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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 06-14-2005, 10:43 AM   #13321
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I use 29/100 gearing with Monster Stock with 3mm ride height with 1 ride height oval thingy in back. I gear my sedan at 7.1 too and it feels pretty comparable. You can go to about 30/100 before you have to grind your t-plate. 96 is an option, especially if you plan on racing 19t.
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Old 06-14-2005, 10:44 AM   #13322
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BTW, I lathe my rears to get it to that ride height once all the other things are set.
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Old 06-15-2005, 06:49 AM   #13323
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Quote:
Originally Posted by odpurple
Ceramics roll so much better than steel they are worth the extra expense. They are quite reasonably priced if you get them from www.kgbraceing.com
RC4less has good prices too. Don't forget the ceramic diff balls while you're at it!
i agree that the ceramics are that much better, but are they likely to last at that state 5 times longer? Most ceramics are 4-5 times more expensive then SS bearings. so if the ceramics last you 100 race days. I can through out SS one every 20 day and put new ones in. so will the ceramics be smoother then replacing bears five time more frequently? also on the dif balls. they are like $8 for 12. I usually find them for like $6 per 100. that means if i use 6 in a diff, i can just throw out the diff balls 11 times more frequent then the ceramic once. so do the ceramic diff bals stay round 11 time longer then ss. on diff balls, i usually run them 1 month and then chuck them at big races at $6 per 100. I can change diff balls every race and still be ahead.

I agree that the ceramics are harder and there for last longer but 5 time longer on bearing and 11 time longer on diff balls. I have not found that to be true.

Also if you are not skilled at 1/12 you will blow bearings on the rear axel more frequently, so at least on the hub side, i would use the SS bearing at $1 until you are not tagging boards.
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Old 06-15-2005, 08:00 AM   #13324
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Default Ceramics

Hello theisgroup, I am agree with you, I think I am a little skilled on racing, and I want the ceramics just for big events, for have some fun with my friends I will use standar ones. I have find boca-bearing ones, but can any one tell me if there are better ones? long time ago I bought a set for a gas car and there were really tight, the original ones were more free.
Thanks
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Old 06-15-2005, 08:11 AM   #13325
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I will being running the Hara Hammer 12 in 19 turn and i was wondering about foam size and gearing? Any ideas?
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Old 06-15-2005, 08:25 AM   #13326
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why would they put the screws in the ball cups? See pic.
Attached Thumbnails
1/12 forum-rc112-speedevil_4.jpg  
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Old 06-15-2005, 08:39 AM   #13327
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Quote:
why would they put the screws in the ball cups? See pic?
In the beginning we used the screws to minimize the play, but that is a old pic from a early pree production model. Now we mainly use O-rings or different types of ballcups.

Last edited by Team Laje Jonas; 06-15-2005 at 08:57 AM. Reason: Spelling
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Old 06-15-2005, 10:09 AM   #13328
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Quote:
Originally Posted by theisgroup
i agree that the ceramics are that much better, but are they likely to last at that state 5 times longer? Most ceramics are 4-5 times more expensive then SS bearings. so if the ceramics last you 100 race days. I can through out SS one every 20 day and put new ones in. so will the ceramics be smoother then replacing bears five time more frequently? also on the dif balls. they are like $8 for 12. I usually find them for like $6 per 100. that means if i use 6 in a diff, i can just throw out the diff balls 11 times more frequent then the ceramic once. so do the ceramic diff bals stay round 11 time longer then ss. on diff balls, i usually run them 1 month and then chuck them at big races at $6 per 100. I can change diff balls every race and still be ahead.

I agree that the ceramics are harder and there for last longer but 5 time longer on bearing and 11 time longer on diff balls. I have not found that to be true.

Also if you are not skilled at 1/12 you will blow bearings on the rear axel more frequently, so at least on the hub side, i would use the SS bearing at $1 until you are not tagging boards.
I mis-spoke when I said ceramics are better. I meant that they ROLL better. They roll better when they are new, they roll better when they are used. I have no doubts that steel bearings are cheaper, but if you get them from the right vendor they don't cost 5 times as much. When they wear out, I replace them, usually once a season-not so bad on the wallet.
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Old 06-15-2005, 10:41 AM   #13329
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Quote:
Originally Posted by Team Girth
I will being running the Hara Hammer 12 in 19 turn and i was wondering about foam size and gearing? Any ideas?
I've run my H12 in 19t, I start the rears at 48mm and the fronts at 46mm, outdoors on asphalt. I gear my Reedy spec 19 at 34/92, the guys I race with use around 37/96. Other motors will be geared differently.

Attached is a picture of my car after I converted it to damper tubes.

Last edited by odpurple; 07-10-2008 at 08:49 PM.
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Old 06-15-2005, 10:43 AM   #13330
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Hey OD,

you coming out to Modesto this weekend? We had a good turnout at Ripon last week, I was hoping to keep in rolling.

Chris.
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Old 06-15-2005, 11:09 AM   #13331
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Quote:
Originally Posted by crimson eagle
Hey OD,

you coming out to Modesto this weekend? We had a good turnout at Ripon last week, I was hoping to keep in rolling.

Chris.
We will be going Eagle hunting this Saturday...
Here is what the eagle will look like after the race:

Last edited by odpurple; 07-10-2008 at 08:49 PM.
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Old 06-15-2005, 01:03 PM   #13332
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OD

I don't suppose you would like to start a scoreboard of our finishing positions?
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Old 06-15-2005, 01:19 PM   #13333
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The only thing that will stop a THREE WISE MEN victory this weekend is the weather. Forecast is rain on Saturday.
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Old 06-15-2005, 03:44 PM   #13334
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Quote:
Originally Posted by crimson eagle
OD

I don't suppose you would like to start a scoreboard of our finishing positions?
I've never been much for record keeping. Taunting yes, record keeping, no.

Pray for rain, iggle boy!
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Old 06-15-2005, 05:11 PM   #13335
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Quote:
Originally Posted by crimson eagle
OD

I don't suppose you would like to start a scoreboard of our finishing positions?
Chris, I wish I would have ran at Ripon w/you guys instead of Speedworld. I ran one of EJ's cars and Qual 4th but came in last I got hacked too many times and don't think i'll be running a TC any time soon You NorCal guys keep up 1/12th and I hope to race w/you again.
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