Tire issue ? or Not ? Question
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- easyrider
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Tire issue ? or Not ? Question
Recently installed a Michelin City Grip on the front of my PCX. Grips nicely and is great on the curves and turns, but I notice that when I make an abrupt stop the front wavers a bit side to side or has a wobble effect. The wheel is straight, rotor is fine and the disc brakes are all excellent. Fork bearings are fine.Only happens when you make an abrupt stop and when turning at the same time . Fine on a slow stop. Just wondering if anyone has experienced this effect? Thx for comments.
Re: Tire issue ? or Not ? Question
Do you mean like a shudder or vibration, or the scoot weaves left and right slightly like it's starting to do a tank slapper?easyrider wrote:...I notice that when I make an abrupt stop the front wavers a bit side to side or has a wobble effect.
If it's a shudder or vibration, on bicycles that typically means something is loose from the rotor up to the head somewhere.
Otherwise, I got no idea. Maybe a defect tyre, or out of round/balance? Does it have any obvious signs of cupping?
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Re: Tire issue ? or Not ? Question
"scoot weaves left and right slightly like it's starting to do a tank slapper".. Yep..That's it!
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Re: Tire issue ? or Not ? Question
I've got city grips and haven't noticed anything like that.
I'm presuming the direction of rotation is correct. The arrow on the side of the tyre should point in the direction of rotation.
Is the pressure ok? It might handle funny if the tyre is soft.
I'm presuming the direction of rotation is correct. The arrow on the side of the tyre should point in the direction of rotation.
Is the pressure ok? It might handle funny if the tyre is soft.
Re: Tire issue ? or Not ? Question
That's pretty dangerous mang. I'd get that tyre checked over quick smart, and not by the same place that fitted it.easyrider wrote:"scoot weaves left and right slightly like it's starting to do a tank slapper".. Yep..That's it!
Just out of curiosity: Does the red dot on the sidewall line up with the valve?
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Re: Tire issue ? or Not ? Question
I dunno. . .I don't own a PCX yet. . .I'm on cue with the rest of the wannabe owners. . .but is your combined braking system working OK? Any air in the line?"scoot weaves left and right slightly like it's starting to do a tank slapper".. Yep..That's it!
Steering head bearing tight enough? You claim it is?
And you only put a City Grip on the front wheel right? Is the back wheel still an older tire that is a different brand/type?
Radial tires grip like. . .well they grip. . .until they let go.
Bias tires will grip. . .slide. . .and then let go.
Seems like you're chopping away at the problem but not getting any chips.
- easyrider
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Re: Tire issue ? or Not ? Question
No red dot on this one.. pressure Ok, Ill check air in the brakes, and direction is correct based on the arrow although the grooving appears opposite as to what the Dunlop shows. I would like to see a pic of another front city grip on a bike and check it.It is baffling. It feels like water sloshing in a tank back and forth when I stop abruptly. May go back to the original tire for test purposes.. I have another spare wheel.
Re: Tire issue ? or Not ? Question
Yep, front City Grips have a backwards tread pattern from what is conventional.
Be warned, they are not exactly the same as the rear tyre tread pattern reversed.
Be warned, they are not exactly the same as the rear tyre tread pattern reversed.
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Re: Tire issue ? or Not ? Question
That had me rather confused when I first picked up my PCX, to the extent I went back to the dealer. Luckily he had previous customers with the same query so I didn't feel a complete idiot!chicaboo wrote:Yep, front City Grips have a backwards tread pattern from what is conventional.
Be warned, they are not exactly the same as the rear tyre tread pattern reversed.
Living the Honda Dream!
- kramnala58
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Re: Tire issue ? or Not ? Question
Here a couple ...easyrider wrote:...... I would like to see a pic of another front city grip on a bike and check it...........
2010 Honda PCX 125 in Thailand (White) - "White Lightning" Sold in Sept 2017
2009 Yamaha Majesty YP400 in USA (Metalic Titanium) - "The Throne" Sold in June 2020
2009 Yamaha Majesty YP400 in USA (Metalic Titanium) - "The Throne" Sold in June 2020
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Re: Tire issue ? or Not ? Question
Yep, thats the way mine look too..I changed out the rim, tire, and rotor.No changes.Still has a shimmy or slight wobble when I apply the right hand brake only . Only happens when I abruptly apply the front (right ) side . When they get warm the stopping is much smoother and minimal wobble. I believe something to do with the front caliper. Next time you go out check your right side hand brake and apply it to an abrupt stop(no skid) and see if anyone has the same shimmy. Interesting ??
Re: Tire issue ? or Not ? Question
I wonder if your forks are worn or tweaked and consequently have some play or are not straight?
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Re: Tire issue ? or Not ? Question
That's a good thought. However,The axle bolt lines up perfectly with the other side when installing( through) the wheel.
Re: Tire issue ? or Not ? Question
You've checked or replaced everything else, so that only leaves the caliper or forks causing the issue.easyrider wrote:That's a good thought. However,The axle bolt lines up perfectly with the other side when installing( through) the wheel.
On a bicycle with disc brakes if anything is the slightest bit loose you get crazy headshake when braking and shimmy at high speed.
I just saw a video of a bike doing what you describe, and his problem was a warped rotor, but you changed that.
Heck, maybe the oil pressure in your forks is too low causing a vibration that induces the shimmy?
I can only think of other things that should have been isolated by replacing the whole wheel, rotor and tyre like you've done.
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Re: Tire issue ? or Not ? Question
Yep, the caliper is next. I increased my tire pressure to 32 in front to see if the dynamic changes at all.Keep chipping away. When I use the CBS left brake, it seems fine ..Its basically when I use the right front brake alone and in an abrupt stop .Its like the front wheel does not want to turn or lean in your direction during the abrupt stop. Its kind of weird and maybe I am just overly sensitive as most driving conditions do not encounter this maneuver.I did bleed the front caliper to no avail. ??
Re: Tire issue ? or Not ? Question
Maybe one of the two pistons operated by the right/front brake is siezed or sticking?
- kramnala58
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Re: Tire issue ? or Not ? Question
I was wondering about a master cylinder problem .... is that what the reservoirs are called on a motorbike?chicaboo wrote:Maybe one of the two pistons operated by the right/front brake is siezed or sticking?
2010 Honda PCX 125 in Thailand (White) - "White Lightning" Sold in Sept 2017
2009 Yamaha Majesty YP400 in USA (Metalic Titanium) - "The Throne" Sold in June 2020
2009 Yamaha Majesty YP400 in USA (Metalic Titanium) - "The Throne" Sold in June 2020
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Re: Tire issue ? or Not ? Question
Hello, Sir,
The bruise on my left palm is iron-clad proof that you are not alone.
"Only happens when you make an abrupt stop and when turning at the same time "
this is similar to what happened to me, except I don't apply abruptly, just gently. I think it is the "turning at the same time" part which did the damage.
The bruise on my left palm is iron-clad proof that you are not alone.
"Only happens when you make an abrupt stop and when turning at the same time "
this is similar to what happened to me, except I don't apply abruptly, just gently. I think it is the "turning at the same time" part which did the damage.
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Re: Tire issue ? or Not ? Question
I would recommend any one riding a PCX to watch out on uneven road surface, be very careful, keep straight up.
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Re: Tire issue ? or Not ? Question
So, I have reason to believe it is not the tire, as my pcx is new with Dunlop.