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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 10-06-2003, 09:52 AM   #4276
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Good job, Casey. Let me know when you catch Lufaso and VanWagner.
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Old 10-06-2003, 11:19 AM   #4277
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Man am I pumped to get my carpet knife running again for the 12th scale season. My track is finally getting a 12th scale class going, and it looks like there will be a lot of people doing it. All I need to do to get my car ready is install the reciever, install the esc, build one more battary, paint a body, and get a set of tires trued down. I should be able to get that done in a day or so.

Here's a problem I had the last time I ran it. My VCS center shock keeps coming apart. It will come apart on a very light tap to the pipes. I think the little star shaped clip that holds everything in is worn out. I'm going to try replacing it. Has anyone else ever had a problem with this happening?
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Old 10-06-2003, 11:32 AM   #4278
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no not any one that i know either!
Pemberton / R1 / All out motorsports / Team Power Push
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Old 10-06-2003, 11:32 AM   #4279
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Dave, I got them covered
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Old 10-06-2003, 12:46 PM   #4280
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Default Dx6

No problems with my center shock or the two on my RC10L3. Use the tool that came with the shock, make sure its "In the groove".

Have fun. I race my first 1/12 of the season this monday night. I bought my 11 year old son a used 12L3 for $75.00. He doesn't know it yet.
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Old 10-06-2003, 12:52 PM   #4281
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racerDX-when the star clip goes-that shock will NOT stay together-so I would get a rebuild kit from AE and just replace all the innards!!

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Old 10-06-2003, 03:46 PM   #4282
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I have picked up a pair of Jaco "Aqua" compound. Anyone ever use these? Comments?
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Old 10-06-2003, 05:14 PM   #4283
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Rev. 3 Instructions Confusion...

I am building my first rev3 and I have a question about the servo saver/turn buckle location. The instructions say "Mount the tie-rod ends to the front of the servo saver..." Does this mean the ball ends on the servo saver point forward? If I do this and have the front of my servo case aligned with the rear of the front arm mounts, my steering tierods are like this / \ however if the instructions mean to have the ball ends point rearward then my tierods will look like this - - which is what i *think* they mean. Anyone know the answer for sure?
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Old 10-06-2003, 05:27 PM   #4284
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The ballstuds should be facing front, so (although its an exagurated angle) like this: / \
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Old 10-06-2003, 05:29 PM   #4285
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Cracker-you want the tie-rods to point forward like that. That is normal. But having said that-I do know a really fast driver whos links are straight-so maybe its driver preference!!!

David Lee-Thank you so much for coming to race at the Gate. It was awesome to run in your qualifier. Your very fast-very smooth-very consistent. I had a whicked fast Rev3 yesterday-but mediocre driving kept me from doing what the car was capable of-Bummer!!

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Old 10-06-2003, 06:45 PM   #4286
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I don't really remember any tool that came with the shock kit, but I'll look again. I'll probably just pick up a rebuild kit anyway for the shock.
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Old 10-06-2003, 06:50 PM   #4287
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dx- The shock kit should come with a around 2" long skinny metal stick (like graphite that you would put in a mechanical pencil) that is used to pop out the retainer. But a rebuild kit is probably the best idea, since its cheap and a smooth well built 12th scale shock is very important.
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Old 10-06-2003, 06:54 PM   #4288
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Default Tire truer

What tire truer you guys are using?
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Old 10-06-2003, 07:02 PM   #4289
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Oh yeah.......... I remember that "tool". Yeah I still have it. I think I'll go try getting a perfectly built 12th scale shock now . Thanks stormperson.
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Old 10-06-2003, 08:09 PM   #4290
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akrcracer- I remember aqua from a few years back high traction low wear? If it's the same stuff.

speedxl- I got to tell you, cause you would understand. I had the opportunity to run some rug yesterday, and I finally was able to run my Q12 and was it hooked up I was able to make the A, our first Sunday carpet race. I will find some extra horsepower and practice real hard and clean up! I can just feel it, it handles so good. Anyway thanks for listenin
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