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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 01-09-2003, 06:11 AM   #2176
Tech Apprentice
Join Date: Aug 2002
Posts: 61

hi kiyano,

Thank you for the links. Are 12th still popular in Japan?

Have you ever use HPI foam tyre for 12th? I'd like to know how it compare to other.

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Old 01-09-2003, 08:50 AM   #2177
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Location: Tokyo,Japan
Posts: 151

>Thank you for the links. Are 12th still
>popular in Japan?

It is not excessive popular. In Japan the TC Car popular is category. For example when it compares with all the Japanese championships of 2002, there were 360 participants in TC class. 1/12 classes were 150. As for all the Japanese championships participation is decided by the preliminary round result of two times which are executed in every area. But because in 1/12 classes the participants are few, there was an area which is not preliminary round. Therefore in 1/12 classes the completely beginner could participate. When in TC class it can unfold the preliminary round whose every area is extreme, forcing. And it is very few really to look at 1/12 with the local circuit of town

>Have you ever use HPI foam tyre for
>12th? I'd like to know how it compare
>to other.

Yes of course. But
The tire of the HPI as for the supply quantity it is little. In order for the JACO tire to have circulated many, it is thought. In Japan the YOKOMO has imported the JACO tire. The YOKOMO has done the tire of the original brand release, but as for that being used with big race i think it is little. The KYOSHO has imported the TRC tire. In Japan the KAWADA release has original tire, but the supply quantity is small. As for the Japanese user there is many a thing which utilizes the JACO and the TRC tire. With the HPI the "K rubber Hard" tire can use with carpet course. But it's supply quantity is small, the gray of the JACO and the TRC seems like main current
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Old 01-09-2003, 09:38 AM   #2178
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Kiyano> hi, can pls give me hobby shops located in kyoto if you know any with their address and maybe email and website if possible? possibly near kyoto university...thanks!
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Old 01-09-2003, 01:56 PM   #2179
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That car looks pretty sweet! How thick are the chassis on them, and do associated pod parts and t-bars fit?

Also, are there any shops out there who carry them?

Pete Simons
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Old 01-09-2003, 04:41 PM   #2180
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Thumbs up Speedmerchant REV 3

Do any of you REV 3 owners still have a copy of your instructions that you could E-mail or fax to me.
I have tried Speedmerchant and he never responds to his E-mails or messages.
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Old 01-09-2003, 06:05 PM   #2181
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How can I see that tech site in English (I am a stupid American)
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Old 01-09-2003, 07:34 PM   #2182
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Has anyone tried another method of securing the batteries in their 12L3 other than strapping tape? I recently got back into 1/12th and taping the batteries in each heat never used to be that painful. I admit it was quite a few years ago but there must be an easier way. Anyone? Would graphite battery straps work some how. Has anyone tried?


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Old 01-09-2003, 09:22 PM   #2183
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Smile Kyoto shop


I am not recognized being not to be detailed in Kyoto, whether or not it is close to the Kyoto university, well. Being to be several shops, please try communicating.



Use free translation service such as altavista to see japanese page.

kiyano http://www.kimihiko-yano.net/

Last edited by kiyano; 01-09-2003 at 09:26 PM.
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Old 01-09-2003, 09:57 PM   #2184
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Default tech car


>How thick are the chassis on them

It is approximately 2.1mm . There is also an option hard chassis.

>and do associated pod parts and t-bars fit?
I have no tech car, it is not understood. Perhaps I think the fit it does. Is not the rear pod, but as for the front end of the tech it could use in the RC12L3.

>Also, are there any shops out there who carry them?

Sorry, I do not know the store which handles the tech car in America.

Use free translation service such as altavista to see japanese pages.
Translation does not do perfectly. But it is not the case that it cannot be read completely

kiyano http://www.kimihiko-yano.net/
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Old 01-10-2003, 05:32 AM   #2185
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Fiddle Faddle - I don't have any instructions, but I am willing to help you. Send me a private email with your questions and I will respond. Or, if you want all to see the questions and answers, I will reply to your questions on this thread.
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Old 01-10-2003, 07:15 AM   #2186
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Default Re: Speedmerchant REV 3

I don't have my instructions anymore, but I sold my Rev3 to a buddy and he should still have them. I'll try to get him over here in the next day or so, and if he still has the instructions I'll scan them and get them to you.


Originally posted by Fiddle Fadel
Do any of you REV 3 owners still have a copy of your instructions that you could E-mail or fax to me.
I have tried Speedmerchant and he never responds to his E-mails or messages.
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Old 01-10-2003, 11:53 AM   #2187
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Send a message via AIM to stormperson

if you have any questions about a rev. 3, please feel free to ask on this thread. or PM davidL, he knows a few things about em,
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Old 01-10-2003, 12:23 PM   #2188
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you can download a Carpet Knife manual from their site, they are very simular cars

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Old 01-12-2003, 06:42 PM   #2189
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I'm planning on getting a Associated 12L3 to race on a carpet track. I was wondering what is a good cheap servo to put in it. I was looking for something with a transit time around .10, with ok torque. I'll be racing 1/12 stock, maybe 1/12 mod every once in a while. What are some good starting tires as well. Thanks.

-Sushi Boy
Seido Speed Works - Apex RC - Prospec America - RC Mission America - LRP - Protoform - AVID - 1Up Racing - Xenon - Xpert - Sanwa - SpeedZombi - Slapmaster Tools - Turtlemaster Racing - Seattle RC Racers
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Old 01-12-2003, 07:16 PM   #2190
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There's not really any cheap 1/12 servos. I found this out the hard way. I went from a Hitec 225 to a Airtronics 94145Z and the difference was unbeleivable. The centering and quickness of the 94145 made a huge diff. Another good one is the JR 3550. There are both around $60. Tires should be Jaco purple front, grey rear, and must be cut down or the car will handle like crap. .075 t-bar and .022/.024 front springs.
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