Bad Tire? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Wheels, Suspension and Brakes
Everything to do with wheels, tires,
suspension, forks and brakes

 1Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 13 (permalink) Old 06-25-2019, 08:20 AM Thread Starter
Senior Member
 
Jason Pittenger's Avatar
 
Join Date: Apr 2018
Location: Northern Illinois (Not Chicago)
Posts: 251
iTrader: (0)
 
Garage
Bad Tire?

Anyone ever seen this? It's missing chunks all around my front tire. They only have a little over 2k miles on them, and I bought them in January. They are Shinko 777 tires.
Attached Thumbnails
Click image for larger version

Name:	0625190658_1561464986141.jpg
Views:	31
Size:	98.8 KB
ID:	46147   Click image for larger version

Name:	0625190659_1561465059860.jpg
Views:	33
Size:	96.9 KB
ID:	46149  


'89 Vulcan 750 Bought 4/12/18 @ 17805.9 miles $800
Purchased stock. Wrecked once
26980.4+ miles

Completed modifications:
Removed mufflers, straight pipes out of GB
110/90 Front Tire
Pick-up coil re-gapped to .020"
Compufire 55402 r/r series regulator
USB Outlet + Voltmeter
Repainted Metallic Blue w/ new tank bages
Ear Shave (wo/ coasters) 40/140 NO shims 45MPG
MCCT conversion

Planned modifications:
Custom LED turn signals
Windshield
Highway Pegs
(Possible) ignition advance
Jason Pittenger is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old 06-25-2019, 11:10 AM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 6,631
iTrader: (5)
   
Yep, bad tire. Happens to best of them at some point. Actually the first Shinko I've seen with a problem. Need to replace that, I wouldn't ride on it. It's giving you a warning.
roadpouring likes this.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf

Last edited by Spockster; 06-25-2019 at 11:15 AM.
Spockster is offline  
post #3 of 13 (permalink) Old 06-25-2019, 02:09 PM
Senior Member
 
Join Date: Aug 2016
Location: Claremont, MN
Posts: 104
iTrader: (0)
 
I have a brand new Shinko 777 front tire for sale. $60 shipped to your door...

https://www.vn750.com/forum/17-sell-...cessories.html

1993 Vulcan 750 "T'Pol"

Cobra Full Exhaust (Single Sided)
M/F AGM Battery
NGK Iridium Plugs
Shinko 777 Tires
Sunpie 7" LED Projector Headlight / KZ750-B 76-79 Bucket & Trim
Full LED Bulb Conversion
Mustang Wide Regal Seat
Aftermarket Grips & Mirror's
Full Chrome Tach / Speedometer
Mobil 1 75-90 Synthetic Gear Oil
Rotella T6 / Bosch 3323 Filter
Iceshot is offline  
 
post #4 of 13 (permalink) Old 06-25-2019, 06:12 PM
Senior Member
 
ubertalldude's Avatar
 
Join Date: Jun 2016
Location: NE Florida
Posts: 664
iTrader: (0)
 
Iceshot, that's a solid deal, but I think this should be covered under some kinda warranty. Guess it'll depend on where you bought the tire from

Earshave+Rejet (38/135) NGK Iridiums MCCT Conversion Slipstreamer S03 Windshield Custom Extended Backrest Custom Highway Bars MOSFET R/R LED Underglow Volt+USB In-Dash Two-Wire & Blue-Wire Mod Satin Black Engine Paint Dampers Parts - Jets: Main=99101-393(#132 stock)/Pilot=n424-22 Pilot(#38 stock)
ubertalldude is online now  
post #5 of 13 (permalink) Old 06-25-2019, 09:28 PM Thread Starter
Senior Member
 
Jason Pittenger's Avatar
 
Join Date: Apr 2018
Location: Northern Illinois (Not Chicago)
Posts: 251
iTrader: (0)
 
Garage
Quote:
Originally Posted by Iceshot View Post
I have a brand new Shinko 777 front tire for sale. $60 shipped to your door...

https://www.vn750.com/forum/17-sell-...cessories.html
Thank you, but I'm going to pursue a warranty on this. I should have another tire shipped to my door for free


'89 Vulcan 750 Bought 4/12/18 @ 17805.9 miles $800
Purchased stock. Wrecked once
26980.4+ miles

Completed modifications:
Removed mufflers, straight pipes out of GB
110/90 Front Tire
Pick-up coil re-gapped to .020"
Compufire 55402 r/r series regulator
USB Outlet + Voltmeter
Repainted Metallic Blue w/ new tank bages
Ear Shave (wo/ coasters) 40/140 NO shims 45MPG
MCCT conversion

Planned modifications:
Custom LED turn signals
Windshield
Highway Pegs
(Possible) ignition advance
Jason Pittenger is offline  
post #6 of 13 (permalink) Old 06-26-2019, 07:02 AM Thread Starter
Senior Member
 
Jason Pittenger's Avatar
 
Join Date: Apr 2018
Location: Northern Illinois (Not Chicago)
Posts: 251
iTrader: (0)
 
Garage
Should I go with a different brand of tire? Outside of this event, I have been happy with how this tire feels.

Is there anything I might have done to cause this? I noticed that this happened right after my 400-mile trip. In that trip, was a sustained run of about 30 minutes above 90 mile an hour, with spurts to 110. Prior to this trip, I had gone out for a joyride, and ended up on a gravel road doing about 25. The tire speed rating is at least 130.

My coworker said that this brand is terrible and should be avoided, so I don't want to replace it with another one that will do the same thing or fail catastrophically!

What would you do if you were me? Would you take a free replacement, or a refund and buy different brand? Do I need to worry about my rear tire?

And of course, the weather is going to be nice next several days while I get this sorted out...


'89 Vulcan 750 Bought 4/12/18 @ 17805.9 miles $800
Purchased stock. Wrecked once
26980.4+ miles

Completed modifications:
Removed mufflers, straight pipes out of GB
110/90 Front Tire
Pick-up coil re-gapped to .020"
Compufire 55402 r/r series regulator
USB Outlet + Voltmeter
Repainted Metallic Blue w/ new tank bages
Ear Shave (wo/ coasters) 40/140 NO shims 45MPG
MCCT conversion

Planned modifications:
Custom LED turn signals
Windshield
Highway Pegs
(Possible) ignition advance
Jason Pittenger is offline  
post #7 of 13 (permalink) Old 06-26-2019, 07:08 AM
Senior Member
 
ubertalldude's Avatar
 
Join Date: Jun 2016
Location: NE Florida
Posts: 664
iTrader: (0)
 
It's all anecdotal, but I have had Shinko's on mine for a couple years, no issues. Tread depth is good with about 7000+ miles on them. The rear even has a plug in it (not recommended by the manufacturer or anyone else, but I check that it's holding air before every ride, and it's holding.)

Hopefully it's a QA issue, 110 shouldn't hurt a tire. I wonder what the production date code says? Maybe it was sitting on a shelf for too long and has dryrotted some? Definitely worth hashing out with Shinko/whoever you bought the tire thru.

Earshave+Rejet (38/135) NGK Iridiums MCCT Conversion Slipstreamer S03 Windshield Custom Extended Backrest Custom Highway Bars MOSFET R/R LED Underglow Volt+USB In-Dash Two-Wire & Blue-Wire Mod Satin Black Engine Paint Dampers Parts - Jets: Main=99101-393(#132 stock)/Pilot=n424-22 Pilot(#38 stock)
ubertalldude is online now  
post #8 of 13 (permalink) Old 06-26-2019, 08:39 AM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 6,631
iTrader: (5)
   
Has the tire always held air, or have you found it to be quite a bit low at different times?


Found this at Napa:
3 Tire Damage Warning Signs That It's Time to Replace Your RubberNAPA Know How Blog

I've seen this most often on large truck tires, those trucks never see autocross as mentioned below. Bad shocks? I don't think many companies replace shocks on their trucks But searching the term 'tire chunking' shows it happens somewhat often, even to the top brands.

Quote:
1. Chunking

Chunking is the term used to describe missing sections of tread from a tire. It almost looks as though the tread has been sliced or torn off in chunks from seemingly random areas.

Tire damage like this typically occurs for one of two reasons. The first is related to suspension problems, such as a bad shock absorber making it impossible for the tire to maintain constant contact with the road. As it bounces up and down on the pavement, the force of the impact can cause tread chunking. A second common cause of chunking is related to heat — specifically, not warming up a tire before subjecting it to severe stress on an autocross or road course.

Chunked tires are not immediately dangerous, but their lifespan has been significantly shortened. The more tread that’s missing, the less grip they’ll have on the asphalt, which in turn can lead to unpredictable behavior under braking, in inclement weather or when cornering.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf

Last edited by Spockster; 06-26-2019 at 08:42 AM.
Spockster is offline  
post #9 of 13 (permalink) Old 06-26-2019, 03:29 PM Thread Starter
Senior Member
 
Jason Pittenger's Avatar
 
Join Date: Apr 2018
Location: Northern Illinois (Not Chicago)
Posts: 251
iTrader: (0)
 
Garage
The date code is 2618, so about June-July 2018.

Quote:
Originally Posted by Spockster View Post
Has the tire always held air, or have you found it to be quite a bit low at different times?


Found this at Napa:
3 Tire Damage Warning Signs That It's Time to Replace Your RubberNAPA Know How Blog

I've seen this most often on large truck tires, those trucks never see autocross as mentioned below. Bad shocks? I don't think many companies replace shocks on their trucks But searching the term 'tire chunking' shows it happens somewhat often, even to the top brands.
The tire was down two PSI from when I had it mounted in April, so it holds air well.

From the Napa article:
"making it impossible for the tire to maintain constant contact with the road. As it bounces up and down on the pavement, the force of the impact can cause tread chunking."

This made me pause. During parts of my return trip, I wanted to stretch my legs, so I slide up to the passenger seat and used the passenger pegs while riding. I kept my hands on the bars of course. This reduced the weight on the front tire, though it didn't change the stability feel of the bike. I didn't do this during corners, only straights, and when I knew I'd be at a steady speed. I never had to brake while riding like this.

Could the reduced weight on the front have caused the tire to momentarily lose contact and cause the chunking? It certainly never felt like it lost contact. I would think I would feel it lose contact.


'89 Vulcan 750 Bought 4/12/18 @ 17805.9 miles $800
Purchased stock. Wrecked once
26980.4+ miles

Completed modifications:
Removed mufflers, straight pipes out of GB
110/90 Front Tire
Pick-up coil re-gapped to .020"
Compufire 55402 r/r series regulator
USB Outlet + Voltmeter
Repainted Metallic Blue w/ new tank bages
Ear Shave (wo/ coasters) 40/140 NO shims 45MPG
MCCT conversion

Planned modifications:
Custom LED turn signals
Windshield
Highway Pegs
(Possible) ignition advance
Jason Pittenger is offline  
post #10 of 13 (permalink) Old 06-26-2019, 03:52 PM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 6,631
iTrader: (5)
   
I don't think sitting on the back caused this. I've done that, and it does feel strange in the turns. Edit: Well maybe. Did the front shake any that you noticed?

Any irregular road surfaces around you? Like bridges with an open grid deck (see through), railroad tracks, unusual pavement, or cut pavement (traction cuts)? Hitting rumble strips can eat up tires pretty much like yours, doesn't take much for a semi to ruin a tire on them.

Are those spots all around the tire like that in a line? Those in the pic seem to line right up with the mold seams.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf

Last edited by Spockster; 06-26-2019 at 03:56 PM.
Spockster is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Once registered, your User Name"cannot be changed". We can make exceptions within 7 days, but after that, it is set in stone.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome