enough for the track.

also depends on skill level though.
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Old 06-22-2009, 04:19 PM   #19
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....not on a 600, but I get the back sliding somewhat often at the trackdays, yesterday was worse.

I run a medium 003 rear going out at 27psi and coming in at 30psi yesterday. I am not in the 55 range you mentioned at TWS (Texas World Speedway), but running between low 58's and low 2 min times I get a good deal of spin but it's very short lived.

I am not an expert at any of this to begin with, but I feel my braking sucks and I tend to try and make up for it on my drive out of each turn.
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Old 06-22-2009, 04:23 PM   #20
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yes, good thread.

i would also agree that if you're spinning the back tire...you have reached the max handling ability of that particular bike, on those particular tires, with that particular suspension, with your particular skills, in that particular turn at that particular speen and in that particular weather...in reality there are most likely a trillion different scenarios that can be put to test.


maybe it's cuz you're running the 750 now Brandt...go back to a 600?
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