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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 04-01-2002, 06:26 PM   #811
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YUP! You got it exactly I use to do Practical shooting and I had several raceguns all in super38 and also competed in stock (10mm)
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Old 04-01-2002, 06:36 PM   #812
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Old 04-03-2002, 01:38 PM   #813
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you really need to work less and get on here!!!!!!!!!!!hehhehehehe just kidding. So, whats everyones racing been like lately? I have gotten about 4 guys in my area to want to race MOD, and the one other guy wants to race stock but I told him I would give him a mod motor so he could run with us. Thats a class in my book!!!!!!!!!!!!!!!!!!!!!!!!!!Now I just need to get my batts and I will ready to roll.
P.S.Anybody else have the new Trinity Reference Speed 8 body on back order????????I DO!!!!!!!!!hehehhehe oh its so exciting
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Old 04-04-2002, 10:00 AM   #814
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Foams- Got on up at the office here for a moment but I actually have a meeting with some clients in about 15min. hehehe. Are you going to take the offer from your dad so that you can race more? Hey, are you now going to make the Norrca Nat's, hint, hint LOL! I just bet that there is some hotel room open and they are allowing registration at the track with no penalty and...and... oh well. LOL
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Old 04-04-2002, 12:26 PM   #815
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I am home right now from lunch FROM MY NEW JOB!!!!!!!!So now that I have a new job and EVEN MORE MONEY I can race more. Still a no on the NORRCA nats. So, it looks like I may get my LIFE back. BOUGHT time. anywho i gunna go back to work now. L8ter.
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Old 04-05-2002, 05:39 PM   #816
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I guess that you won't see me at the Norrca's! I gotta stop racin for awhile in order to work to get a real car. I'll still go watch my brother race there, I will just not race.
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Old 04-06-2002, 09:11 AM   #817
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Petenis- Looks like I will actually get a chance to see you race if you come out to the club race next Saturday! I will be up there next weekend (Fri. & Sat) plus the following weekend for the Norrca Nats. Is Dave S. is your little brother ?

Foams- Glad to hear it. Maybe Petenis will take videos of the 12th scale qualifiers and mains at the Norrca Nats and upload them here for people to see what 12th scale action is all about. hehehehe('').

What do you say Petenis?('')
Might be off to race now so let me know Petenis. Even if you can't come club race next Saturday at TCHR or Practice Friday evening maybe you can come up to the track and rap.- Dave Arnold
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Old 04-07-2002, 03:58 PM   #818
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We had our grand opening race this weekend.......probably some of the closest racing we've ever had....at any time there was a freight train of atleast 4 cars..........In the main, I was in control of second and the leader went out......so there i was...leading,and i get hit in the side and my switch is shut off......losing 3 laps figuring this out...Now...i'm on a mission...i ended up getting 2 back....lotsa fun .....Tony Phalen was in town and stopped by to race with us....but didnt bring his 1/12.....He was freakin' flying in Mod Sedan...DANG.
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Old 04-08-2002, 10:20 AM   #819
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Dragon S- Hey what's up and how have things been going? It's great to hear that you have 12th going on, was it mod or stock or a mix of "run what you brung" like the old days? How big is the track out there again? We're about to be done with indoor carpet in about another month and a half but we will be able to race outdoor 12th on treated blacktop. Last year Jucha and I ran a couple of times before he went off to the outdoor Nats and we had a blast. I actually only changed 3 settings from my carpet setup so I may try a couple of Sundays out there with similar changes and see whats up. All it should cost me is a set of Pink dot rears. I even have some Assoc. chassis protector film. We'll see.
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Old 04-08-2002, 10:26 AM   #820
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Petenis- While I should still be at the Norrca Nat's my Grandmother passed away this past weekend and the funeral is not going to be until this upcoming Sat. so I won't be up there for the club race like I had planned.('')
So do you know what the layout for the Norrca Nats is going to look like at all? hehehehe

Foams- When you send them my plan is to do one and prep certain parts for the other one but let you do that one. I'll write everything down and send it back. How was the racing this weekend? Give me a call if you can.
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Old 04-08-2002, 01:52 PM   #821
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how do u guys gear using 6 cells with 23t stock???what about 6cells 12x2 ....i was thinking of running at a very large track where it's meant for 1/8th scale
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Old 04-08-2002, 04:55 PM   #822
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Darnold......we run 4 cell with Chameleon motors......our track is 36' by 62'........
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Old 04-08-2002, 05:03 PM   #823
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Anyone here tried or seen the corally sp12m run? how does it do?

Also what about the calandra carpet knife? I'm askin cuz we might soon have an outdoor asphault track, uh, 100 x 60 and some of us wanna run 4 cell stock

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Old 04-08-2002, 08:43 PM   #824
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Hi Darnold,

First off, my deepest condolences on the passing of your grandmother. I hope you and your family are doing OK.
Petenis is my little brother. I probably will end up attending the NORRCA Nats in stead of him. My motor will be payed for this week and I just itching to get back into it. Oh, just in case you were wondering, the last time Petenis ran(about a month ago) I saw Jari Taskila had returned, just as fast as ever! I still am undecided as what to run... It will definately be a 1/12, but stock or modified? I ended up in the b-main in Oktoberfast in stock, and I haven't run in modified for at least a couple of months. The 12L3 I am currently running is set up for mod, but alot of the guys don't change their setups very much for stock. I don't know, I have two good motors and I can borrow Petenis' motors if Iget into a pinch. What do you think? I will leave it up to you guys. I won't get near the A-main in either one, but I have so much fun anyway, it doesn't really matter. Let me know by Friday what you think. I leave this open to everyone.
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Old 04-09-2002, 07:25 AM   #825
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Where and when is the NORRCA Nats?
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