Should I get new tires? - Kawasaki Ninja 300 Forum
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post #1 of 8 (permalink) Old 09-01-2016, 01:13 PM Thread Starter
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Should I get new tires?

I'm still fairly new to track days and I'm wondering if I should get new tires or if these still have some life left in them. They're DRIIs.

I've done about 5-6 track days on them and I'm currently running B group.

Let me know what you think.

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post #2 of 8 (permalink) Old 09-01-2016, 01:30 PM
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They still look fine to me, as long as you're happy with the grip levels then I wouldn't change them yet

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post #3 of 8 (permalink) Old 01-11-2018, 12:51 AM
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Lots of meat left. I'd keep using them for track days myself.
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post #4 of 8 (permalink) Old 01-11-2018, 04:34 AM
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Yep, keep going. Your lucky in that the 300's aren't so hard on tyres. I only get 4 maybe 5 meetings out of a back tyre on my SV650 (Dyno'd at 75 RWHP). I cant imagine what a 200HP bike does to a back tyre when racing!
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post #5 of 8 (permalink) Old 04-10-2019, 01:39 AM
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Quote:
Originally Posted by Kiwi rider View Post
Yep, keep going. Your lucky in that the 300's aren't so hard on tyres. I only get 4 maybe 5 meetings out of a back tyre on my SV650 (Dyno'd at 75 RWHP). I cant imagine what a 200HP bike does to a back tyre when racing!
Just curious as to why tire wear gets exponentially worse as you go up in class? Is it the top speed? Weight? HP? Torque? Acceleration? This is the second time I've heard this and one of the influences for me to stick with the 300 as my track bike. The cost in consumables and maintenance just seems disproportionate to the performance for bigger bikes IMO - especially in your SV650 example which I'm looking into as my #2 track option. Just thought thought it would be more linear.
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post #6 of 8 (permalink) Old 04-10-2019, 02:35 PM
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Originally Posted by Shaxy View Post
Just curious as to why tire wear gets exponentially worse as you go up in class? Is it the top speed? Weight? HP? Torque? Acceleration? This is the second time I've heard this and one of the influences for me to stick with the 300 as my track bike. The cost in consumables and maintenance just seems disproportionate to the performance for bigger bikes IMO - especially in your SV650 example which I'm looking into as my #2 track option. Just thought thought it would be more linear.
Mostly itís acceleration (hp/torque) and braking, plus adding weight doesnít help. The more power you have, the more demand on the rear tire to not brake loose. This generates a ton of heat, which transfers to melting rubber. Running much faster speeds, means using a lot more brake into corners. This also generates heat and melts the rubber. Doing this over and over and itís very easy to wear out tires.

On the little ninja, with 30ish hp, you are not going to spin up the tire or lose traction (under normal conditions). Then, Without a ton of power, you donít want to lose speed, so you carry your momentum into the corners. The lack of hard braking keeps the rubber on the tire, too.

I hope I explained that decent.
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post #7 of 8 (permalink) Old 04-13-2019, 08:01 AM
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Originally Posted by Rttoys View Post
Mostly itís acceleration (hp/torque) and braking, plus adding weight doesnít help. The more power you have, the more demand on the rear tire to not brake loose. This generates a ton of heat, which transfers to melting rubber. Running much faster speeds, means using a lot more brake into corners. This also generates heat and melts the rubber. Doing this over and over and itís very easy to wear out tires.

On the little ninja, with 30ish hp, you are not going to spin up the tire or lose traction (under normal conditions). Then, Without a ton of power, you donít want to lose speed, so you carry your momentum into the corners. The lack of hard braking keeps the rubber on the tire, too.

I hope I explained that decent.
You did. I just did my second track day in the wet/dry and never really felt my tires want to break loose at all. I'm starting to see why it's an exponential increase and not more of a linear increase for demand on tire friction. The ninja can fly through corners. There was a junior pro girl out there on a 400 lapping everyone. Her engine is SCREAMING every time she passes but I was able to see that her breaking distance is way shorter and cornerspeed way faster. Makes sense that shes on the breaks hard but for less time before she sets the speed and turns it in. We usually accelerated out at the same pace though. My coach also mentioned to not treat the 300 like a 1000 and not try and point and shoot or diamond out a corner. He actually said I have too late a tip in point, and that the smaller bikes can rail around on a tighter radius and still hit the apex, so attack the corner earlier. I always seem to have way to much track left after exit.
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post #8 of 8 (permalink) Old 04-13-2019, 11:37 AM
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Originally Posted by Shaxy View Post
My coach also mentioned to not treat the 300 like a 1000 and not try and point and shoot or diamond out a corner. He actually said I have too late a tip in point, and that the smaller bikes can rail around on a tighter radius and still hit the apex, so attack the corner earlier. I always seem to have way to much track left after exit.
Ugh. Yes. It took me a long time to pound it into my skull that Iím not on a 1000.

I like what one of my instructors said very early on: you pay to use the whole track, so you might as well use the whole track.

Sounds kind of dumb, but itís very true.
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