| Author | Message | ||
     Carbonbigfoot |
Had a set on for about a month now, and have been lamenting the decision since I changed from Pilot 2CT. Been messing around with tire pressures, and making incremental improvements. Last night before I left work, I dropped a bit from the front tire, the back was feeling O.K. Like a lightning bolt (pun intended..) I hit the sweet spot. I am just floored by how neutral, natural, and just about perfect they feel at this moment. I'm waiting for them to cool down for an hour or so and capture the pressures front and rear as my new settings. I will post the results for those interested. Got my baybackbabybackbabyback! R | ||
| Jdugger |
That cold pressure is a worthless measure, btw. You should have measured them at operating temperature, since how you ride, pavement temps, ambient temps and so on are going to have a *SIGNIFICANT* impact on operating pressure vs. cold pressure, and that's what you care about. Go ride again, and if it feels oh so sweet, measure the pressure the instant you get off the bike. That's your target, not the cold number. | ||
| Milleniumx1 |
Coming off years of H-D big twins, you couldn't have convinced me that slight differences in PSI would produce a night and day result. But with my '09R, I'm a believer! What did you run your 2CT's at, F/R? I've been using those since wearing out my OEM rear. I like them, but haven't found what I'd call that perfect set-up just yet. Thanks! Mike | ||
| Carbonbigfoot |
@ Jdugger: Just for reproduceability. So I can air em up in the morning. @ Millenium: I ran em like 2 or 3 psi short of max. May just have been the shape of the tire compensating for my lack of feel. Don't know. R | ||
| Jdugger |
> Just for reproduceability. So I can air em up in the morning. What I'm doing is a poor job of explaining how totally ineffective that approach will be if the "magic spot" is a range of 1-2psi. I get 1-2 psi of increase OFF WARMERS in the summer, and that much decrease on cold days in the winter. So, on the street, where you might be commuting one day, and in the twisties the next, and dealing with ambient ranges of 40 degrees and pavement temp ranges of 60-80 degrees in range, you are looking at probably 6-10psi difference at operating temperature depending on what you are doing with the bike. That's why cold pressures don't really work... it's a starting point, I agree. But, that "sweet" feeling you got, if it's really because of the air pressure being just right, is going to be really hard to get consistently using cold temps. | ||
| Banana_man |
Jdugger : - so how you going to get the pressures right then mate. the only way to do it practically is to check them cold. to check them hot you would have to go out and ride. then check your tyres...adjust.... then go out and ride gain then recheck your tyres.... adjust...etc.... then while you are riding at different speeds the pressures are changing ... so where do you draw the line.... cold settings are as good as any other method.. | ||
| Carbonbigfoot |
What I REALLY need is a central tire inflation system like the H1's had, with a adjustable real time pressure monitoring feedback system that keeps the pressure where you set it all the time. But I'd have to make it out of carbon fiber, transparent aluminium, and unobtanium to keep the rotational inertia down. Hmmmm. That's what sucks about South Texas with our 12 months of riding weather. I don't get to do winter projects. <sigh> The sacrifices I make.... R | ||
| Froggy |
Banana, you can easily install a TPMS and then press a button to see your pressures whenever you want, at whatever speed you want.  | ||
| Tougelabs |
Finding the correct pressure on the new Pures to suit your riding style is some what tough. Reasoning is now with the 3ct the sidewall is much more rigid then the 2ct powers. With that being said I run 30/32 cold on the track usually brings it up to 32/34 depending on track conditions. If your just having fun on back roads etc. and would like to keep comfort in mind run a 28/30. Good luck and be careful dialing in a tire is a gamble and especially the 3cts since they can get super slick when hot. | ||
| Dennis_c |
Froggy how do you get 55mpg? Ride down hill every where you go. | ||
| Jdugger |
Banana, It is absolutely standard practice to use hot temps when setting tire pressure. In fact, my tire vendor doesn't even provide cold temps. Now, for ordinary street riding, I'll side with you that it can be impractical. But that's the rub. If it is getting the pressure "just right", the ONLY way to do that in a reproducible fashion is with operating (hot) temps, not cold temps. The standard delta between cold and hot temps for track days is as much as 10psi. (seriously). Even on the street, it's likely to be 5-6 psi. | ||
| Froggy |
I can confirm what JD says. I can roll the bike out of my 60 degree heated garage during the winter, pressure will be about 40psi. I commute to work, after a good 20 miles on the highway I check again, 45psi. I get to work, park it outside, come back 8 hours later to leave work, it is 22 degrees out, it reads 35psi cold. Hop back on the highway and watch it climb back up into the low 40's on my way home. The system was cheap and easy to install, and takes out any guesswork. Dennis - Yep! | ||
| Kinder |
Use nitrogen to get a more consistent pressure...  | ||
| Jdugger |
> Use nitrogen to get a more consistent pressure... I do. Mostly because I already have a big tank of the stuff in the garage already for the plasma cutter. A tank that costs $35 to fill lasts more than a year's worth of tire changes, and I'm changing a couple of sets a week. Here's the deal with Nitrogen for tires: it's EXACTLY like air unless you draw a vacuum in the tire before the fill and don't use a liquid mounting lubricant. | ||
| Dannybuell |
Froggy - what is that device to the left of the IC? | ||
| Trbulnt |
Danny...its the Tire Pressure Monitoring system he is talking about in this thread, | ||
| Dannybuell |
@Trbulnt Yes, I wanted to know more. | ||
| 1125rcya |
I figured out your problem...you don't ride the bike hard enough to get the tires warmed up (55 mpg lmao) | ||
| Kruizen |
Carbon, so what was the cold pressure, and ambient temp at the time? -Eric | ||
| Carbonbigfoot |
38/38, +/- about .5 psi. Most (all) of what I do is street riding, so I don't get em to heat up to track temps. I will check em "hot" and see what kind of variation there is in my routine. R | ||
| Jgarner99 |
> "@ Millenium: I ran em like 2 or 3 psi short of max." > "38/38, +/- about .5 psi." Carbon, You are running your tires at too high a pressure. The "Maximum Pressure" printed on the tire's sidewall is just that, a maximum safe pressure without risk of bursting. The MAXIMUM has nothing to do with a normal (or "recommended") pressure. Please, take the time to do some homework: Look on Michelin's website, or contact a Michelin distributor for a RECOMMENDED pressure. You can fine-tune from there, by a pound or two at a time, to see if you come up with something you like better. But what you're doing right now is trying to "fine tune" from the WRONG initial numbers! For cryin' out loud, dude! Be careful! | ||
| Carbonbigfoot |
Thanks for the input. Never had a set of tires that I had to think about the pressures before, and this is a fascinating learning experience. Your insight is much appreciated. Back to the original point of this, and I may have not said it loud enough. These tires Friggin ROCK! R | ||
| Stevek1125r |
I put Pilot Pures on my R back in Jan.... Initially the tire pressure were set at 34 F/R. I also did a bunch of changes including a steering dampner... I even wrote a thread about my new experience in tail wagging on the bike under hard braking. Alot of my issue was ME, too much input on the bars under hard breaking, but i did lower the tire pressure on the front down to 32 psi and sure enough the tail wagging under hard braking is virtually gone. I can still induce the wag if i put too much pressure on the bars but not nearly as easy as before... I would say 38psi is way too much, keeping in mind that if thats the COLD rating, then once warm they are over 40psi..(normal riding will raise the pressure 2-3 psi easily) But it is your bike and your riding style...what ever makes the bike feel good for you. i do agree though, that the pressure is too high. | ||
| Kruizen |
Ok so you guys got me thinking, when they installed my PP's they put 38 rear and 42 front. John the MAX on the PP is listed on the tire at "42psi COLD". So I am sure that they have taken into account that the pressure will increase when riden. I had dropped mine to 32 and found them to be sluggish and have slowly been increasing them back up, currently at 36. | ||
| Brumbear |
thats his utility belt  | ||
| Brumbear |
here's the utility watch  | ||
| Carbonbigfoot |
One thing is I'm about 235-245 ready to ride. A bit heavier than some. BTW, I totally dig G-shocks. All I've worn for the last 30 or so years. R | ||
| Mtch |
i asked michelin uk about pressures and they quoted 34F/36R.. but i find it has much turn in with 2 psi more in each end |
