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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 10-11-2006, 06:34 AM   #21196
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Originally Posted by David Galdo
That's because you are broken most of the time.

Yeah the BLs, but I did get back on the track to finish my day out. And this time I will have a back up If I need it.

He is not coming. He talks smack and then backs out. He told me that he was not coming the other night. David mention that he was going to some race up north. Hey yang it will be just you and me battling it out as usual.
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Old 10-11-2006, 07:00 AM   #21197
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Default rollover

Originally Posted by Jon Kerr
OK guys. Complete 1/12 scale rookie question here. Do you use the roll over antenna with a Spektrum Rx? Does anyone really use the fiberglass antenna anymore?
NOt only do you still need it-you still want it at full height. Dont cut it too short or you'll have a pile-o-12th if it rolls over and hits a board upside down!! Jon-I am not kidding, a 12th without a rollover can go 20-30' once it goes shiny side down!! Boards do not seem to impede it-only dessimate it.
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Old 10-11-2006, 07:34 AM   #21198
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roll over antennas make me want to fly a flag from it.
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Old 10-11-2006, 07:39 AM   #21199
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Thanks Randy and Ray. Almost done with the car. Just need to set it up and get a body mounted.
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Old 10-11-2006, 12:05 PM   #21200
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Originally Posted by revzalot
Kyano what's SP-4335Y for T bar? Where can I order the parts in the US?
Has anyone used the Yokomo part SP-4335Y?

what's the idea behind it?
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Old 10-11-2006, 02:01 PM   #21201
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Default Rear End Width

Ok, this might seem like a lame question... but I'm just getting a 1/12 car together again...

The car I have is basically an L4 with a screw on left side hub on the axle... I've compared the rear end of my car with a few of the other local guy's cars and notice that the rear end of my car is significanly narrower than theirs.

What is the general rule of thumb on the rear end of your car...? Make it as wide as possible?

Do different brands of tires have different offsets?

Sorry for all the noob questions...it's been ages since I've run 1/12 and don't really have a local 1/12 guru to talk to about it all
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Old 10-11-2006, 02:26 PM   #21202
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hey steve,

if you run parma tires,the rear will be extremely narrow.they have about a 2mm offset on the wheel.generally i make the rear about 168mm wide for asphalt.
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Old 10-11-2006, 06:21 PM   #21203
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Originally Posted by theisgroup
that is amazing. Tim ran some 2 stage dbl pinks last time we were down there and only got one day out of them also.
Yang, I use 2 pr fronts and 1 pr rear all the time. The fronts wear twice as fast here for some strange reason. Just alternate front pairs after each round.

pray for no Rain
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Old 10-11-2006, 06:27 PM   #21204
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Hey Steve Weiss ygpm 12L4 info for ya
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Old 10-11-2006, 06:27 PM   #21205
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i had the same problem with front tire wear.i finally tried going to 5000 wt. diff oil on the kingpins and my tire life and handling increased dramatically
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Old 10-11-2006, 06:47 PM   #21206
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Originally Posted by P2

pray for no Rain
Is there another weekend planned if it does?
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Old 10-11-2006, 06:57 PM   #21207
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As far as I know, there is not another weekend planned for it. Clark has not mentioned it at all.
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Old 10-11-2006, 06:58 PM   #21208
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Arrow lid

speed 8 for my rev4.5
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Old 10-11-2006, 07:34 PM   #21209
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Originally Posted by radio_car_racer
Has anyone used the Yokomo part SP-4335Y?

what's the idea behind it?
no tweak screws.

i ordered one 4 days ago

it's about 45 items down

Use of the Tweak Plate allows easy tweaking of the t-bar. Available in different sizes to suit various track conditions.

Masami used this on the RC12L4Y he won with in 2004 IFMAR WORLDS


calls theirs a NTS (no tweak system) t-bar bracket on their SE07-12
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Old 10-11-2006, 07:45 PM   #21210
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Can someone please give me the basic differences between the CRC CK 3.1 and 3.2R? I have about an 85% complete car. I have the rear pod and complete rear axle, chassis, and front end. I am just missing some pieces to join the pod to the main chassis, shock, damper tubes etc. I am looking at picking up a used 3.1 for pieces.
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