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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!
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 05-02-2002, 12:09 PM   #901
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Hey DaveL how's the weather up there? Very good speed secrets I must say. BTW are you trying to tell us that you're only 44yrs old? Man, I thought you were....younger.hehehhehe Doesn't matter when you're fast though.
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Old 05-02-2002, 03:40 PM   #902
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Hello Dave,

My 12L is temporarily "up on blocks" I'm gearing up for the gas season and getting ready the Texas Biggie later this month. I do want to check out some carpet over the summer though so I can stay sharp. Yeah, the Mission has to go. I gave it my best and it's a good car, just not my style. I found a few tracks up north to check out over the summer that are running parking lot type stuff so I'm sure I'll stay busy!

BTW, I may be switching to a REV 3 soon if I can get ahold of Bruce.
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Old 05-02-2002, 04:44 PM   #903
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Hey everyone,

How's racing going? It all but dried up here in MN after the NORRCA Nats. The only thing we have now is sedans( bummer, I was just starting to get decent at 1/12 scale too-Thanks Darnold, you are the MAN!!!) I brought the 12L3 along just in case I could persuade two others to race with me-but no one brought their 1/12 cars along. WEAK. Maybe I'll get to this weekend, a guy whom I helped out at the NORRCA Nats with his 1/10 pan is going to try mod 1/12. Now all I have to do is persuade one other person to do it-Petenis is working saturdays now, and I don't know wether or not he can race. C'est la vive! I guess I'll just have to run like Darnold does-run between heats. I did break out the "taxi" as Jari calls them and did okay-third in the A main( I was winning until I got helped on my lid from lappers-now I remember why I went to 1/12 scale) . But it just isn't the same. Anyone who has driven one of each knows what I am talking about.

Hey, JohnnySocko, are you running in the Heart of America series this year, or is there another series that you are doing? 1/8 scale on road is another one of those classes that doesn't get near the publicity and hype that it deserves. I watched one of the MN stops for HOA and was blown away by the speed, good driving, and overall, good racing. There wasn't a dull moment. Holy crap, those cars can accelerate! I can only imagine what a rush it must be to wrestle one of them around-looks like heaps of fun!!! Anyway, good luck to you, sir!

I'll try to keep you posted about this weekend's events, wether or not I race "taxi" or mod 1/12.

Hey Darnold, tell whomever you are playing with to give you a couple of mulligans!

Have a good one, everyone!

Dave S
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Old 05-02-2002, 04:48 PM   #904
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By The way..

MR4 racer, how did the zero degree caster blocks work for you? I never heard back, and was curious as to wether or not it worked out for you.

Let me know, man.
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Old 05-03-2002, 06:33 AM   #905
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Hello Dave S,

I want to try 1/8th, probably next year once I'm done with the Worlds this year. I currently run 1/10th sedan both 235 and 200mm. HOA races are a little too far for me to go. I'll prob. run a couple Midwest Series races this summer. Do you run gas too? I live close enough now (just moved back from Dallas) that I'm def. coming up for Oktoberfast this year.

Darnold, yep the Mission has a "For Sale" sign in the window. Not a bad car, just not my style. You want a taxi? You should get one for the extra track time.

No racing for me this weekend, kid's birthdays. My daughter is 5 and my son will be 10 next week. Man, do I feel old!
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Old 05-03-2002, 09:41 AM   #906
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DaveS- James Arnold and I went out for my first round of the season on Mon. (his fourth). I shot par for the first hole and by the end of hole 5 (9hole course, par 32) I was only 8 over with some poor putting and beating James. Alas it was not to be as my putting really went into the tank and I four putted two of the last four holes and three putted the other two...ouch. James pulled ahead on hole seven and won. We play again tomorrow which will be my second round, I guess I should go practice some today huh? BTW have you tried that CORE 11x3 at 27/100 yet? If so how did it run compared to your other motors? Mitch and Jari are probably doing the gas car thing (1/8th) but I will probably be coming up there in late July or Aug. and I can let you know so that we can dust off the cars and get ready for Sept. How's your car doing by the way after all of the adjustments? Is Pete's ready for action? If so you two should run a practice night together. Hey give me a call. The number should be in a PM to you.

JohnnySocko- I didn't know you had kids let alone that old. You ARE getting old, of course this is coming from someone who's oldest could be nearly 20 but since I'm not married yet I don't even have any kids yet. Oh boy. Not interested in the Taxi yet although I'm getting a used B3 to have some fun a couple of times per month over the summer. If you come up to Venture with your 12th scale and let me know in advance I will put some pinks on the rear of my Trinity and run outdoors with you in 12th Modified. Let me know.
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Old 05-03-2002, 10:41 AM   #907
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HI Darnold,

Petenis' car is ready to rock and roll. He, however, isn't. He got a job at Mac and Don's steakhouse(McDonalds) and works Saturdays. Looks like practice is all he will be able to run. I just picked up a comm lathe, and will turn all of the mods tonight to be ready for Sat. night. I will let you know about the core 11x2 Sunday or Monday night. I will probably run it for two of the qualifiers, along with the 10x3 and the 9 single Axiom I picked up at the Nats. Talk at you soon, my friend. Good luck golfing!

Hi JohnnySocko,

No, I don't run gas cars, after watching them at the Heart of America deal, I figured I'd need to really polish up my driving and tuning skills. I will someday, but not anytime in the near future. Darnold can attest to how good I drive,as well as my tuning ability. Happy Birthday to your kids and good luck with the nitro taxi.
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Old 05-04-2002, 07:50 AM   #908
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i'm trying to set up my SP12G3 ans was wondering what does it affect when i shift the screw that holds the t bar inwards....i'm not sure what it really does but i think it would make the rear softer.....i'm just trying out some adjustment to get it dialed the way i want it...also i'm not sure if i'm even suppose to move the the mouting holes...hope someone understands what i'm trying to say...if not i'll have to get a digicam to show u guys
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Old 05-04-2002, 09:41 AM   #909
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Default 12L3 battery holder

Anyone come up with a permanent battery hold down system for the 12L3? I already have the velcro straps, but they rub on the carpet making the car react strangely. I was thinking about trying t omimic the Carpet Knife setup or just make a battery strap out of graphite, attach it to the rear cross brace and get a battery post from a TC3 or something similar. Anyone have any success with this? Just looking for something better than tape....it is getting annoying! Thanks in advance.
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Old 05-04-2002, 11:23 AM   #910
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Dennis.....I came up with a system for my 12LW....which would work on the 12L3 as well........I wish i had a way to take a pic, but i'll try to describe it to you.Basically, you are going to make a cross brace......remove the collar from the body post, this is where you will attach your cross brace(you will need to add the new body post to the dampner tube cross brace)the old body post are in the exact centerline of the cells, so the brace will fit perfectly across the cells.Your brace will need 2 holes in the ends to fit over the "old" body post....the cross brace should look like a "T" with the center part of the T being very short......but long enough to fit just past the lower dampner post,you need to put a notch on the T part of the cross brace, this will fit around the dampner post......after the brace is finished, install the cells and slide the brace on one body post, rotate the brace back towards the dampner post, push down on "T" part of brace, this will"snap" so to say in place,by now, the other side of the brace should be on the other body post,slide the brace down as far as possible,drill a hole in the body post, just above the brace,body clip goes in here......I "hope" this all makes sense.........I showed this to Socko one time...if he lives close, if he remembers what it looks like, maybe he can help........I'll try to get a pic
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Old 05-04-2002, 03:36 PM   #911
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Dave S- I got back from work at 3! racing doesn't start until 6:30! Where were you! I got cash now and CAN go racing! Oh well there's always next week, besides we'd be the only 12th scalers there, which would suck.

Darnold- well I haven't been on here in a while, and would like to say thanks for all the info! I just wish I had a tape recorder! I am now a P.O.W. (prisoner of wages- no offense to REAL veterans) but hey beats not getting paid right?

well its still kinda nice outside, so I'm going to let my bike throw me off big dirt jumps now.

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Old 05-05-2002, 11:10 AM   #912
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Hi to all:

I've bought a secondhand 12L3 and after reading all the 32 pages long thread I have some questions to you, 1/12th scale gurus.

Basically I use the 1/12 with an Big Jim MVP on a very short and twisty track with low grip. What type of setup should I use (about the gearing I'm plan to test later, by now I plan to use a stock MVP).

For the tyres matter I'm planning to order some magentas/purples front and gray/white rears from Jaco (Yokomo purples and double purples is what I use on front of my TC).
[quote=MugenDrew;2684554]BATTERIES are for FLASH LIGHTS, gasoline is for cleanin parts, alcohol is for me to drink and well NITRO...everybody know thats for racing.[/quote] :D:D:D
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Old 05-05-2002, 11:34 AM   #913
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Dennis.....After looking at the 12L3 manual....they already have the body mounts on the rear cross brace.....you may be able to drill a hole on each side of the chassis,where the battery brace post will be.
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Old 05-05-2002, 05:10 PM   #914
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Not sure if it has been asked before, but what is a good starter 1/12 scale car for a long time r/c racer. It will be raced on carpet with 4 cell 19T motor.
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Old 05-06-2002, 05:40 AM   #915
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Course-R & DCRacer- Basic setup for your 12L3:
Carpet= .075 T-bar(thick), 3deg caster, 1.5 deg negative camber, .020 front springs, some diff lube on damper disks, all thre screws in T-bar to motor pod connection if track isn't too bumpy, center screw out in T-bar to motor pod if track is bumpy, Gray rear tires with traction compound added for 20min then wipe off with a rag, purple front tires with inside 1/2 applied with traction compound for 20min and wipe off with a rag(do more of front tire if more steering is needed). Set diff so that gear doesn't slip but diff action is smooth, set rear ride height cams to #4 for rear tires that are 1.88 and under (down to 1.80inches) and use #1 for 1.96 to 1.88 inches. Front tires should be between 1.78-1.74 for bumpy tracks (use only one washer under each of the front mounting arm holes, and 1.74-1.69inches for fairly smooth tracks.

Outdoor/Low Grip Tracks: Same as above except use the .064" T-bar(thin) and Pink Rears, also let traction sit an additional 10min.
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