City Grip tire: repair possible?
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Member
2019 Vespa GTS300 Super; 2004 Vespa GT200
Joined: 15 Sep 2018
Posts: 43
Location: Herriman, UT
Mon Jul 08, 2019 8:33 pm quote
Looks like I got a metal sliver / shard in the tread on my rear Michelin City Grip tire. They have less than 800 miles. Is it possible to repair? If so, can a regular tire shop do it? How much might it cost?

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Granturismo 218
Joined: 04 Feb 2013
Posts: 5532
Location: South Carolina
Mon Jul 08, 2019 8:49 pm quote
It is possible, and there are a lot of people on this forum who would repair it if it was on their own bike.
Most bike shops in the US won't repair it, because if the plug or patch fails, and something happens because of that, your attorney will get 40% of whatever they own.
Hooked
2013 GTS300ie
Joined: 12 Dec 2017
Posts: 434
Location: Pretoria, South Africa
Mon Jul 08, 2019 10:11 pm quote
It is easily repaired using a mushroom plug.



You need to remove the tire from the rim.
The metal shard is removed and the area inside around the hole is roughened using a rotary file to improve the grip of the plug. Adhesive is applied to the inside surface and the plug is inserted from inside the tire, pulled through and the patch pressed down with a roller. The stem of the patch protrudes through the tire and is trimmed off flush with the tread after re-fitting to the rim. The wheel needs to be re-balanced after repair.

This is a permanent repair.
The sticky rubber worms are only temporary repairs.
Veni, Vidi, Posti
MP3 500, GTS 250 (both 2008 MY), 2012 Honda NC700 DCT
Joined: 02 Mar 2013
Posts: 5432
Location: Madison, Wisconsin
Tue Jul 09, 2019 1:59 am quote
Fudmucker wrote:
The sticky rubber worms are only temporary repairs.
I use sticky rubber worms to repair holes just like that one.
The tire itself is just a temporary replacement of the last one, and will only last until the next one.
Veni, Vidi, Posti
2008 MP3 500, 2013 BV350
Joined: 13 Oct 2012
Posts: 7402
Location: Ashburn, Va. Home to the Internet
Tue Jul 09, 2019 2:09 am quote
Fudmucker wrote:
It is easily repaired using a mushroom plug.



You need to remove the tire from the rim.
The metal shard is removed and the area inside around the hole is roughened using a rotary file to improve the grip of the plug. Adhesive is applied to the inside surface and the plug is inserted from inside the tire, pulled through and the patch pressed down with a roller. The stem of the patch protrudes through the tire and is trimmed off flush with the tread after re-fitting to the rim. The wheel needs to be re-balanced after repair.

This is a permanent repair.
The sticky rubber worms are only temporary repairs.
These are the thing to use if you are patching a motorcycle tire.

Sticky plugs suck, they leak over time and can blow out. BTDTHTB, thank god not on a motorcycle.
Addicted
2007 GT200, 2008 Yamaha C3
Joined: 27 Jul 2012
Posts: 536
Location: Denver
Tue Jul 09, 2019 5:51 am quote
I confirm the vote for the patch / plug combination. I went for a couple of years where I never wore out a rear tire. I kept picking up deck screws in them. I was left stranded with a stick plug that failed after 45 miles. I now pull the tire from the rim and patch it from the inside. I use a wire brush on a drill to clean the inside of the tire before patching.
Moderatus Rana
MP3 250 (sold) MP3 500 (current)
Joined: 11 Jul 2008
Posts: 21456
Location: Palatka, Florida
Tue Jul 09, 2019 6:24 am quote
That puncture is in a thin part of the tire so a mushroom plug would be optimal. However I have used sticky rope on a similar puncture and also one in the thick part of the tread and the tires both wore out before any failure of the sticky rope could occur. Both were rear tires.
Addicted
2018 LIBERTY 150S
Joined: 26 Jul 2013
Posts: 846
Location: Ohio
Tue Jul 09, 2019 6:54 am quote
No need to remove tire.
Can't blow out.
Holding perfect air seal.

Several videos show how to use this plug kit.
https://www.youtube.com/watch?v=FtphCgcnDVs
The screw was in the center of my Michelin rear tire.


Remove screw.
Ream hole.
Insert pointy bit w/shank.
Unscrew & leave in shank.
Insert plug in gun tip. Lube lightly.
Screw gun and shank together.
Pump handle to push plug through shank and tire until no more movement.
Pull out the tool.
Pull an inch or two on plug to insure seating.
Trim it off and air it up.

"Your father's brother is your uncle!"

The Slime pump aired tire quickly. (comes with cigar lighter, battery tender, and alligator connections for every kind of voltage hook up; plus pressure gauge pen)

Took longer to read instructions than to fix the tire. See no leaks, will check again in a few hours.
7 months later - still perfect air seal.


https://www.amazon.com/Stop-Go-1075-Standard-Plugger/dp/B0018EUDHW/ref=sr_1_3?ie=UTF8&qid=1546870426&sr=8-3&keywords=stop+and+go+tire+repair+kit

O.S.












Last edited by OldSchooot on Tue Jul 09, 2019 7:02 am; edited 1 time in total
Veni, Vidi, Posti
2008 MP3 500, 2013 BV350
Joined: 13 Oct 2012
Posts: 7402
Location: Ashburn, Va. Home to the Internet
Tue Jul 09, 2019 7:01 am quote
Any plug CAN leak. Once you put a plug in you need to double up on your tire pressure checks.
Those are good plugs but again, any plug can leak or come out.
Hit a rock just right and it could push the plug into the tire.
Ossessionato
GT200 & GTS250 & NC750X & Royal Enfield Pegasus
Joined: 23 Aug 2013
Posts: 2126
Location: London
Tue Jul 09, 2019 8:20 am quote
Fudmucker wrote:
The sticky rubber worms are only temporary repairs.
They seem to last quite well for me, I currently have about 4 of these in the rear tyre of my NC750, and they last as long as the tyre. The great thing about these repair kits is they're small and fairly cheap. The mushroom plug ones are probably better but you need more equipment to make the fix. My Enfield has tubed tyres and these are a complete PITA to fix when they get a puncture.

Has the OP checked that the metal has punctured the tyre? is air actually escaping?
Member
2019 Vespa GTS300 Super; 2004 Vespa GT200
Joined: 15 Sep 2018
Posts: 43
Location: Herriman, UT
Tue Jul 09, 2019 8:28 am quote
[quote="robinm"]
Fudmucker wrote:
Has the OP checked that the metal has punctured the tyre? is air actually escaping?
Yes. Air leaks, although not terribly fast. Definitely a puncture.

Thank you all for feedback so far! This community is very helpful.
Veni, Vidi, Posti
MP3 500, GTS 250 (both 2008 MY), 2012 Honda NC700 DCT
Joined: 02 Mar 2013
Posts: 5432
Location: Madison, Wisconsin
Tue Jul 09, 2019 8:29 am quote
WEB-Tech wrote:
Hit a rock just right and it could push the plug into the tire.
Hit a nail just right and it could push itself right into the tire.

For that matter, a rock can also put a hole in a tire all by itself, no pilot hole required.
Molto Verboso
Yamaha Tricity 155 Urban 2019 - MV Agusta 125 RS 1956 - Moto Guzzi Airone 250 Sport 1951
Joined: 21 Jul 2007
Posts: 1503
Location: Latina (Italy)
Tue Jul 09, 2019 8:32 am quote
[quote="spencerkellis"]
robinm wrote:
Fudmucker wrote:
Has the OP checked that the metal has punctured the tyre? is air actually escaping?
Yes. Air leaks, although not terribly fast. Definitely a puncture.

Thank you all for feedback so far! This community is very helpful.
... it's also useful, really ...
Veni, Vidi, Posti
2008 MP3 500, 2013 BV350
Joined: 13 Oct 2012
Posts: 7402
Location: Ashburn, Va. Home to the Internet
Tue Jul 09, 2019 9:34 am quote
Madison Sully wrote:
WEB-Tech wrote:
Hit a rock just right and it could push the plug into the tire.
Hit a nail just right and it could push itself right into the tire.

For that matter, a rock can also put a hole in a tire all by itself, no pilot hole required.
This happen often on the ATV. Would be cruising down the trail and all of a sudden tire goes flat and it turned out to be a pre existing hole. When dismounting the tire I would find a plug in the tire.

From ATVing I have installed more plugs then most people that fix tires for a living.
Member
2019 Vespa GTS300 Super; 2004 Vespa GT200
Joined: 15 Sep 2018
Posts: 43
Location: Herriman, UT
Tue Jul 09, 2019 11:37 am quote
Well, I went the cheap/$5 route to hold until I can just replace the rear tire altogether. I don't know how well or long these string plugs will hold. But I rarely go all that far from home, so I think it should be ok. The process was easy; almost too easy. *cue ominous music*

Fun fact: My bicycle pump seems to inflate the tires nicely on the GTS 300; it took about 150-160 pumps to get to 32 psi.

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Moderatus Rana
MP3 250 (sold) MP3 500 (current)
Joined: 11 Jul 2008
Posts: 21456
Location: Palatka, Florida
Tue Jul 09, 2019 11:58 am quote
Should do the trick for now. Keep an eye on the pressure.
Ossessionato
GT200 & GTS250 & NC750X & Royal Enfield Pegasus
Joined: 23 Aug 2013
Posts: 2126
Location: London
Tue Jul 09, 2019 12:28 pm quote
For that really professional touch you can snip those ends off. Wait till it's all dry though. This will stop them getting unnecessarily pulled around while riding.
Hooked
2003 ET2 (SOLD); 2004 GT200
Joined: 22 Oct 2016
Posts: 340
Location: Atlanta, GA
Tue Jul 09, 2019 12:36 pm quote
I'd suggest looking into RideOn. I had a small metal shard in one of my City Grips and putting RideOn in has held it stable for several months now.

Last edited by everytimeidom on Tue Jul 09, 2019 2:34 pm; edited 1 time in total
Hooked
BV 350
Joined: 22 Nov 2016
Posts: 400
Location: Nebraska
Tue Jul 09, 2019 12:56 pm quote
Theoretically
Theoretically, the internal patches are a little less likely to develop leaks down the road. My personal experience is only with sticky ropes, and they seem to MOSTLY patch it, but my patches always seem to have very slow leaks that need topping up once a weeek or so. If I was away from home and had a puncture, I'd use a sticky rope to get home, then remove it and do the interior patch. With more surface area, and glued to the tire, even tread squirm isn't going to create a leak, most likely
.
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Granturismo 218
Joined: 04 Feb 2013
Posts: 5532
Location: South Carolina
Tue Jul 09, 2019 1:39 pm quote
Madison Sully wrote:
The tire itself is just a temporary replacement of the last one, and will only last until the next one.
Quite the Koan, Zen Master.
Veni, Vidi, Posti
2008 MP3 500, 2013 BV350
Joined: 13 Oct 2012
Posts: 7402
Location: Ashburn, Va. Home to the Internet
Tue Jul 09, 2019 1:57 pm quote
spencerkellis wrote:
Well, I went the cheap/$5 route to hold until I can just replace the rear tire altogether. I don't know how well or long these string plugs will hold. But I rarely go all that far from home, so I think it should be ok. The process was easy; almost too easy. *cue ominous music*

Fun fact: My bicycle pump seems to inflate the tires nicely on the GTS 300; it took about 150-160 pumps to get to 32 psi.
In the tread is much better than in the bit that hits the road every rotation.
Veni, Vidi, Posti
MP3 500, GTS 250 (both 2008 MY), 2012 Honda NC700 DCT
Joined: 02 Mar 2013
Posts: 5432
Location: Madison, Wisconsin
Tue Jul 09, 2019 3:02 pm quote
Motovista wrote:
Madison Sully wrote:
The tire itself is just a temporary replacement of the last one, and will only last until the next one.
Quite the Koan, Zen Master.
Molto Verboso
Yamaha Tricity 155 Urban 2019 - MV Agusta 125 RS 1956 - Moto Guzzi Airone 250 Sport 1951
Joined: 21 Jul 2007
Posts: 1503
Location: Latina (Italy)
Tue Jul 09, 2019 8:17 pm quote
Re: Theoretically
Jimding wrote:
Theoretically, the internal patches are a little less likely to develop leaks down the road. My personal experience is only with sticky ropes, and they seem to MOSTLY patch it, but my patches always seem to have very slow leaks that need topping up once a weeek or so. If I was away from home and had a puncture, I'd use a sticky rope to get home, then remove it and do the interior patch. With more surface area, and glued to the tire, even tread squirm isn't going to create a leak, most likely
.
This is the best advice.
Veni, Vidi, Posti
2008 MP3 500, 2013 BV350
Joined: 13 Oct 2012
Posts: 7402
Location: Ashburn, Va. Home to the Internet
Wed Jul 10, 2019 4:15 am quote
Re: Theoretically
Attila wrote:
Jimding wrote:
Theoretically, the internal patches are a little less likely to develop leaks down the road. My personal experience is only with sticky ropes, and they seem to MOSTLY patch it, but my patches always seem to have very slow leaks that need topping up once a weeek or so. If I was away from home and had a puncture, I'd use a sticky rope to get home, then remove it and do the interior patch. With more surface area, and glued to the tire, even tread squirm isn't going to create a leak, most likely
.
This is the best advice.
No, it doesn't seal the outside of the tire so water can get into the ply's of the tire and cause separation.
Hooked
2016 GTV 300 ABS
Joined: 14 Feb 2010
Posts: 158
Location: Andrews, TX
Wed Jul 10, 2019 5:51 am quote
I have a sticky rope plug in my rear tire, and so far it's holding nicely. It's been about 8 months now. However, the Stop N' Go system looks like the best home remedy, so that's what I intend to purchase.

I have 1,400 miles to go before the 6,000-mile service interval, so hopefully the plug will hold until then because I intend to get new tires (whether they're totally necessary or not).

Last edited by ETres on Wed Jul 10, 2019 6:46 am; edited 1 time in total
Molto Verboso
Yamaha Tricity 155 Urban 2019 - MV Agusta 125 RS 1956 - Moto Guzzi Airone 250 Sport 1951
Joined: 21 Jul 2007
Posts: 1503
Location: Latina (Italy)
Wed Jul 10, 2019 6:16 am quote
We consider that by putting the rubber mushroom or the patch inside the tire, the wheel and the tire must be removed. If you don't drill every day this is best done by the tire dealer; finally the rubber candle is better...
Member
Joined: 03 Jan 2018
Posts: 33
Location: Ga
Wed Jul 10, 2019 6:45 pm quote
Not on my scooter but I had the same problem on my maxxis truck tires. I just used a sticky rope and had no complaints. I run them until tread wear out.
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