Shinko 705 Tire question - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 19 Old 05-01-2014, 03:57 PM Thread Starter
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Shinko 705 Tire question

Ok long time lurker motorcycle tire newbie questions.

I have owned my strom for 2 years. I put about a total of about 4k miles on the bike . The shinko 705s on the bike were relatively new when I got the bike.

The date on the rubber is 4511 so they are not forever old.

On the rear tire I am starting to see a little bit dry rot on the inner sides of the tread blocks. I have found a couple of 1 cm cuts inside the tread blocks too.

The rot is not on the entire tire just in that area.


https://drive.google.com/file/d/0B9D...it?usp=sharing




you can see the some of the rot on the base of that tread block.



This pic is the smaller cut



https://drive.google.com/file/d/0B9D...it?usp=sharing

you can see the some of the rot on the base of that tread block.

I know I am going to replace it but I wondered if I can get the rest of the season on this one.

SO my question is can I expect shinko tires to rot after 4 years?
I have only 4 k on these tires and no idea how many the previous owner put on.

was/is there something I can do to prevent this?

I know that most of this is conditional and or opinions. I want your opinions I know very little about motorcycle tires.

Thanks in advance.
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post #2 of 19 Old 05-01-2014, 04:41 PM
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You have the infamous Shinko delamination!

I don't think I would be riding on that tire, replace it asap. The cut you refer to looks like the rubber pulling apart as the loose components flex.

This is a known issue with them, the older tire ( bias ply ) had many cases of this and the newer radial version still had some issues reported. Yours may still be the bias ply.

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Last edited by realshelby; 05-01-2014 at 04:57 PM.
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post #3 of 19 Old 05-01-2014, 05:29 PM
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I would get a new set of tires, that definitely looks like defective tires. Probably not cuts at all, but rather bulges that are cracking open and starting to delaminate from the belts.

Probably an old set when Shinko was having rubber issues. Contact them, probably worth a try getting them replaced. I like 705's but the quality control has me worried slightly, haven't had a failure personally. But, the bad batch soured lots of people on them. I ran them on my smaller bikes, but the Strom gets Tourances for now. Haven't read about any major issues with the original Tourances
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post #4 of 19 Old 05-01-2014, 05:38 PM
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Quote:
Originally Posted by Sagebrush View Post
I would get a new set of tires, that definitely looks like defective tires. Probably not cuts at all, but rather bulges that are cracking open and starting to delaminate from the belts.

Probably an old set when Shinko was having rubber issues. Contact them, probably worth a try getting them replaced. I like 705's but the quality control has me worried slightly, haven't had a failure personally. But, the bad batch soured lots of people on them. I ran them on my smaller bikes, but the Strom gets Tourances for now. Haven't read about any major issues with the original Tourances
Tourances have had issues too, they had allot of bad front tires. The Shinkos are up to par with any other major tire company out there, matter of fact I run them on both of my bikes. The bias ply 705 has had issues in the past, not really aware of any with the radials.

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post #5 of 19 Old 05-01-2014, 06:04 PM
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Eight months ago, Shinko warranteed my front bias ply 705 that were on my bike when I got it. They replaced it with a radial. I emailed Shinko directly. Can't hurt to ask.


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post #6 of 19 Old 05-01-2014, 11:12 PM
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I put on a 705 a few months back and it will probably be toast at 6K miles. It's worked really well for me for the price. I'll be getting more 705's in the future. I think the radials are a better build.
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post #7 of 19 Old 05-02-2014, 05:47 AM
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The "larger" and "smaller" cut looks like rock/nail puncture type damage. I would consider that "normal" in an off road tire.

The fine cracking you see is due to heat cycling of the rubber, age and the hard compound.

I've seen that same fine cracking pattern around tread blocks from damn near every tire company when the tires get old, or if they are a very hard compound (or both). Hell the Bridgestone 023 on the front of my DL650 when I bought it looked like that (but it was made in back in 09) when I bought it. I replaced it as soon as I got home.

Rubber's life is determined by it's makeup(hard/soft compound), environment (including how it's used) and it's age. How you USE the tire affects the tire life/cracking (under/over inflation and/or overloading the tire for the inflation pressure).

The harder compound in the 705's that gives them long life, also leads them to be prone to cracking. You almost never see those kind of cracks in a very soft "track" compound tire. Only in "hard" or "high mileage" compound tires.

Yes, I would get them replaced. Sure, I would contact Shinko, it can't hurt. But I don't see anything there that screams "manufacturing defect" or "delamination". My guess is Shinko will blame it on overheating the tire due to improper inflation.loading. I'm not saying that's what this is, I'm just playing the devil's advocate here.
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post #8 of 19 Old 05-02-2014, 09:00 AM
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Replace. As some have said this is probably due to older tire and hard rubber compound that starts to crack. I plan on trying the Full Bore tire next. A friend runs them on his Tiger and loves them. Its a 705 made with a different rubber compound at Shinko plant for Full Bore. About the same price....

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post #9 of 19 Old 05-02-2014, 10:01 AM
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Quote:
Originally Posted by Random00 View Post
The "larger" and "smaller" cut looks like rock/nail puncture type damage. I would consider that "normal" in an off road tire.

The fine cracking you see is due to heat cycling of the rubber, age and the hard compound.

The harder compound in the 705's that gives them long life, also leads them to be prone to cracking.

They do look like puncture damage at first. But, if you had seen all the pictures posted about this tire and the start of the delamination you might agree that this is the exact same thing. The crack along the tread block and the "tear" is typical of a tire delamination.

Fine cracking is normal on older tires and I agree it is not a problem. But that type of cracking is consistent around the tire.

The Shinko 705 is actually a rather soft compound tire. Part of why it works so well on pavement and in the wet.....and doesn't get high mileage.

'12 DL 650 '14 BMW R 1200 RT

WERKS modified clutch baskets for DL and SV 1000's.
The BEST in chudder control, noise control, and lasting durability! AVAILABLE HERE: www.werksparts.com

Have questions about the clutch in your DL or SV 1000? E-mail Terry [email protected]
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post #10 of 19 Old 05-02-2014, 10:22 AM
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Let's get real here...

A new rear 705 is a lousy $86.

Replace it. It's not worth riding in fear or taking any chances for that amount of money.

It's hard to tell from your photos exactly what's going on (need pics from the side to see if there's the bulging of delamination), but that cut, wherever it came from, means the tire is DONE. Replace it PDQ and ASAP.


I had a set of the old bias-ply 705s that delaminated, and the retailer (Motorcycle Superstore) worked with Shinko to refund the purchase price. The radials are great tires, and I've used a few sets on my DL1000 and the bias-ply versions on my KLR650.

In your case, you're not the original purchaser, so the situation becomes a little more murky. Shinko might do something for you, or they might tell you to talk to the retailer first (and you probably have no idea who that was anyway). In any case, do NOT wait on Shinko or anyone else -- the important thing is to fix the safety issue. You can argue about the money later.

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Last edited by bwringer; 05-02-2014 at 10:28 AM.
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