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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.

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

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!


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 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 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.

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:



JFT (Japan Foam Tire)


Enneti (Xceed)

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 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.

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!


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Old 10-31-2004, 07:25 PM   #9031
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1/12 pan cars?

I have just recently gotten into this whole R/C thang by getting a XXX-NT this summer and haven't gotten a chance to race but now everybody is closing down adn am now looking for indoor. my question is can you run a regular pan car in both road course and oval? there are a few carpet courses in the area and I would hate to spend money on one style and relize that I would rather run the other instead.. I guess what I'm really asking is there a good dual purpose car on the market and if so what are the purpose? Thanks
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Old 10-31-2004, 07:34 PM   #9032
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You could run a 12l4 or similar car in oval, but it won't work as well as a dedicated oval car would...
Do or Do Not, There Is No Try
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Old 11-01-2004, 07:56 PM   #9033
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Default 12L4

I am confused about when to use the heavy T bar and the light T bar? Which one is used for carpet and which one is used for asphalt? Does anyone have a good set up for both asphalt and carpet. I need a set up for the snowbirds and my local club which races on asphalt.....thanks
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Old 11-01-2004, 08:25 PM   #9034
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The thick t-bar is for Carpet (high bite), the thin one is for asphalt (low bite). In general, you want the car softer for low bite conditions. This means thin t bar, soft shock spring, thin shock oil, light damper lube. For carpet you go heavier on all those items. For carpet try: thick t-bar, 60wt shock oil, blue shock spring, .022 fr springs, 100wt on the disc. For asphalt try: thin t-bar, 40wt shock oil, AE silver shock spring, .020 fronts. These are just a starting point.
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Old 11-01-2004, 08:57 PM   #9035
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Whats a good target rollout for a track 100 by 60 and a monster stock? Can I get that in mm and inches?Thanks!
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Old 11-01-2004, 11:11 PM   #9036
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nesacuby - Try around a 42mm rollout. I'm sure you can convert it into inches yourself.
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Old 11-02-2004, 04:37 AM   #9037
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Thanks odpurple.......
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Old 11-02-2004, 07:29 AM   #9038
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Thanks Fatdoggy!
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Old 11-02-2004, 02:34 PM   #9039
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Default Legal ROAR width?

What is the ROAR legal width? I am running the 12L4, Parma tires, stock axle.

How many shims?

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Old 11-02-2004, 02:57 PM   #9040
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Default Re: Legal ROAR width?

Originally posted by CarpetRacer
What is the ROAR legal width? I am running the 12L4, Parma tires, stock axle.

How many shims?


ROAR legal rear width is 6 3/4". Assemble with one or two shims on each side, check your width and adjust from there. Make sure that you keep it centered evenly.

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Old 11-02-2004, 03:15 PM   #9041
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Old 11-02-2004, 03:34 PM   #9042
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Shock oil?

How much shock oil do you put in the shock? In the directions it doesn't tell you how much to fill the shock body.


I am new to 1/12th scale if you couldn't tell! LOL
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Old 11-02-2004, 05:29 PM   #9043
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ok i have a switch harness, some cells, and now i just need to know how to wire up a reciever pack, and how i should plug it in.

also, is 5 or 6 cells prefered, i know that it will just speed up the steering with the extra cell, but what are your thoughts?

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Old 11-02-2004, 08:55 PM   #9044
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Peter, IMHO the best way to hook up a reciever pack would be not to use a switch but to just use a plug and save weight.
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Old 11-03-2004, 01:54 AM   #9045
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What pinion do you guys use with 64pitch 100 tooth spur, for a monster stock?

The instruction says to put a 35 tooth pinion, but it dosen't fit!
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