Tire slipping in corners. - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 26 (permalink) Old 10-14-2020, 10:20 AM Thread Starter
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Tire slipping in corners.

I have a new set of Dunlop sport max roadsmart 2 with right around 1000 miles on them. After returning from the hoon ride I have noticed when I turn aggressively, for me anyway, to the left I feel what seems to be a bit of slipping going on. I didn’t notice this at all during our ride out in Arkansas. The tires are fresh as far as a manufacturer date goes. (20) I’ll attach a pic of the tires in case that helps.

After my ride yesterday I let the tires cool down 2-3hours, the rear was sitting at 34psi, which is lower than I normally run at 40psi.

Would the lower than normal, for me anyway, psi make that much difference? Also seems odd that it only occurs when turning left.

Gen 1, 51,000 miles.

Not really looking to turn this into a tire thread. Thanks.
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post #2 of 26 (permalink) Old 10-14-2020, 11:02 AM
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Ask about tires but don't want a tire thread?
Guess you haven't been on this new thing they call forums.
Lower tire pressure will increase your contact patch which will increase your grip.
Perhaps your body form is off. Transfer more of your weight inside the corner to keep the bike a bit more upright. Perhaps your powering out of the corner a bit too soon or too hard.
Maybe your rebound is set too slow.
Compression too hard?
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post #3 of 26 (permalink) Old 10-14-2020, 11:05 AM
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Very nice "chicken Strip!"

Yeah, being that low, on these lo-pro radials, may give you the feel of a little scooch. But rest assured, unless there was foreign material on the surface, like oil, antifreeze, or sand, it was probably just the lower pressure giving a bigger patch print, on the surface, involving both tire compounds, at the same time, giving you that sensation.

But, I could be wrong! LOL
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post #4 of 26 (permalink) Old 10-14-2020, 11:37 AM Thread Starter
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Thanks for the responses.
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post #5 of 26 (permalink) Old 10-14-2020, 11:42 AM
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Tire slipping in corners.

Benhameen,

If it was my bike, I would want to center-stand the bike, and check that each wheel/tire runs true (no wobble when rotating). That's easy for the rear, but you will need assistants to hold the front wheel up when the bike is on the center stand, while you check that one.

If that much looks good, it may be worthwhile to re-check the wheel balancing. You may have lost a weight or two, or tire wear could be the source of an imbalance. When did the "slipping" problem start?

If suspension science is a minor mystery right now, just have a bike speed shop (usually not a dealership) check and maybe adjust your suspension settings. You may need an upgrade on the suspension system, but I'd leave that call to the experts (and maybe more than one) before spending money. At 51k miles, your rear shock may need help. Age or dirt, as well as miles, can degrade a shock. Some FJRs have a plate to protect the rear shock from road grime, which you may be able to retro-fit there.

Beyond that, bearing or bushings in the relay arm or swing arm maybe at fault, but that's not very likely, for that mileage.

Keep us posted.
.
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post #6 of 26 (permalink) Old 10-14-2020, 12:13 PM
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I'm thinking, at that low a tire pressure, that your tire is doing a sideways roll or deformation under load. The tire may not be stiff enough at low pressure. This, only if you experience a very short quick throw to the side. Not slipping, but bike moving sideways due to tire deformation. If you're slipping several inches, then that's a different story.
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post #7 of 26 (permalink) Old 10-14-2020, 12:16 PM
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Low tire pressure increases the contact patch size which increases traction IN THE DRY.
In wet conditions the larger tire contact actually decreases traction because the lbs/per inch is less allowing the tire to float on the water instead of pushing through it to the road surface.

That in addition to the squirmy feeling from lower pressure and you could easily be unnerved by it.
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post #8 of 26 (permalink) Old 10-14-2020, 02:01 PM Thread Starter
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Quote:
Originally Posted by dravnx View Post
Ask about tires but don't want a tire thread?
Guess you haven't been on this new thing they call forums.
Lower tire pressure will increase your contact patch which will increase your grip.
Perhaps your body form is off. Transfer more of your weight inside the corner to keep the bike a bit more upright. Perhaps your powering out of the corner a bit too soon or too hard.
Maybe your rebound is set too slow.
Compression too hard?
Could be that I’m powering out of the corner too soon and to hard but didn’t feel any of this on the hoon ride. The riding was more aggressive then what I do locally. My riding position is the same leaning both ways and this only happens on the a left hand turn.
Thanks.

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post #9 of 26 (permalink) Old 10-14-2020, 02:03 PM Thread Starter
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Quote:
Originally Posted by skippy344! View Post
Very nice "chicken Strip!"

Yeah, being that low, on these lo-pro radials, may give you the feel of a little scooch. But rest assured, unless there was foreign material on the surface, like oil, antifreeze, or sand, it was probably just the lower pressure giving a bigger patch print, on the surface, involving both tire compounds, at the same time, giving you that sensation.

But, I could be wrong! LOL
Nothing foreign on the tires or the road surface from what I could tell. It happened in a few different locations. I’ll be increasing the pressure for sure.
Thanks
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post #10 of 26 (permalink) Old 10-14-2020, 02:05 PM Thread Starter
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Quote:
Originally Posted by John d View Post
I'm thinking, at that low a tire pressure, that your tire is doing a sideways roll or deformation under load. The tire may not be stiff enough at low pressure. This, only if you experience a very short quick throw to the side. Not slipping, but bike moving sideways due to tire deformation. If you're slipping several inches, then that's a different story.
It feels like slipping but that doesn’t mean it’s not something else due to the low psi. I’ll be increase as said, ASAP.
Thanks
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