Tire Reading and general tire help - ZX6R Forum
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post #1 of 9 Old 09-02-2019, 04:59 PM Thread Starter
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Tire Reading and general tire help

TLDR: Can someone tell me what kind of tire wear this is? It basically has chunks missing. The track surface is VERY abrasive.

I was at the track this weekend on my Micheline Power RS. I'll be talking about my back tire only as I feel like that's the one I didn't understand well. I'll explain myself:

During the morning portion it was all fine. I was running the tire at 31 psi hot. I wasn't pushing it too hard or anything and the tire seem to respond fine.

During the afternoon, as the track opened up and we had more room I started pushing harder. The Kawasaki Traction Control (KTC) started kicking in mostly when I pin the throttle almost upright.

Towards the end of the day, things started to get a little out of my comfort zone. First, KTC started kicking in mid corners. Then, I almost high-side on a corner. I went back to the garage and decided to drop the pressure to 26psi hot.

I did one more session on 26psi and felt somewhat better but KTC was still kicking in mid-corner and I could feel the back tire slipping a tiny bit sometimes. I'm not expert or anything of course. I just got to Intermediate track day group. I know tire slipping is somewhat normal to a degree (if you control it and are pushing them) but it didn't feel right, specially for the pace I had.

Maybe I'm reaching the limit on the tire, maybe my throttle is sloppy, maybe the tire pressure is too low or high, or maybe Im completely clueless of what's going on. That's why I come here trying to get some help from knowledgeable individuals.

Attached is a picture of the tire in the hope somebody can tell me what type of wear it is. Please keep in mind the surface of the track is very* abrasive.
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post #2 of 9 Old 09-02-2019, 05:58 PM
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IMO the tire pressures are too low for street tires. Street tires get greasy with high heat and low pressures at the track.
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post #3 of 9 Old 09-02-2019, 07:46 PM
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Quote:
Originally Posted by jd41 View Post
IMO the tire pressures are too low for street tires. Street tires get greasy with high heat and low pressures at the track.
Yeah. Those seem even low for cold pressures.
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post #4 of 9 Old 09-02-2019, 08:18 PM Thread Starter
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Quote:
Originally Posted by jd41 View Post
IMO the tire pressures are too low for street tires. Street tires get greasy with high heat and low pressures at the track.
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Originally Posted by Duc995 View Post
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Originally Posted by jd41 View Post
IMO the tire pressures are too low for street tires. Street tires get greasy with high heat and low pressures at the track.
Yeah. Those seem even low for cold pressures.
Thank for the feedback. I mean, apparently from Michelin website cold pressure is in the 27's with the target being 31 (https://motorcycle.michelinman.com/m...ssure/on-track)

I wasn't really aware of them getting "greasy" but I'll definitely look into that. I have been trying to push off getting slicks because of overall cost that comes with having slicks but... Dang, I might have to.
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post #5 of 9 Old 09-02-2019, 08:41 PM
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I would see a suspension tuner to fix that wear

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post #6 of 9 Old 09-03-2019, 05:25 AM
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Originally Posted by jd41 View Post
IMO the tire pressures are too low for street tires. Street tires get greasy with high heat and low pressures at the track.
I think you will find the same for too high of a pressure as well with street tires.
I had an issue a few weekends ago where I was getting a lot of slide on a Q3, I had forgot to adjust pressure for after lunch and the track/ambient had increased a lot from 8 in the morning, my pace also had greatly increased. checked the pressure in the rear (I forget what it was) took a few pounds out and went out and had a much better time.
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post #7 of 9 Old 09-03-2019, 07:22 AM Thread Starter
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Originally Posted by jd41 View Post
IMO the tire pressures are too low for street tires. Street tires get greasy with high heat and low pressures at the track.
I think you will find the same for too high of a pressure as well with street tires.
I had an issue a few weekends ago where I was getting a lot of slide on a Q3, I had forgot to adjust pressure for after lunch and the track/ambient had increased a lot from 8 in the morning, my pace also had greatly increased. checked the pressure in the rear (I forget what it was) took a few pounds out and went out and had a much better time.
When I took some out I had somewhat of a better time. I wouldn't say much better, unfortunately. Although like you said, it got way hotter and my pace was way faster.
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post #8 of 9 Old 09-03-2019, 08:38 AM
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What was the hot pressure when you were having it slide around?
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post #9 of 9 Old 09-03-2019, 01:49 PM
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From the STG Michelin RS page:

https://www.sportbiketrackgear.com/m...r-rs-tire-set/

Track Pressures:
  • Front: start with street pressures and adjust no lower than 31 psi cold
  • Rear: start with street pressures and adjust no lower than 21 psi cold. If you find yourself spinning the rear tire excessively at 21 psi you simply need more grip and should move to a different tire that offers more traction.
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