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Author Topic:   Tires
DeanHensler
Dirt Full Roller

Total posts: 52
posted November 07, 2005 03:21 PM  
The rules for my class say I can run

70 OR 75 SERIES DOT TIRES ONLY.
NO RACING DOT TIRES.
NO RECAPS.

What does 70 or 75 Series mean and what is the best tire to run that fits these rules?

Shess71
Dirt Roller

Total posts: 15
posted November 07, 2005 04:41 PM  
I RUN MASTERCARFT 235 70 WORKS GOOD ON ANY TRACK(DIRT) AND WHEN COMPARING THE WIDTH TO 60 SEIRES THERES ONLY 1/2" WIDTH DIFFERNCE

[This message has been edited by Shess71 (edited November 07, 2005).]

hotrodenford
Dirt Full Roller

Total posts: 70
posted November 07, 2005 04:50 PM  
70 or 75 series means the height to the sidewall. a 70 series tire has a sidewall height 70% of the tread width. so if you run a 235 width tire your sidewalls are ~165mm tall where a 75 series would be 176mm tall. I would run the 70's for the shorter side walls.

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If it has wheels or a skirt, you can't afford it! But they shure are fun...

Steve Dupree
Dirt Freak

Total posts: 374
posted November 08, 2005 03:24 AM  
I think one of the best tires out there is the Cyclone it has a A rating for traction and is a good lasting tire and if you want to gear the car right you could run a 265/70/15 it rolls out at about 91.25 and is as wide as a 255/60/15. Cyclones have one good looking tread design and are not that exspensive.

Normal Sullivan
Dirt Full Roller

Total posts: 66
posted November 08, 2005 03:26 AM  
Who makes 'em Steve?

trynmods
Dirt Full Roller

Total posts: 57
posted November 08, 2005 03:36 AM  
I run Mastercraft Avengers and Lemans SR. Both great tires. Every once in awhile I run a Firehawk (Firestone).

t_train75
Dirt Full Roller

Total posts: 52
posted November 08, 2005 04:57 PM  
You could also try a Bridgestone Winterforce tire. They are a directional tire but they have great grip. They work really good on muddy tracks. I think they were only like $50 a tire new.

Koolaid
Dirt Maniac

Total posts: 104
posted November 08, 2005 08:21 PM  
I saw the winterforce ones ttrain is talking about on tirerack.com - right around $50 each like he said.

The main thing to consider how your track is going to be - if it's really muddy then an aggressive mud/snow tire would be ideal. If the track stays dry get a more "performance" oriented tire.

DeanHensler
Dirt Full Roller

Total posts: 52
posted November 08, 2005 08:53 PM  
Most of the time it isn't too muddy. Little wet at the beginning of the night, but by the time the bomber class runs its usually dry.

oceanridge motorsports
Dirt Full Roller

Total posts: 46
posted November 09, 2005 03:15 PM  
Cooper cobras are a great street rubber choice , the mastercraft brand is the off brand from cooper , same tire, some times a little less $. Both work awesome .Look at what the front runners at your track are running , that will put you in the ball park .

Steve Dupree
Dirt Freak

Total posts: 374
posted November 10, 2005 03:56 AM  
Hey sullivan i will check today and post for you in the morning

Steve Dupree
Dirt Freak

Total posts: 374
posted November 12, 2005 04:34 AM  
Hey there Sullivan those cyclones are made by Sumitomo. Not sure what your local store will charge you but we pay between 48.00 and 60.00 depending on size we use. If you would like to see a oic hollor and i will take a close up pic for you so you can see width and read design. Have fun Steve Dupree

Normal Sullivan
Dirt Full Roller

Total posts: 66
posted November 12, 2005 04:17 PM  
Thanks Mr.Dupree!

DeanHensler
Dirt Full Roller

Total posts: 52
posted November 28, 2005 02:53 PM  
I'm assuming I want to go as wide as possible. A P255/70R15 seems like a big tire for a car. Do most people run a tire that tall? Thats the only size that I can find that will fit on a 15x8 wheel.

Steve Dupree
Dirt Freak

Total posts: 374
posted November 28, 2005 05:23 PM  
Hey dean you can go as tall as you want depending on what gear you have and what you want!!!!!!!!!!!! Always remember taller is the same as wider as far as traction. The more tire that sits on the track the more traction. We run a bad 275/70 15 on a 3/8 track with 650 gears and it is bad.

DeanHensler
Dirt Full Roller

Total posts: 52
posted November 28, 2005 05:39 PM  
What brand of tire do you run? I'm racing on a 3/8 mile as well.

mark46ew
Dirt Full Roller

Total posts: 33
posted November 28, 2005 06:36 PM  
Most guys at the track i run at use firestone firehawks or mastercrafts, The firestones dont last as long but have more grip.

Steve Dupree
Dirt Freak

Total posts: 374
posted November 29, 2005 03:26 AM  
Hey Dean i put it right above the are cyclone gt they have an A traction rating and a really good tread design and we pay about 62.00 for them. The 275/70/15 has as wide as tread design as a 255/60/15. The 275/70/15 has a 91.25 roll out and you will turn right at84 to 87 mph at 6300 rpm,s with 6.50 rear gear. Hope that helps and if you need help getting some just holler and i will check with our dealer here and see what we can do. Steve Dupree geminikid1@yahoo.com

J3
Dirt Freak

Total posts: 205
posted November 29, 2005 07:23 PM  
Those prices aren't to bad. We are only allowed to run Hoosier A-40 or D-40. They are around 115-125 per tire. Wish we could get our tires for around 50 bucks.

DeanHensler
Dirt Full Roller

Total posts: 52
posted November 30, 2005 12:22 PM  
Steve, do you have a picture of your car running those 275's? Thats like a 30 inch tire!

Steve Dupree
Dirt Freak

Total posts: 374
posted November 30, 2005 05:24 PM  
sure its on our yahoo id under pics. They are 91.25 around perfect for a 3/8 mile track. I dont have url but look on cars forsale and you will see one and click on that link and look at 1/4 mile day. We run a 235/70/15 at our 5/16 high bank track. They roll out at 88 or there abouts.

DeanHensler
Dirt Full Roller

Total posts: 52
posted November 30, 2005 05:51 PM  
I'm confused, what do you mean by 91.25 round and where do I go to see the picture?

quote:
Originally posted by Steve Dupree:
sure its on our yahoo id under pics. They are 91.25 around perfect for a 3/8 mile track. I dont have url but look on cars forsale and you will see one and click on that link and look at 1/4 mile day. We run a 235/70/15 at our 5/16 high bank track. They roll out at 88 or there abouts.


Steve Dupree
Dirt Freak

Total posts: 374
posted December 01, 2005 03:24 AM  
Dean send me an email to geminikid1@yahoo.com anf i will send you a few pics and explain around tall to you.

Well to help you on the around thing... When you buy or pic a tire lets say it is 29 inches tall then you multiply by pie or 3.14 to get how many inches around it will be. It is always better just to get a small rollout tape measure and check each tire and wheel and right it on the wheel so you know what you have.

The roundness of your tire will effect your gear selection or rpms you will turn. Just because you buy two tires the same size does not mean they are the same roundness so always measure them. Alot of cars need a little rear stagger to help them get through the corner good so thats why you want to know your roll out or circumference of your tire. If you need a few pics just send me an email to that addy and let me know you are from the dirt forum. Thanks Steve Dupree

DeanHensler
Dirt Full Roller

Total posts: 52
posted December 01, 2005 02:14 PM  
What size wheels do you guys run with these 70 series tires?

Steve Dupree
Dirt Freak

Total posts: 374
posted December 01, 2005 06:37 PM  
Dean sorry but had to go out of town today !!!!!!! got email and will send pics tomorrow. As far as wheels these run good on a 7" rim a 70 on a 8" rim will need more preasure to keep tread flat against the track. I will send pics tomorrow and sorry for being out of town. Steve

DeanHensler
Dirt Full Roller

Total posts: 52
posted December 12, 2005 08:43 AM  
Steve,

Thanks for the pictures. I'm really wanting to see what these things look like on a metric car. Anyone have any pictures of 70 series tires ON THE CAR?

Thanks.

Steve Dupree
Dirt Freak

Total posts: 374
posted December 12, 2005 11:36 AM  
Dean they will make you cream your jeans just order some or we will help you get some . lol There are a great tire and when you get them we will talk preasure you need to run in them. Take care guy!!!!!!!!! Steve Dupree

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