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Last edit by: fenton06
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!
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


Reflex Racing/RSD:


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Old 07-12-2006, 10:46 AM   #19276
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Originally Posted by ApexSpeed
Oh yeah, I forgot about those. I guess I blocked them from my memory.

I wonder why CRC went back to a design on the High Rollers that would allow the nut to hang out in the open?
Actually if you compare the 2 mounted up on the car (where the bearing mounts in comparison with the outer edge of the rim), they are the same. they are drawn to the same dimensions. It just appears the nut sticks out further on the HR's because of the shape of the wheel's spokes vs the flat face of the dish wheel.
Team CRC, Spektrum, Hobbywing, JDJ Vinyl Graphics, Moby Graphix, Black Art, Power Push
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Old 07-12-2006, 11:25 AM   #19277
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wingman2 what car is that. i am new too twelth scale i bought the bloody knife 3.2 version i thought it was the best car they have am i wrong? that car looks awsome with the batt runnin down the middle what version is it? i ran a losi sedan with the batt in the middle the car was hooked up it handle real well. thanks
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Old 07-12-2006, 11:30 AM   #19278
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Originally Posted by wingman2
Hi all, wanted to post a pic of the a new 12th car that I'm gonna give a go this winter series and wanted to see what people thought. There will be damper tubes on to control the rear end when they eventually turn up in case you were wondering...

Any thoughts?

Let me know what you think.

Cheers guys,

I like that layout with the batteries, pretty cool.
Up the Irons \m/

Powered by Hotwings, Rolling Rock, and the urge to race toy cars...
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Old 07-12-2006, 12:01 PM   #19279
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wingman2 what car is that?its pretty sweet with the batts down the center
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Old 07-12-2006, 01:23 PM   #19280
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The chassis is a Diggity Designs D12. It comes as a conversion kit for the 12l4 or CRC kits. I have to say guys, it went together with no problems at all! I wanted to try a chassis with the cells down the middle, I found a German chassis maker (Ascari) but they did n't seem ready to sell any kits and an American company called Diggity Designs. This is their D12 kit. It normally has one damper tube across the chassis to control roll, I have modified mine to accept two damper tubes but apart from that, its stock.

Certainly a differant layout to all the usual chassis's out there, lets hope it goes as good as it looks!!

Cheers guys,

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Old 07-12-2006, 01:34 PM   #19281
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DiggityDesigns is based out of Grand Rapids, MI. Really nice folks and they put a lot of thought into their conversion kits. He also has a really nice tc3/tc4 conversion kit.


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Old 07-12-2006, 04:10 PM   #19282
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Has anybody heard anything about the hotbodies 12th scale they used at the worlds?
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Old 07-12-2006, 04:20 PM   #19283
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Wow, you are in Poughkeepsie? That's where I grew up - went to Spackenkill HS (graduated back in 1991). Paul C. from Parma is from Wappingers Falls. Where is there a track there?

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Old 07-12-2006, 04:27 PM   #19284
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I live 10 minutes from the high school. Rampage hobby has a carpet and off-road tracks. we are trying to open another carpet track in poughkeepsie.
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Old 07-12-2006, 09:18 PM   #19285
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Originally Posted by bigb11
Has anybody heard anything about the hotbodies 12th scale they used at the worlds?
i havent seen any pics... is it different than the AH Hammer12?

Team Novak
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Old 07-12-2006, 10:18 PM   #19286
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Originally Posted by bigb11
I live 10 minutes from the high school. Rampage hobby has a carpet and off-road tracks. we are trying to open another carpet track in poughkeepsie.
my brother lives right down the road a bit next time im out i will have to check it out
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Old 07-12-2006, 11:59 PM   #19287
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Originally Posted by protc3
i have been using the xxx w green springs with alot of success.i put a .030 verticle slot in the brush.F brushes also work good full face w/ red springs.i mostly go the xxx route though
Thanks Jason!
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Old 07-13-2006, 04:18 AM   #19288
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Help - Need Teflon Tape...

Anyone know what company distributes thin single sided teflon tape? Want to use it for the rear upper pod plate for a 12L4...
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Old 07-13-2006, 04:27 AM   #19289
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Buds racing probably still sells teflon tape, at least they used to. CRC also used to sell teflon discs for assoc type rear end cars.

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Old 07-13-2006, 04:27 AM   #19290
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Just a thank you note to all who gave me some setup tips a few days ago before our local NATS. The advise helped and I managed to finish 2nd overall.

Without wanting to sound dumb, do you guys use brakes, drag brakes on 1/12th? I mean slowing down for a corner?
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