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Display Mesage #117812


Re: Drop in Dunlop K555 mileage
Written by David on 11/4/2015 at 08:43 pm

I asked my son where he got the information about tire chemicals being banned. It turns out it was not ADV, but rather a friend who is a engineer that works for a company that makes water jet cutting equipment. Apparently he was working on a project with an engineer that works for a tire company. I'll try to talk to his friend and see if I can get more specific information. I would suspect that it was an antioxidant, although it may have been a solvent that is used to keep the rubber soft. Racers use stuff like toluene to soften the tread of their tires, but the effect is temperary because the toluene evaporates. There may be something similar that has been used in new tires that is less volitile.

Another posibility for our observed change in tread wear is a change in the filler used in the rubber. Traditionally tread rubber has been about 50% carbon black. More recently tire companies have been replacing some of the carbon with silica, to reduce rolling resistance, in a effort to reduce fuel consumption. Don't know if this change has occurred with motorcycle tires, but one of the problems with some of the tires using silica has been reduced traction and tire life. Recently, advances in silica chemistry have reportedly allowed silica loaded tires to actually have improved traction and longer tread life, so our tires could be anywhere in this chain of development.

Leland suggested that a change in the country of manufacture might be responsible for poor wear and Metzler rear tire chunking. I was correct that the rear I mounted the other day was made in Germany, but my front, purchased at the same time about 2 years ago was made in Brazil. I'm assuming the the Metzlers that chunked were more than 2 years old and so were probably made in Germany. I have yet to put the rear Metzler on my bike as I bought an extra wheel and have been riding on a BFG car tire, but so far the Brazilian tire has been wonderful.

Message Thread for message #117812

Leland Sheppard
10/31/2012, 12:00 am
Drop in Dunlop K555 mileage
Hi Coasters,I think my mechanic figured out why more than one of us has experienced a large drop in mileage on Dunlop K555s: They are no longer made inJapan.My current set of tires says 'Made in Indonesia'. The set on

    Mark Miller
    10/31/2012, 12:00 am
    Re: PC800: Drop in Dunlop K555 mileage
    My last set went to about 7000 miles.  I think the ones on it now will probably do about the same.  I had heard they were capable of 10,000.

    Leland Sheppard
    10/31/2012, 12:00 am
    Re: Drop in Dunlop K555 mileage
    Hi Mark,

    David
    10/31/2012, 12:00 am
    Re: Drop in Dunlop K555 mileage
    I wonder if the person you talked to really knew what he was talking about. If the compound is the same it certainly doesn't make any difference where it is made. My son tells me there has been a lot of discussion about this on ADV rider and the

    revconprince
    11/1/2015, 10:14 am
    Re: Drop in Dunlop K555 mileage
    There is likely more to the story. What I have found is when manufacturing is moved to a less industrial country, the quality control on the raw material is much worse. The refinement and processing the raw material is not as pure. Even though it may

    Mark Miller
    11/3/2015, 10:52 am
    Re: PC800: Re: Drop in Dunlop K555 mileage
    Mine say "MADE IN JAPAN"If it helps, the number in the replaceable slot is NA2M401.  I assume that would tell somebody when exactly they were made.  I couldn't find a date of any kind.I let the shop dispose of the old

    Leland Sheppard
    11/4/2015, 10:55 am
    Re: Drop in Dunlop K555 mileage
    Hi Mark,

    Mark Miller
    11/4/2015, 06:27 pm
    Re: PC800: Re: Drop in Dunlop K555 mileage
    Most welcome.  I just wish I had checked the old tires first.  The final mileage on these may yet surprise me.

    David
    11/4/2015, 08:43 pm
    Re: Drop in Dunlop K555 mileage
    I asked my son where he got the information about tire chemicals being banned. It turns out it was not ADV, but rather a friend who is a engineer that works for a company that makes water jet cutting equipment. Apparently he was working on a project

    revconprince
    11/5/2015, 04:47 am
    Re: Drop in Dunlop K555 mileage
    Europe has more environmental restrictions than Brazil, so that may be something you are running into. I know European brake pads have a much worse problem with brake dust than American ones due to environmental restricions. Could have been the same

    Gib
    11/5/2015, 05:27 am
    Re: Drop in Dunlop K555 mileage
    I replaced my two year old 12,000 mile front Dunlop a couple of months ago. It was made in Japan and still had good rubber left on it. I think it was also the first time that a front tire wasn't scalloped... for me any way.

    wynndungey
    11/5/2015, 05:53 am
    Re: Drop in Dunlop K555 mileage
    When my Metzler chunked, I did some research and found that a batch of Brazilian Metzlers had been recalled. I'm hoping all that is past. I did report the tire to Metzler. (It's been a few years.)