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White79bu
| Posted on Monday, September 29, 2008 - 08:28 pm: |
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I did my third track day with the 1125r today. I had my speedo taped up and I was running around 9500-10000 rpm in 5th gear. Does anybody know what kind of speed that is? I can't do track days without the speedo being taped up. It messes with my head to much. |
Fresnobuell
| Posted on Monday, September 29, 2008 - 08:32 pm: |
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Not sure but I think its freakin fast. |
Dtx
| Posted on Monday, September 29, 2008 - 08:34 pm: |
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Oh wow...yeah thats a fast track. Probably about 140. |
White79bu
| Posted on Monday, September 29, 2008 - 08:47 pm: |
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It was at Mid-Ohio going down the back stretch. The scary thing is is that I could have very easily gone faster. But I am recovering from some type of flu bug and didn't feel like pushing the bike or myself real hard. It was nice being able to keep up with all of the 1000cc I4 bikes. I even passed a few of them. |
Brent1125russ
| Posted on Monday, September 29, 2008 - 09:12 pm: |
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On my first trackday with the 1125r, I touched 160 going into turn one at Spokane County Motorsports Park.....it took a couple weeks for me to stop smiling! |
Kttemplar
| Posted on Monday, September 29, 2008 - 09:18 pm: |
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based on this spreadsheet from another poster on this board http://www.badweatherbikers.com/buell/messages/290 431/397207.html in 5th 9500rpm=144mph & 10000rpm=152mph |
Pariah
| Posted on Monday, September 29, 2008 - 09:47 pm: |
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The main thing that freaks me out about going so fast (>100mph) on a bike (versus a car) is what happens if a tire blows out? Even in a car, the result can be catastrophic. On a bike... yikes. I know the MotoGP and Superbike racers go this fast regularly, but they've got fresh tires and a crew that looks them over... so make sure you look over your carcasses carefully. Sorry for the somber comments... I'm still at work, and that probably has something to do with it. |
Fresnobuell
| Posted on Monday, September 29, 2008 - 09:53 pm: |
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I guess in a way it is good that the lifespan of a moto tire is only 4-6 months for most people. Keeps the rubber fresh! |
Pariah
| Posted on Monday, September 29, 2008 - 10:03 pm: |
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Here's a tire blow out at around 150mph (maybe better examples, but this is pretty interesting): http://www.youtube.com/watch?v=WIEEJmJ36H4 |
D_adams
| Posted on Monday, September 29, 2008 - 11:07 pm: |
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Actually, if the speedo was correct at about 320 kph, then he was doing about 190 mph or so. |
Slypiranna
| Posted on Monday, September 29, 2008 - 11:14 pm: |
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High 140's to Low 150's...mph, pending "air" and to think there is still another cog on that shift drum! |
Slypiranna
| Posted on Monday, September 29, 2008 - 11:17 pm: |
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Forgot to add... How do you haul that wheel barrel in between your seat and tank? !!!! |
Xb9
| Posted on Tuesday, September 30, 2008 - 03:35 pm: |
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I ran the Buell Inside Pass trackday at Mid-Ohio Sept.3, then ran that evening with the KTM crew so I put on a lot of track miles that day. The Michelin slicks I was running that day - I knew I had worn out the front on the right side by the end of the day, and as usually I look over the tires frequently. So I go to take the tire off the rim last weekend to put another on, and notice a nice 1" split in the tread just off center. First thing I thought of was when I was looking at the speedo on the back straight and saw 158. I feel lucky and fortunate. I gotta keep a better eye on the center part, not just the sides.....always remind yourself that this is not a badminton game. Preflight and inflight checks are a must. |
Rfischer
| Posted on Tuesday, September 30, 2008 - 03:42 pm: |
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Years ago, Yvonne DuHamel on a Yamaha at Daytona had a rear tire disintegrate at nearly 200 mph. Unbelievably, he did not go down. But that was Yvonne DuHamel...a mere mortal would have been chum in the infield lake. |
Chadhargis
| Posted on Wednesday, October 01, 2008 - 11:31 am: |
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Why would you tire "blow out"? Unless it was grossly under inflated or old as dirt, typically motorcycle tires don't "blow out". If punctured, they lose pressure slowly which will induce a "loose" feeling in the bike. You'll know it when you feel it. If the tire is worn, you will begin to spin the rear up or push the front a bit. If you're riding smoothly, and not whacking the throttle open and grabbing the brakes, then you should feel the "slip" and be able to make adjustments for it. During high speed riding, you are primarily going in a straight line, and when you are straight up and down, and full throttle, there is very little stress on the front tire, but the rear tire is under stress. If it begins to fail, you should have your front tire free to brake and get off the track. |
Brent1125russ
| Posted on Wednesday, October 01, 2008 - 02:58 pm: |
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Tires typically blow out only when the max speed they are designed for is exceeded and the structural stability of the tire is compromised by the extreme centrifugal forces. The other times you might see a 'blow out' would be if the tire was overinflated or overloaded, or something causes enough damage to the tire for it to loose structural integrity. |
Pariah
| Posted on Wednesday, October 01, 2008 - 03:00 pm: |
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The faster the tire spins, the more stress there is on the carcass... it's centrifugal force (increases as the square of the speed). At high speeds, there can be enormous stress on the tire--- tiny imperfections in the tire could cause a blow out if they are stressed enough. You're putting a lot of faith in a manufacturer's ability to make a tire that is free of defects whenever you go fast... |
Xb9
| Posted on Wednesday, October 01, 2008 - 03:06 pm: |
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Any idea how much stress is on the front tire, near race pace, when you grab the brake lever at 158mph and you're trying to get it hauled down to about 45-50mph in the shortest distance possible? What is more powerful - the engine or the front brake? Try this experiment: Measure the distance it takes to go from 0-150 full throttle. Now measure the distance it takes to go from 150-0 full application of the front brake. No contest. "If punctured, they lose pressure slowly" That's a pretty good assumption on the street, but not always the case at racetrack speeds. I agree, modern tires are very good and "blow outs" rarely happen. In this case I am referring to, it looks like a defect. It will be going back to the Michelin rep at the track for their analysis. |
Xb9
| Posted on Wednesday, October 01, 2008 - 03:09 pm: |
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+1 Pariah |
Pridayr
| Posted on Wednesday, October 01, 2008 - 03:57 pm: |
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Well, as we all do every day... you can manage risk, but you can't eliminate risk. Rob |
Xb9
| Posted on Wednesday, October 01, 2008 - 07:37 pm: |
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Ply separation I believe. about 3/8" deep. |
Pridayr
| Posted on Wednesday, October 01, 2008 - 10:04 pm: |
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Awww man! You can't even see the air inside yet! That's got another 2-3 track days left in it... Rob |
Cutty72
| Posted on Monday, October 06, 2008 - 09:24 pm: |
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Redline 5th gear is 155mph indicated. so at 10K, about 150ish. |
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