donkason Posted June 23, 2012 Report Share Posted June 23, 2012 I've done some homework on the web and now I'm more confused. I'm wanting to know what is a good pressure to run on the track. I'm 260 with gear on and ride a Hayabusa so it is a lot of weight. I run 30.5 on the rear and 31.5 in the front and get 2lbs of expansion in the rear and about 1.5 in the front when I pull off the track.Some people run more in the rear than the front which seems odd to me. I assume the rear has more contact, more heat, more expansion, thus less initial pressure is needed. So is it more in the front less in rear or vice versa? Also is the ultimate goal to have the pressures match when up to temperature or should they always be staggered? Quote Link to comment Share on other sites More sharing options...
shadyone Posted June 23, 2012 Report Share Posted June 23, 2012 You'll Get more expansion in the rear because you have more power than ability to turn. I always ran 30 R 30 F and my hot pressure was. 33 r 33 f this was Pilot powers. And also the setting suggested by the tire guy at midohio. You can also change the way the bike handles a little with tire pressure. To little it will feel heavy o much it will feel twitchy. I'd check with the tire guys at the track but it seems you are on the right track. Quote Link to comment Share on other sites More sharing options...
TSB67 Posted June 23, 2012 Report Share Posted June 23, 2012 The goal is to use pressure to manage heat generation and get the tire in its operating temperature range. Less air encourages heat generation, more air resists heat generation. Rule of thumb I was told on sportbike street tires is 10% pressure rise, which anywhere around 30 is basically 3psi. You're close, could probably have run 30/31 or maybe 30/30.5. Varies with the grip level of the track (and how much of it you're actually using).I seem to be in the minority running more in the rear than in the front. Basically it's because I ride the front like a pussy and need to drop the pressure to generate heat, whereas I can use the rear for most of what it's worth. Quote Link to comment Share on other sites More sharing options...
donkason Posted June 23, 2012 Author Report Share Posted June 23, 2012 The goal is to use pressure to manage heat generation and get the tire in its operating temperature range. Less air encourages heat generation, more air resists heat generation. Rule of thumb I was told on sportbike street tires is 10% pressure rise, which anywhere around 30 is basically 3psi. You're close, could probably have run 30/31 or maybe 30/30.5. Varies with the grip level of the track (and how much of it you're actually using).I seem to be in the minority running more in the rear than in the front. Basically it's because I ride the front like a pussy and need to drop the pressure to generate heat, whereas I can use the rear for most of what it's worth.What do you mean by riding the front like a pussy? Is there a riding style that merits the break from the norm? Sent from my SCH-I510 using Tapatalk 2 Quote Link to comment Share on other sites More sharing options...
MidgetTodd Posted June 23, 2012 Report Share Posted June 23, 2012 You didn't mention what tires you run either. All tires are different. Quote Link to comment Share on other sites More sharing options...
donkason Posted June 24, 2012 Author Report Share Posted June 24, 2012 Bridgestone battleaxe BT015. Sent from my SCH-I510 using Tapatalk 2 Quote Link to comment Share on other sites More sharing options...
Moto-Brian Posted June 24, 2012 Report Share Posted June 24, 2012 Rule of thumb on dual purpose tires is 30/30. Busa is heavier and really shouldn't drop. As stated, you look for around 10-12% increase, but only after right off the track hot. Are you track day riding it or for aggressive street use?I'm not real familiar with BStones at the track. But, anyone doing higher psi in the rear tire vs front tire is doing it wrong and most likely not a good source of knowledge. Quote Link to comment Share on other sites More sharing options...
Revelstoker Posted June 24, 2012 Report Share Posted June 24, 2012 Dunlop Q2 and I run 28/30 (rear/front) as a general rule. Quote Link to comment Share on other sites More sharing options...
TSB67 Posted June 24, 2012 Report Share Posted June 24, 2012 What do you mean by riding the front like a pussy? Is there a riding style that merits the break from the norm? Sent from my SCH-I510 using Tapatalk 2I just assume that since I fail to generate much heat in the front tire with a pressure equal to or greater than the rear, I must be "doing it wrong" on corner entry or something. Quote Link to comment Share on other sites More sharing options...
redkow97 Posted June 24, 2012 Report Share Posted June 24, 2012 Dunlop Q2 and I run 28/30 (rear/front) as a general rule.That sounds a bit low for Q2's. I believe I raced at 30 rear, 33 front. Street tires rarely need to be below 30 psi. 30/30 is a safe track pressure for virtually any street tire. The more the tire is biased toward touring, the closer I'd creap to 33 or 34 psi. Quote Link to comment Share on other sites More sharing options...
wht_scorpion Posted June 24, 2012 Report Share Posted June 24, 2012 (edited) I've done some homework on the web and now I'm more confused. I'm wanting to know what is a good pressure to run on the track. I'm 260 with gear on and ride a Hayabusa so it is a lot of weight. I run 30.5 on the rear and 31.5 in the front and get 2lbs of expansion in the rear and about 1.5 in the front when I pull off the track.Some people run more in the rear than the front which seems odd to me. I assume the rear has more contact, more heat, more expansion, thus less initial pressure is needed. So is it more in the front less in rear or vice versa? Also is the ultimate goal to have the pressures match when up to temperature or should they always be staggered?Congrats on running a hayabusa pretty good bike. I run my rear at 34 cold and after riding it will get around 41Front at 36 Edited June 24, 2012 by wht_scorpion Quote Link to comment Share on other sites More sharing options...
Moto-Brian Posted June 24, 2012 Report Share Posted June 24, 2012 That sounds a bit low for Q2's. I believe I raced at 30 rear, 33 front. Street tires rarely need to be below 30 psi. 30/30 is a safe track pressure for virtually any street tire. The more the tire is biased toward touring, the closer I'd creap to 33 or 34 psi.Actually, for track use, we were running 30 front and 27 rear on Q2s with great success. Wear and handling... Quote Link to comment Share on other sites More sharing options...
donkason Posted June 24, 2012 Author Report Share Posted June 24, 2012 Rule of thumb on dual purpose tires is 30/30. Busa is heavier and really shouldn't drop. As stated, you look for around 10-12% increase, but only after right off the track hot. Are you track day riding it or for aggressive street use?I'm not real familiar with BStones at the track. But, anyone doing higher psi in the rear tire vs front tire is doing it wrong and most likely not a good source of knowledge.I'm running it on a track so I don't do aggressive street riding;) so far what I've run has worked well and I don't have any major slippage. The BT015 has been a good all around tire so far but next time I'm going for a more track oriented tire. I may drop to 30/30 and see how that feels. I was figuring since my bike and I are so fat I may need an extra pound or two in there.Thanks on the Busa up wht_scorpion. It is a beast and a lot of fun. Quote Link to comment Share on other sites More sharing options...
QuikAccord Posted June 24, 2012 Report Share Posted June 24, 2012 I've always ran my tires at stock pressure 36f 42r currently running Q2's at this pressure. Should I be running a lower psi? I tend to ride aggressively on the back roads. Quote Link to comment Share on other sites More sharing options...
donkason Posted June 24, 2012 Author Report Share Posted June 24, 2012 I've always ran my tires at stock pressure 36f 42r currently running Q2's at this pressure. Should I be running a lower psi? I tend to ride aggressively on the back roads.I ran 41/41 for the first set of BT015's, manufacturer spec, and they were flat in the middle very quick and I'd spin a lot under heavy throttle, less heat and less contact patch. I'd probably drop the rear down to 38 and see how the bike reacts. 42 is pretty high if your not riding 2up. I run 38f/37r for street now.How do your Q2's feel at that pressure? Quote Link to comment Share on other sites More sharing options...
QuikAccord Posted June 24, 2012 Report Share Posted June 24, 2012 They feel a lot better than the stock qualifiers I had. I feel a lot more confident on them. Quote Link to comment Share on other sites More sharing options...
ohdaho Posted June 24, 2012 Report Share Posted June 24, 2012 Actually, for track use, we were running 30 front and 27 rear on Q2s with great success. Wear and handling...I'll have to try those pressures next time at the track...I was told by Dunlop guys to run 32-34 Front and 30-32 Rear. Last time I was at Putnam i ran the low end of that range and felt fairly good. Quote Link to comment Share on other sites More sharing options...
redkow97 Posted June 24, 2012 Report Share Posted June 24, 2012 I'll have to try those pressures next time at the track...I was told by Dunlop guys to run 32-34 Front and 30-32 Rear. Last time I was at Putnam i ran the low end of that range and felt fairly good.The 33/31 I posted was also direct from a Dunlop vendor. I wrote it in my toolbox because I got sick of forgetting and having to ask. Lower pressures might be better under certain track and weather conditions, but I never got below 28. Not on purpose at least... Quote Link to comment Share on other sites More sharing options...
Moto-Brian Posted June 24, 2012 Report Share Posted June 24, 2012 I'll have to try those pressures next time at the track...I was told by Dunlop guys to run 32-34 Front and 30-32 Rear. Last time I was at Putnam i ran the low end of that range and felt fairly good.Who were the Dunlop guys? This was tested by us with one of the test guys from Buffalo. Quote Link to comment Share on other sites More sharing options...
crazbiker4 Posted June 25, 2012 Report Share Posted June 25, 2012 Hey Mike, Last time (6/4) when we were running in the same group I was running 30-30 in my Q2s and they felt great in the turns. I think next time I am going to check the pressure expansion. PS... I am thinking about running 7/7 or 7/16.... let me know if your thinking about going those days. Quote Link to comment Share on other sites More sharing options...
donkason Posted June 27, 2012 Author Report Share Posted June 27, 2012 Hey Mike, Last time (6/4) when we were running in the same group I was running 30-30 in my Q2s and they felt great in the turns. I think next time I am going to check the pressure expansion. PS... I am thinking about running 7/7 or 7/16.... let me know if your thinking about going those days.I am definitely thinking about running in mid July. Did you get your bike squared up after the crash? I'm trying to hustle up a track bike now since I was dragging the fairing on my Busa. Look at the Galfer sticker and you'll see the rash. Quote Link to comment Share on other sites More sharing options...
crazbiker4 Posted June 28, 2012 Report Share Posted June 28, 2012 I am definitely thinking about running in mid July. Did you get your bike squared up after the crash? I'm trying to hustle up a track bike now since I was dragging the fairing on my Busa. Look at the Galfer sticker and you'll see the rash.Cool, PM me when you think you might go. Are you looking for a liter bike or 600? I have seen a bunch of 600s for sale in the c-bus area. Well my bike was in pretty decent shape after my wreck, the only damage was some scraps on the right fearing. So after digging out the gravel for 3hrs, cleaning out the throttle tube, front fork alignment check, and giving her a good spit shine she is back to normal with a little rash on the right side. Quote Link to comment Share on other sites More sharing options...
donkason Posted June 28, 2012 Author Report Share Posted June 28, 2012 Cool, PM me when you think you might go. Are you looking for a liter bike or 600? I have seen a bunch of 600s for sale in the c-bus area. Well my bike was in pretty decent shape after my wreck, the only damage was some scraps on the right fearing. So after digging out the gravel for 3hrs, cleaning out the throttle tube, front fork alignment check, and giving her a good spit shine she is back to normal with a little rash on the right side.I'm looking at both types. I'm going to check out a gixxer seven fiddy tonight and I found an 05 R1 track bike for a STEAL, but its in MD. Leaning towards the 750 as to learn how to ride effectively and still have some HP. When I'm slow entering a corner I make up for it on the way out with a a heavy twist. It seems the consensus is to get a 600, but I love me some power:rolleyes:Glad to hear your bike is okay. Nothing worse than tossing your baby in the dirt at speed. You have a story to tell to the ladies at bike night now:cool: Quote Link to comment Share on other sites More sharing options...
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