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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 12-20-2003, 07:17 AM   #5656
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Default Re: Foam tires, Receiver and esc for 12L3

Originally posted by elmer20
What would you recommend for foam tires, receiver, and esc for 12L3 racing stock.
for reciever, go for the smallest!! Novak XXXL or the new reciever from KO that comes with the Helios!! Its as small as an LRP Quantum!!
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Old 12-20-2003, 10:59 AM   #5657
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Default crc 3.2 set up and roll out

I was hoping one of you would give me a few setups and a roll out chart for the crc bloody knife..... Thanks in advance......
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Old 12-20-2003, 11:15 AM   #5658
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www.teamcrc.com that is the calandra website. he has a gear chart on there also some setup for the knife
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Old 12-20-2003, 03:53 PM   #5659
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Default tweak board

wondering where to get good tweak board running1/112 scale.
tried integy but had to take back to lhs.
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Old 12-20-2003, 04:12 PM   #5660
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Default Re: tweak board

Originally posted by rattlr2
wondering where to get good tweak board running1/112 scale.
tried integy but had to take back to lhs.
MIP makes a good one but if $$$ is no object, take a look at the one made by Unity Tool. With it you can check caster, toe and tweek. It will work for 1/12, 1/10 and 1/8 scale. You can find them at www.unitytool.com.

**Record setting carbon fiber**

Speedmerchant and TOP USA dealer.
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Old 12-20-2003, 05:48 PM   #5661
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smallest FM stuff you can afford

Either an LRP QC or a GT7. LRP preffered because they are smaller.
What about the Mtronik M3 cubic?

That thing is tiny! I haven't heard good or bad about them.
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Old 12-20-2003, 07:05 PM   #5662
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Originally posted by R/C Lidz
What about the Mtronik M3 cubic?
I know a guy that uese one and he loves it.
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Old 12-21-2003, 02:16 PM   #5663
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Default Rear droop??

When do you run droop in the rear of the car? Is droop for bumpy tracks to keep the rear tires from chattering? Will adding droop add rear traction as well I mainly run on asphalt.

TopRacingUSA | Team EPIC | Thunder Power | OD Racing
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Old 12-21-2003, 08:11 PM   #5664
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Default Rear Droop??

Basicly when you squeeze the triger the front of the rear pod lifts up. If the center shock is to short and does not allow this to happen you will spin out when you accelerate. Generally run about .5 to 1.5mm fo droop in the car. To measure this the back of the pod should be lower than the chassis when the car is lifited in teh air.
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Old 12-21-2003, 08:50 PM   #5665
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new to 12th scale just got yrx-12we on line just wondering what I need to do for carpet setup. How is right out of the box for carpet what tires springs ect.

Thanks in advance.
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Old 12-21-2003, 09:44 PM   #5666
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new to 12th scale just got yrx-12we on line just wondering what I need to do for carpet setup. How is right out of the box for carpet what tires springs ect.
Nice choice...I also run a yok worlds car. Ill give you some of my setup to try. I run on a medium bite tight carpet track running 19t spec motors.

Front - 20 springs, old skool front end, 3 - 3.5mm ride, Jaco purples

Rear - Batts back, red spring, 30wt oil, diff lube on the disc, 3 - 3.5mm ride, Jaco grey

That should get you started. Since the car has a lot of flex, it seems to be very forgiving on setup. So basically if you have the right tires for your track (usually purple/grey works best) the car will run fine. I have been through tons of setups with this car and right now, its the best its ever been. Seems to be the car to beat at my local track, and I like being the only one running the yok. Hope that helps you...feel free to email me for any further questions about the car.
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Old 12-21-2003, 10:34 PM   #5667
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come on paul, you are supposed to know that.
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Old 12-21-2003, 10:37 PM   #5668
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ok well on a serious note...

I would like to know more about dampener tubes on the 12th's. Just mainly, general information about them. As in, what grease to use, what the car does when you change to different greases. Things like that. Thank.
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Old 12-21-2003, 11:20 PM   #5669
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Default Associated Chassis Protectors

Does anyone know of someone online who has the Associated Chassis Protectors in stock. I've done some hunting and I think they may have discontinued them. Does anyone else make a similar product? Do they really work?

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Old 12-22-2003, 02:21 AM   #5670
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What body are you guys using? Anyone has experienced the differences between Protoform's Sd 8 LMP and Ascari LMP handling characteristics? Also what body are associated's team drivers running? Thanks
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