September 25th, 2018, 07:40 AM | #1 |
ninjette.org newbie
Name: Phiipp
Location: Rocky Mountains
Join Date: Sep 2018 Motorcycle(s): Ninja 250R Posts: 4
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Tire Wear Help
Posted this on Reddit without much response. Need help reading the wear on my tires. This is on a big, 250CC monster of a bike at Colorado's High Plains Raceway, running at a podium contending pace in the 250 production class (there's only like 5 other bikes though...).
Done a lot of learning via suspension and tire resources (eg. Dave Moss and Life at Lean), but a lot of that deals with bikes that actually have power to work the rear tire accelerating out of turns and weight to work the front tire during braking. 2009 Ninja 250 with:
Tires:
Front suspension related wear I'll attempt to tune during the off season (looks like I need a bit less rebound with the lip on the leading edge), can't do the rear without upgrading (but seems I need a teeny bit more rebound due to lip on trailing edge). Ignoring suspension related wear, I'm looking for help on pressure related wear. Off warmers (180F front, 190F rear), I set my tires to 30psi front and 26psi rear which is on the low-side of the recommended Pirelli range for SCs. After a session with track temps about 110F, my tire temps drop to 130F front and 150F rear, pressures remain the same. I set pressures low because it seems like I can't keep my tires hot during a session (158-176°F is Pirelli website's displayed optimum temp range). I'm not getting the perfect "sandy beach" wear and because my 250 doesn't have power, I can't really tell if I'm hot tearing. Help! https://imgur.com/a/CWybtsm |
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September 25th, 2018, 06:08 PM | #2 |
The Corner Whisperer
Name: Chris (aka Reactor)
Location: Northern KY
Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much.
MOTY 2015, MOTM - Nov '12, Nov '13
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Welcome Phiipp!
My gut feeling says to put 1 more lb of pressure in em, but that is wish/wash at best. Overall, your bike can be perfect and your throttle control can cause the tire ware you are seeing. Ride it again and see if you see the same thing. Imho, your wear looks 100% normal and well set for podium contention. Always suspect the rider FIRST! And these tires last an entire season on a well set up bike and.... different tracks/weather conditions/rider aggressiveness will show at the end of the day. Good luck! Go fast!
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Goal: Shake A Million Hands | Look through the corners | Track Day Prep | Closest track? | The Mid-Ohio School |
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September 25th, 2018, 09:05 PM | #3 |
ninjette.org newbie
Name: Phiipp
Location: Rocky Mountains
Join Date: Sep 2018 Motorcycle(s): Ninja 250R Posts: 4
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September 25th, 2018, 10:44 PM | #4 |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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I say lay off the brakes!!
They do nothing but wear out your tyres and give you slower lap-times! One of my friend's front brake-lever fell off his bike at beginning of A-group session at Buttonwillow couple weekends ago. He managed to get fastest times ever! We later found brake lever in belly-pan and put it back on. Guess what? His times increased back to earlier levels! |
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September 26th, 2018, 08:44 AM | #5 |
ninjette.org newbie
Name: Phiipp
Location: Rocky Mountains
Join Date: Sep 2018 Motorcycle(s): Ninja 250R Posts: 4
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September 26th, 2018, 09:55 AM | #6 |
ninjette.org sage
Name: Timm
Location: West Seneca, NY
Join Date: Oct 2015 Motorcycle(s): 2006 1050 Speed Triple, 2010 250 Ninja racebike, YZF320RR? Racebike Posts: 556
MOTM - Nov '15
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Personally I don't see anything wrong with your tires. The rubber is not "tearing" at all. What you see me is simply small rolls of melted rubber. The surface of the rubber beneath that is actually pretty smooth. I'd be pretty happy with my tires looking like that.
If you want meaningful tire temperatures then they need to be done in real time. Otherwise, the cool-off lap and the rest of the time you take getting back to your pits will have a huge effect on temps causing them to be lower than they actually were on track at race pace. Think of the opposite effect: The rule of thumb for warming up cold tires is two laps of progressively stressing your tires to get them to come up to race temps so why wouldn't we expect the tires to shed a significant amount of heat as we slow down? Just a thought. |
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September 26th, 2018, 12:27 PM | #7 | |
ninjette.org newbie
Name: Phiipp
Location: Rocky Mountains
Join Date: Sep 2018 Motorcycle(s): Ninja 250R Posts: 4
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Quote:
Next round out, I'll have someone measure my tires from the hot pit. My gut feel is to try this out next time out. If I see some different wear, another data point for me to understand. |
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