Landracing Forum
Tech Information => Technical Discussion => Topic started by: bharmon77 on November 19, 2011, 11:45:52 AM
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I need some help. I went to look at a belly tank lakester that was for sale and it has what we were told were Dunlop LSR tires? These tires are marked on the side wall "Dunlop Racing 7.00-18" thier is an S in a circle and 86H also on the side wall. These tires were purchased approx. 5 years ago and have a knobby tread pattern. I cannot find a speed rating or any other info on these tires, can anyone give an idea where to look or do you know these tires?
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http://www.rogerkrausracing.com/
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I have been told that 250 is about the max, I also hear that they are more popular at El Mirage...
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BH --- You better get building ... April is just around the corner and you won't have far to go get to the track.
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I am also looking for some info on the Dunlop vintage racing tires. I know there are a few cars running them on the salt and one person I spoke with mentioned having to shave them down a bit? Why would you have to do that? I would really hate to screw up a 1200$ set of tires.
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I have used both the 550x18" and the 700x18" Dunlops. The 550's were bought used and were worn. I rounded the edges and mounted them on 5" "tracter" outers 5 on 5 steel centers. Total cost $550 and the benefits after 2 runs was a red hat for my son at 202 mph.
For the next year I purchased 2 new 750's from a friend who was not going to use them. I left all the tread one them and again rounded the edges. I purchased 2 new 7" wide Wheel Vintiques forged aluminum wheels also 5 on 5. Total cost $1600. The benefits was another red hat, this time for me, at 210 mph.
For me they were what made the records and were a relative inexpensive way to do it. The good thing is I have them and I'm they won't go down in value if taken car od and I guarrentee they are.....Good Luck JD
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Jimmy six,
Funny that you have this set of tires, the tank that my friend is looking at is GMC 6 powered. Thank you for the response it sounds like these are good tires, any other way to identify them as LSR tires?
And as for 55chevr;
If it will make you feel better I will take the long way to the race track next April, see you there.
BHarmon
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They are not dedicated LSR tires, they were designed originally for vintage racing for Grand Prix and Roadster type Indy cars. The LSR guys stared racing them because at the time no one was making tall LSR tires and the Indy Firestone's that most were running on were about 40 years old. They need to be shaved like the Indy Firestone's or they will start throwing rubber at high speed. Tony
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As Tony said they are not dedicated LSR tyres but are definately used on vintage race cars. For what I used them for would probably never hurt them or cause me any trouble. Seeing them run around Montery at speed definately puts more heat into them than I ever will. The best this was to see a set on them on the 7 million dollar Auto Union that was sold recently.
Like I said I did not shave them other than making them true and rounding the edges. If you need a picture I can pull one out of my shed. I would have liked to use a 6" wide wheel but was inable to get them. With some extra $$$ I could have done them..............
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I also run the 700 series (~32" tall or 101" roll out shaved) Dunlops setting a record this year at El Mirage @213. Doug Robinson has run the 30" tire to over 250 @ El Mirage too.
Here's a couple pictures. One of mine the other of Robinson's to give you an idea how they look shaved.
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Assuming the tire isn't punctured or destroyed in some way how many runs do you think up could make on a tire like this? I am planning to use these on my lakester with a target speed of under 150mph.
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At that speed I'd say tire life would be measured in years.....
The thing to keep in mind is the rubber will deteriorate over years so follow some simple thinks people on this site do to protect their tires.
Do not leave them on the car with the vehicle weight on them.
Do not leave them in direct sun light or high heat areas.
Use nitrogen instead of air for inflation
When storing tires place in a dark trash bag with little to no air in the tire and add some nitrogen to the bag as you seal it.
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Thanks for all of the info. and the pictures, the tires in the pics are the same that I am asking about. The guy with the car for sale did mention that they needed to be shaved and we were trying to figure out why? Now I know. The car will be run in the XO and XXO lakester class where the record is over 200 mph and we didn't know if these tires would pass tech at Bonneville or not. It sounds from your response that they have in the past.
Thanks again,
BHarmon
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I better ask this question direct; have the Dunlop tires passed tech at Bonneville in the past for use in an over 200mph class?
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I better ask this question direct; have the Dunlop tires passed tech at Bonneville in the past for use in an over 200mph class?
Yes we ran them on 225 record, we never went above 200 for other reasons...
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I also run the 700 series (~32" tall or 101" roll out shaved) Dunlops setting a record this year at El Mirage @213. Doug Robinson has run the 30" tire to over 250 @ El Mirage too.
Here's a couple pictures. One of mine the other of Robinson's to give you an idea how they look shaved.
Dynoroom...do the Dunlops give you more traction than the other tires you have run?
Also...do the Dunlaps have a speed and weight rating? The #66 roadster had a time of 290 mph + at Bville and I think they were running the Dunlops.
JL222
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Doug told me that he runs the M/T tires on the salt and the Dunlop's on the dirt. But I think he also has run the Dunlop's on the salt, but not at 290. Tony
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I run the Dunlops on the dirt because they are roughly half the price ($375 vs. $735 ea.) of my M/T's. We've run over debris more on the dirt and the Dunlops seem to withstand it better. As far as traction....... what are you NUTS!?, :-D we race on dirt!
No, we've run both and my drivers can't tell the difference, 'course they only have about 3 years behind the wheel.
Tony I think your correct about Robinson's tires.
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I run the Dunlops on the dirt because they are roughly half the price ($375 vs. $735 ea.) of my M/T's. We've run over debris more on the dirt and the Dunlops seem to withstand it better. As far as traction....... what are you NUTS!?, :-D we race on dirt!
No, we've run both and my drivers can't tell the difference, 'course they only have about 3 years behind the wheel.
Tony I think your correct about Robinson's tires.
So where is the best place to find a set of Dunlop racing tires? The one place that was mentioned earlier in the tread get almost $600 a tire. 375$ would be much better...
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Unfortunately there are no deals on Dunlop tires in North America.... Have been running 6.00x16 & 6.50x16 on my vintage car since the 80's....East Coast distributor Sasco Motorsports 877-377-7811...Dave Handy....great guy, racers racer...web site www.sascosports.com
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Try Roger Kraus Racing $514 and $569. Tires go up with the price of oil. In February I was quoted $700 for 6 tires for my truck. I waited until October and paid $950.
Tom G.
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Anybody have the circumference of the two sizes of tires? Would be interesting to hear the before and after numbers of shaved tires.
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If you go to the Sasco site click on tires, then "vintage tires", all the dimensions listed by tire size.....
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Try Roger Kraus Racing $514 and $569. Tires go up with the price of oil. In February I was quoted $700 for 6 tires for my truck. I waited until October and paid $950.
Tom G.
Tom...I don't know how much oil is used in 6 tires but i'm sure its not a whole barrel which is currently about $100 a barrel.
To justify a $250 increase because of oil cost [if they used a whole barrel] a barrel of oil would be $350, and diesel would be $14 a gal.
JL222
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Try Lucas Tires, they sell takes offs very cheap when they have them www.lucasclassictires.com 562-595-6721 I bought some "18 for my '51 Indy car for about $100 per tire. This is an old list for used Dunlop's from their web site http://www.lucasclassictires.com/Dunlop082807_1704.htm Tony
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Try Roger Kraus Racing $514 and $569. Tires go up with the price of oil. In February I was quoted $700 for 6 tires for my truck. I waited until October and paid $950.
Tom G.
Tom...I don't know how much oil is used in 6 tires but i'm sure its not a whole barrel which is currently about $100 a barrel.
To justify a $250 increase because of oil cost [if they used a whole barrel] a barrel of oil would be $350, and diesel would be $14 a gal.
JL222
Hi John,
I really don't know what is going on, but I have been going to the same tire guy for the last 30 plus years. He is without a doubt the most inexpensive guy around me. In February I needed tires for my one ton dually and my Totorhome. I could not afford to buy them both at the same time but got quotes for both trucks. He told me he would only guarantee the price for two weeks because oil was going up and price increases were at least once and sometimes twice a month.
So I decided to bite the bullet and put tires on the totorhome, and they ran me $1800 in Feb. complete with installation. I just looked up the price of those tires, and the best price I can find now is $2300.
So I really don't know what is going on but I do know I am paying more for tires now than earlier in the year. On another note, they say we are not in an inflationary period, but I would disagree on what I have paid for tires. LOL.
Tom G.
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I haven't bought tires in a few years so don't have current information. When we got the new pickup two years ago it arrived with (factory) snow tires -- more aggressive than mud/snow, for sure. Those are fine for up here in the winter, but for the other six months I want "highway" tires, so bought a spare complete set (wheels and tires*) from a local HD tire shop - - that also sells to the iron mines in the area. That shop supplies retreads for all of the new trucks at the mines, getting the trucks when they're brand-new and swapping the factory (highway, 10-ply) for Bandag retreads. They then sell those unused take-offs to folks like me - for about $100/tire, installed. I haven't priced things since Jan. '09 - but whatever the cost, those new take-offs are a heck of a bargain. Got a local industry that does the same thing - equips new trucks with retreads? Call them before buying. :cheers:
*And having two sets makes it easy to keep good tires on the truck for the season, and I don't wear out the winter tires driving them on dry pavement. Easy to swap 'em at home, too - no tire changing machine needed.
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Try Lucas Tires, they sell takes offs very cheap when they have them www.lucasclassictires.com 562-595-6721 I bought some "18 for my '51 Indy car for about $100 per tire. This is an old list for used Dunlop's from their web site http://www.lucasclassictires.com/Dunlop082807_1704.htm Tony
Gave them a call just a few minutes ago and all they have left is 16".