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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 04-25-2003, 12:06 PM   #2836
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Trust me, I brush the boards enough.

Pushing yourself to go faster is what makes it fun, if you don't racing gets boring. The only kind of boring I would like to experience would be winning every race but I think I'm pretty safe there.

Your "engineering" approach is pretty much what I do, too; but if I ever smoke you I will gladly give you all the credit...
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Old 04-26-2003, 03:43 PM   #2837
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Originally posted by davidl
odpurple - I am going to add some more to this, and it actually applies to almost everyone. Analyze where you are loosing ground to the dude that wins all the time. That should tell you what to do next. If you are dumping, but running similar lap times to Mr. Fast, you need to change your motor, gear, batteries, brushes, timing and stuff like that. You may also need to free your car up to save batteries. If you are loosing ground off the corner in the tight sections, but have a good line and are pulling the throttle, you need more motor or more forward bite in the car. If you are getting smoked on the straight, you need more gear. Those are the kinds of questions you should use in the evaluation. That will guide you to the solution. Sort of an engineering approach, but it works. But there are 3 major things that can be analyzed to go faster. They are 1) the driver, 2) the car, and 3) the motor/batteries/gear. Good luck and don't smoke me too badly if we race some day.

i agree with you 100%... sometimes, it's just easier said than done...
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Old 04-26-2003, 09:04 PM   #2838
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Yes highwayman, it has taken me over 15 years to get where I am. I wish I could see your Avtar close up.
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Old 04-27-2003, 05:51 PM   #2839
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Hey all.....long time no see........Hows everybodys racing been?????? After a brief hiatus...its time to pull out the old transmitter.......later
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Old 04-27-2003, 06:28 PM   #2840
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Hi guys

Has anyone tried to play around with 4 cell brushless setups? i have seen a couple of guys try them over here in Aus, first with a Hacker 6 turn and a comp speedie, was very good, although it would not take off from a standstill well, hesitated a lot and sometimes needed a little nudge to move. so all in all not effective to run. Last weekend a mate ran a novak system in his car, had good power, was extremely smooth, and ran for 19 minutes on 3000's on a big fast track. Am waiting this weekend to see how it will stand up in competition, but things are looking good.

Currently i run a hacker 6 turn brushless in Open Tourers, asnd having a brushless for 12th would be great, i think it is time to leave the lathe and the soldering station at home
12th Scale - The premier class (if you can make runtime)
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Old 04-27-2003, 11:15 PM   #2841
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Originally posted by davidl
Yes highwayman, it has taken me over 15 years to get where I am. I wish I could see your Avtar close up.
sent you an email...

practice makes perfect, and believe me, i know... it just seems that as you get better, its gettin harder and harder to improve, and while you're at it... the other guys are also improving...
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Old 04-30-2003, 07:53 AM   #2842
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I now have an ultra cool target rollout chart ...it'll tell you what pinion to use to keep the same rollout as your tires diameter decreases, click on the link in my signature (the gear ratio calculator), and select "target rollouot" in the input form.
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Old 04-30-2003, 11:04 AM   #2843
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Hi all,
is there anyone here who lives and races on The Channel Islands? Namely Jersey?
Just wondering because i am visiting there in a few weeks time and wanted to know if there were any good model shops there.
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Old 04-30-2003, 11:19 AM   #2844
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I'm the only channel islander I've seen on RC Tech, but from Guernsey (which is better than Jersey)

Jersey used to have a R/C club and raced several classes but because the Model Shop was so bad (among other factors) they closed down. I don't think there's a decent shop over there now, at least not for racing
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Old 04-30-2003, 11:38 AM   #2845
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Hi Louis,
thanks for the info.
I might get a chance to come to Guernsey as well.
Any shops there too?
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Old 04-30-2003, 11:54 AM   #2846
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There are 2, but not very good. Most people order from Apex b/c it's cheaper and the Model Shop owners are &%^*s ('tis true)
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Old 04-30-2003, 11:58 AM   #2847
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You could come and race or just watch depending on what class it is. Have a look on my profile for the site ^ and you can find out what race your visit may coincide with.
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Old 04-30-2003, 03:31 PM   #2848
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Just checked the fixtures, going to possibly be in Jersey 3rd june, might get over to Guernsey 4th june, so no races on those dates
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Old 04-30-2003, 04:32 PM   #2849
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Anyone using the Corally?
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Old 05-01-2003, 08:27 AM   #2850
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Black adder, Yes i run an SP12M.
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