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This is a place to share knowledge related to 1/12th scale racing. It is not to be used for conversations.

KITS:
Click links to go to manufacturer product page. If any are missing please add them!

TIRES:
Pre-mounted tires readily available in the US:
Pre-mounted tires readily available in the Europe:
  • Hot Race ??

Gluing your own donuts:
https://www.youtube.com/watch?v=hm7z1rz-74s - Special thanks to Edward Pickering!
Truing tires:
https://www.youtube.com/watch?v=8wqHOLWq6Uc - Special thanks to Edward Pickering!

The following information came from HERE, with some editing and information added. Thanks Christian!

THIS MAY NEED UPDATING FOR THE NEW BLACK CRC CARPET

Brands:
BSR, CRC, Jaco:
Pro One is no longer selling to the public, but it and the brands above are all mounted by BSR and use the same foam. The nomenclature of the BSR vs Jaco/CRC is a little different in a few instances but is otherwise the same. The BSR foam consists of three families, and can be identifed as synthetics, naturals, and blends.

Synthetics - The old school, light weight, easy to true "dry feeling" tires. These include tires like CRC/Jaco Yellow (BSR White), Black, Gray, etc. These tires offer the highest wear rate and lowest grip. Many racers continue to use these nder high bite conditions.

Naturals - These tires are usually the best alternative for low bite and asphalt. They include Pink, Magenta, Double Pink, Lilac (BSR Team Purple), Purple, and other tires. These tires provide a ton of grip, but tend to get sticky in high bite conditions. This rubber does not wear as easily, and the cars will pick up gunk and fibers from the carpet under most high bite conditions. This is especially bad if the humidity is high.

Blends - These are the tires most people run today. They were initially called "JFT foam" by some, as it was believed that the tires were the same as the JFT tires. We can divide the blends further into two groups: high rubber and low rubber content. The high rubber would be the new rear Orange and Red from the BSR family, and the low rubber would be the Green and Blue varieties. When, asked about the difference, John Foister from BSR Tires said they came from the same "family" of foam, but they offered different grip. According to John, the Green/Blue has more bite than Orange/Red, but from track testing Oranges offer more bite than Green (being equivalent to in hardness) when the grip is high and absolutely no grip when it is lower. The Orange foam has a denser pore structure and the tire is not as prone to chunking. It is also important to note is that BSR Blue rears are not the same as the BSR Blue fronts!

JFT:
JFT stands for Japan Foam Tire. They started the new wave of foam tires we are all using now (Blue/Blu, Green/Greene, Dbl Blue, etc). These tires are a little different than the BSR tire family, but work in very similar conditions. They offers four varieties A (asphalt), C (carpet), S (???), and R (???). This does not mean that those types only work on that surface, but this is what they recommend.

JFT uses the same foam for fronts and rears if the color is the same.

A: Used on asphalt, considered close to the natural rubber variety and are named consistently with other natural tires.
C: Used on carpet, considered a blend.
S: Used on carpet?, tires are ???
R: Used on carpet?, tires are ???

For setup, the JFT foam seem to generate more bite than the BSR, therefore the car tends to be a little more aggressive.

Ulti:
Ulti is another Japanese brand that offers an array of compounds. They have their own way of rating tires, and are difficult to equate to other brands. They have 4 different varieties, each in varying degrees of hardness.

J: High rubber content tire, similar to Pink/ Magenta. Soft would be close to a pink. These offer the most bite and are great for asphalt/carpet front tire. (J hard being very popular)
X: "Balanced" blend, similar to JFT Blue/ Green. Soft is equivalent to Green, medium to Blue in hardness. Great for carpet!
Y: High synthetic blend with lower grip, and is not a very popular variety.
Z: A very expensive "special" foam that is supposed to be magic on asphalt. Only make it in soft shore.
European tires:
There are many great European foam tire brands that use their own types of foam, as well as traditional foams. SOmeone with more knowledge about them will need to fill this in!

Tire Diameter:
If you are racing on carpet, you have to evaluate how much grip your track has. If your track is low to medium grip, you can run bigger tires. If you are on higher bite you have to cut them smaller, there is simply no way around it. Bigger tires are needed for asphalt, especially in the rear. The larger tires provide much needed lateral bite.

Carpet (mm):
Low - Medium Bite
Front: 42.0 - 42.5
Rear: 42.5 - 43.00
Medium - High Bite
Front: 40.5 - 41.0
Rear: 41.5 - 42.0
Big Race
Front: 39.5 - 40.0
Rear: 40.5 - 41.0
Asphalt (mm):
Parking Lot
Front: 43.0 - 44.0
Rear: 44.0 - 45.0
Prepped High Bite
Front: 42.0 - 43.0
Rear: 43.0 - 44.0

Tire Saucing:
Most facilities have moved towards odorless traction additives such as SXT. Some of additives evaporate very quickly and some do not. This seems to be something that is also dependent on tire compound and ambient temperature. For example, saucing a Green compound seems like it never dries, especially when tjhe temperature is lower. We have found that wiping the tires off 15 minutes before we go run allows the sauce to cure, which makes the car come in much quicker with Green rears. Blue compounds on the other hand, do fine when wiped off right before hitting the track.

Saucing half front and full rear is a good initial starting point. If the front of the car is too agressive you can sauce les than half, or for a shorter amount of time.
Tire Fuzzing:
In conditions of increasing grip, foam tires will somewtimes get sticky and pick up fuzz and debris from the track. This is highly dependent on the rubber sedan tire that is being run at your local track and the compound/ type of foam you are running on you car. The softer the sedan tire and the harder/higher rubber content in your foam tire, trouble with fuzzing seems more likely to occur.

There are ways to get around fuzzing under most conditions, and usually involves the selection of the correct foam compound. The more fuzz you get, the softer/lower rubber content you want to run.

Examples:
Problem: Car fuzzes with Lilac/Team Purple fronts and car starts pushing.
Solution: Use a softer front tire and or different family of foam. Replace it with Blue or Double Blue front.

Problem: Car loses rear bite 6 minutes into the run. Blue rear tires look almost clean but have small carpet hairs.
Solution: Use Green rear tires. The softer compound wears instead of getting sticky, minimizing fuzz.

Tire Selection:
Starting out, pick 2 tire compounds for the front and rear. The following should have you covered 99% of the time.

Front - Green and Blue (BSR) or Green and Light Blue (JFT)
Rear - Blue and Double Blue (BSR) or Blue and Dark Blue (JFT)

You may wonder about other compounds out there and if they might be better, trust me, they probably won't be. Even if there are other tires that can be as fast, the synthetic family wears out really fast and the high natural rubber will probably fuzz on you over an 8 minute run. The blends family seems to be the most versatile foam type available today. They last awhile, and sticking to them will make your process of tire selection simpler.
Tire Charts:
BSR/CRC/Jaco



Contact



Corally



JFT (Japan Foam Tire)



Ulti



Enneti (Xceed)



ELECTRONICS:
ESC:
As of now, ROAR is staying 1S (3.7V nominal; 4.2V fully charged) for 1/12. There are many 1S ESC's with a built in BEC so nothing else is required to power the receiver and servo.

If you don't want to lock yourself into a 1S specific ESC, you do have other options! It is possible to use your 2S ESC without a booster or receiver pack, and the ESC simply supplies the lower voltage. If that does not appeal to you, you will need to use an Rx pack or booster. The Rx pack and booster will both supply the receiver with a higher voltage than the 1S pack.

If you decide to use an Rx pack, MAKE SURE TO REMOVE THE RED WIRE FROM THE ESC PLUG THAT GOES INTO THE RECEIVER!!!

If you choose to use a voltage booster, it works exactly how it sounds. Instead of plugging the ESC into the receiver, it plugs into the booster, and the booster plug goes to the ESC, supplying the higher voltage.

1S ESC:
If there are any missing please add them!!

If anyone would like a need for a chart comparing the ESC's specs PM fenton06 and I'll get one made and put in here!
Voltage Boosters:
If there are any missing please add them!
Servos:
BODIES:
Black Art (CRC - US Dist):
  • Audi R8C - BA002 - .020 Thick



  • Black Market (Mohawk 12) - BA005 - .020



  • Lola B10 - BA006 - .020 thick
  • Toyota TS030 - BA008 - .020 thick

    Lola - black/red, TS030 - green/pink


PROTOForm:

Reflex Racing/RSD:

SUSPENSION ADJUSTMENTS:

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Old 01-23-2008, 12:06 PM   #28051
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He's right the new rule book does show it at 880g for 4 cell 1/12th. I'm guessing this is a typo as the rule book used to have rules for both 4 cell and 6 cell in 1/12th and this was probably the weight for 6 cell.
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Old 01-23-2008, 12:19 PM   #28052
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I donno if that's a typo... these are screen caps of 2007 and 2008 1/12th rules page. Someone clearly intended to change this.

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Last edited by squarehead; 11-29-2010 at 04:00 PM.
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Old 01-23-2008, 12:41 PM   #28053
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It is a mistake. I just spoke to the ROAR Competition Director and he stated that there are no rule changes to 1/12th scale for 2008. It may be that some addendum documents were not merged with the old rule book when they created this years rule book.

The weight for 1/12th scale will remain 794 grams. Ruben just sent an email to Dawn about making the correction in the book

so we can all un-bunch our panties now
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Old 01-23-2008, 12:41 PM   #28054
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Huh, my car is ~900 grams anyway. There are a few things I could throw off the car, but that would give me 10-15 grams max. A few more grams could be saved by buying a new speedo (currently running on the big heavy GTB ).
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Old 01-23-2008, 12:45 PM   #28055
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Quote:
Originally Posted by odpurple View Post
It is a mistake. I just spoke to the ROAR Competition Director and he stated that there are no rule changes to 1/12th scale for 2008. It may be that some addendum documents were not merged with the old rule book when they created this years rule book.

The weight for 1/12th scale will remain 794 grams. Ruben just sent an email to Dawn about making the correction in the book

so we can all un-bunch our panties now

Whew! Panties officially unbunched!

Thank you!!!! Hehehe.
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Old 01-23-2008, 12:48 PM   #28056
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Nothing was done intentionally... Nobody clearly intended to make this change or neglect to make a change.....

in fact, I, personally, reformatted the rule book for 2008 with the information I was provided and tried to find in all sources. The regular source of gathering information was not available to me in two weeks time from my taking this job and getting the book out. (I missed the deadline by 2 weeks as well...LOL)

My sincere apologies for NOT noticing the 1/12th weight adjustment. I did this reformatting as quick as I could and well, when humans are involved, mistakes do happen.

I will see to it that a news item addendum is on the website and the online version of the book is corrected. The printed version will have the misprint as the book is at the printer RIGHT NOW....

again, I am sorry.
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Old 01-23-2008, 12:50 PM   #28057
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Thumbs up

No problem, Dawn. I haven't raced 1/12th in over 2 years and am trying to prepare a car for this weekend that runs "current ROAR rules" and couldn't figure out how my car got so light.

Keep up the good work.

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Old 01-23-2008, 01:08 PM   #28058
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Quote:
Originally Posted by ApexSpeed View Post
No problem, Dawn. I haven't raced 1/12th in over 2 years and am trying to prepare a car for this weekend that runs "current ROAR rules" and couldn't figure out how my car got so light.

Keep up the good work.

well, it is a problem and I hope its the only thing that got missed.... if not, we'll hear about it...

and luckily we have the NEWS item on the website.

Wish I would have been born with that "perfect" gene.... LOL
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Old 01-23-2008, 01:14 PM   #28059
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Quote:
Originally Posted by Dawn Sanchez View Post
well, it is a problem and I hope its the only thing that got missed.... if not, we'll hear about it...

and luckily we have the NEWS item on the website.

Wish I would have been born with that "perfect" gene.... LOL
Reformatting a rule book is a prodigious task, I know, having done some small ones myself. I think every 1/12th racer I know will be happy to scritch out the mistake with no complaints! Thank you for doing a fine job
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Old 01-23-2008, 01:19 PM   #28060
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Quote:
Originally Posted by odpurple View Post
Reformatting a rule book is a prodigious task, I know, having done some small ones myself. I think every 1/12th racer I know will be happy to scritch out the mistake with no complaints! Thank you for doing a fine job
thanks..

scritch away.. the online version will be corrected as soon as I can get it uploaded...

I don't think I can change the printed one. I was able to make a change just this morning of a typo I made..... but I think its past time where I can get another change in.
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Old 01-23-2008, 01:27 PM   #28061
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Quote:
Originally Posted by Dawn Sanchez View Post
Wish I would have been born with that "perfect" gene.... LOL
I thought all women are perfect? That's what my wife keeps telling me.

The same thing happened in the rule book last year. Someone omitted the 794g 4 cell weight and left the 880g 6 cell weight. Just one of those little things that needs to be fixed.
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Old 01-23-2008, 01:34 PM   #28062
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Quote:
Originally Posted by jiml View Post
I thought all women are perfect? That's what my wife keeps telling me.

The same thing happened in the rule book last year. Someone omitted the 794g 4 cell weight and left the 880g 6 cell weight. Just one of those little things that needs to be fixed.
well, it happened this year because the final version of the book in Word format was never forwarded to me as I asked... (yep, pointing fingers!! LOL)

I tried to convert the online version from .pdf back to Word.. and oh man, formatting nightmare.... so, I went page by page with the Excom in our meeting a few weeks ago and we caught 99.9% (I hope) of the changes and then I went page by page in front of the computer.

You guys should check out the RMT National Guidelines.... totally new format because that was 23 pages I had to type in, word for word.... (I redid it into 17 pages though) - if you find mistakes there.. email me... I just got those online and I think I caught most of it.. will be making several corrections tonight.

This time, when I make the change.. it'll get sent to our Administrator AND will be on the 'jump drive' for my position and it will get transferred should there be a new president next year.

Most women are perfect. I've been told I'm not like most women... LOL.. and I thought that was a compliment... LOL
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Old 01-23-2008, 02:20 PM   #28063
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You need a PDF editor software
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Old 01-23-2008, 02:48 PM   #28064
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Quote:
Originally Posted by InspGadgt View Post
You need a PDF editor software
have it....

I didn't give the whole story... the last version was done on a Mac and saved into a Word version that is older than dirt.

I have Vista and 2007 editions... and the latest Adobe stuff... name it, I have it....

when you go from ancient to new - it can be done.... but not easily. Takes time... for me, the easiest thing to do with the National Guidelines, all of 17 pages and 8,000 words was to redo the whole thing. Less frustrating.
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Old 01-23-2008, 03:44 PM   #28065
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Once it is in PDF format it shouldn't matter what format it was in previously. You should be able to edit it directly still in PDF format with Adobe or another PDF editor. I think we used something called Scansoft for that.
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