R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

    Hide Wikipost
Old 10-21-2016, 07:18 PM   -   Wikipost
R/C Tech Forums Thread Wiki: 1/12 forum
Please read: This is a community-maintained wiki post containing the most important information from this thread. You may edit the Wiki once you have been a member for 90 days and have made 90 posts.
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!


Print Wikipost

Thread Tools Search this Thread
Old 09-06-2008, 10:33 AM   #29236
Tech Champion
hanulec's Avatar
R/C Tech Elite Subscriber
Join Date: Sep 2007
Location: @ the post office
Posts: 7,928
Trader Rating: 23 (100%+)

Ophidian - the bmi web page has that info for jacos.
FJ / ROAR #2-122945 / Shop@ Awesomatix USA / Wild Turbo Fan / Mon-Tech Racing / RocheRC USA / Side Piece /
LRP / John's BSR Tires / TeamEAM / TQ Wire / R1 / Team Scream / PCR
RacerLog wiki Awesomatix A700 / 2wd offroad 4 life
hanulec is offline   Reply With Quote
Old 09-06-2008, 12:04 PM   #29237
Tech Fanatic
Join Date: Apr 2003
Location: Calgary, Alberta
Posts: 755
Trader Rating: 2 (100%+)

Prefect thanks for the info.
Shawn Plume
Frantic Racing (Est. 1988)
Ophidian is offline   Reply With Quote
Old 09-06-2008, 12:27 PM   #29238
Tech Regular
Crashmaster's Avatar
Join Date: Jan 2004
Location: Lincs, England
Posts: 363

Quick question for you all guys,

Just getting into 12th, and have all of the TC electrics, including a Nosram Matric TC ESC. Now I know this will not fit in the car with the fan attached, but if I am to remove the fan, will the ESC fit and clear the shell?? (obviously prefer not to have to buy a new ESC!)

Thanks for the help,
Crashmaster is offline   Reply With Quote
Old 09-06-2008, 09:22 PM   #29239
Tech Elite
andrewdoherty's Avatar
Join Date: Jan 2005
Location: ★Wylie, TX★
Posts: 3,763
Trader Rating: 47 (100%+)

The nosram is the same as the LRP spher comp TC, right? If so it depends on what you mean by"fit" . . . It would be possible to raise the body enough to get the esc under there, but the heatsink wont allow the body to sit as low as most racers prefer.
"Whether you think you can, or think you can't, you're right." -Henry Ford
"[Driving] Genius is 1% inspiration, and 99% perspiration" -T.A. Edison
|◤ReflexRacing.net◢|◤Gravity R/C◢|◤HWNA◢|◤AVID R/C◢|
andrewdoherty is offline   Reply With Quote
Old 09-06-2008, 09:35 PM   #29240
Tech Master
TFR's Avatar
Join Date: Aug 2001
Location: Toronto
Posts: 1,767
Trader Rating: 11 (100%+)

Muchmore l AHRP l Xenon l Futaba
TFR is offline   Reply With Quote
Old 09-06-2008, 09:38 PM   #29241
Tech Champion
Join Date: Nov 2001
Location: Hawaii, USA
Posts: 7,154

nice looking car...too bad it's not legal under most sanctioning bodies.
InspGadgt is offline   Reply With Quote
Old 09-07-2008, 01:00 AM   #29242
Tech Regular
Crashmaster's Avatar
Join Date: Jan 2004
Location: Lincs, England
Posts: 363

Originally Posted by andrewdoherty View Post
The nosram is the same as the LRP spher comp TC, right? If so it depends on what you mean by"fit" . . . It would be possible to raise the body enough to get the esc under there, but the heatsink wont allow the body to sit as low as most racers prefer.

Yeah it is the same as the Sphere TC. Probably have to look at getting another ESC for the 12th
Crashmaster is offline   Reply With Quote
Old 09-07-2008, 03:48 AM   #29243
Tech Fanatic
Join Date: Jan 2005
Location: victoria BC
Posts: 810
Trader Rating: 5 (100%+)

Originally Posted by Ophidian View Post
I just need a little help. Whats the normal roll out for 17.5, 13.5 and 10.5 BL motor on a medium carpet track? Just so I have a starting point. And what are the current shore ratings on 12th tires. I listed the tires below. It's been a few years since I last raced and all my notes for tires on my local track is by shore ratings and my motor notes are for brushed motors.


Double Pink
Hey there I've racing in Calagry before.

that if Carcar is still only allowing niftech.(which sucks for 12 scale doesn't last the 8minutes)
if your running 17.5 go with yelllow rear or dpink or lilac
I ran when I was there grey puple in stock and white purple for mod(ran a 19 turn and came in 3 in the b just missed the A.

I prefer yellow lilac for our track but for your track which is low to medium traction I'd go with yello and dpink.

for your lower winds I'd go with grey and purlple to start. I need extra traction when I was ther for the wcics series in mod, and ran white rears they do wear fast though. adn purple as that all I brought with me. I would of gone with DPink.

I hope this helps. If you need any more help contac Dwayne he know 12 scale and is fast.
cyrrus is offline   Reply With Quote
Old 09-07-2008, 06:53 AM   #29244
Tech Apprentice
R/C Tech Elite Subscriber
Join Date: Apr 2006
Location: Poland Warsaw
Posts: 71

Originally Posted by TFR View Post
Nice car, its a pity i would not be allowed at any race. ( not roar or efra event)

But the rear suspension looks realy nice.

About the Nosram esc , you can remove the fan , and cut heatink. but then you wont be able to use it with tc. If you use Parma speed 8 it would fit with the heatsink, this body is quite high, or can be cut lower whit only smal loose of front downforce.
blazeblazucki is offline   Reply With Quote
Old 09-07-2008, 07:25 AM   #29245
Tech Regular
Join Date: Jul 2007
Location: Victoria B.C Canada
Posts: 387
Trader Rating: 11 (100%+)

Originally Posted by hanulec View Post
I've primarily been running 17.5T 1/12th. I'd recommend starting at a 84mm rollout. The gearing will depending on motor model, esc model and track layout.
What spur & pinon & wheel size were you using to get this roll out?
light is offline   Reply With Quote
Old 09-07-2008, 02:57 PM   #29246
Tech Champion
Join Date: Nov 2001
Location: Hawaii, USA
Posts: 7,154

Originally Posted by light View Post
What spur & pinon & wheel size were you using to get this roll out?
That would depend on the diameter of the tire. Different size tires will require different size spurs and pinions to keep the same roll out.
InspGadgt is offline   Reply With Quote
Old 09-07-2008, 03:13 PM   #29247
Tech Master
Join Date: Jun 2003
Location: Tulsa, Oklahoma
Posts: 1,859
Trader Rating: 40 (100%+)
Send a message via AIM to brians11

Hey guys, I decided to sell my Corally SP12x WC car. Here is the link to the F/S thread
Corally SP12x WC kit
brians11 is offline   Reply With Quote
Old 09-07-2008, 03:31 PM   #29248
Regional Moderator
CarbonJoe's Avatar
Join Date: Jul 2006
Posts: 2,660

Originally Posted by light View Post
What spur & pinon & wheel size were you using to get this roll out?
I posted an Excel spreadsheet in the BMI DB12R thread that allows you to easily find your rollout.

See this post: http://www.rctech.net/forum/4792583-post5349.html

That said, the motor, ESC, etc. have nothing to do with calculating rollout. All rollout is the amount the car moves forward (rear tires roll) for one revolution of the motor shaft. Thus, it only takes into account gear ratio and tire size (circumference). Since it is much easier to measure tire diameter with calipers, everyone uses that.

As for determining what is the correct rollout for a given track, it does matter what type of motor and ESC you are using. For example, we have found for our local track, whatever rollout people were using with a CO27 stock motor, using a 17.5 requires about 2x the rollout. Last season, guys were running around 1.80 inches with the CO27, now we are using a rollout around 3.60 inches. This was done empirically, going by laptimes and motor temperature. Gear up until the laptimes aren't getting any faster or the temp gets above the safe temp for your motor, then drop back one tooth on the pinion so you don't thermal.
*** The Gate - Celebrating 7 years at the same location ***
The difference between genius and stupidity is that genius has its limits. - Albert Einstein
Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car
CarbonJoe is offline   Reply With Quote
Old 09-07-2008, 05:02 PM   #29249
Tech Adept
noline's Avatar
Join Date: Sep 2001
Posts: 227

Hey guy's I have a gearing question Im racing on a 50 X 25 carpet track with a 1.75 rear tire how should i gear a 17.5
noline is offline   Reply With Quote
Old 09-08-2008, 01:20 AM   #29250
Tech Elite
odpurple's Avatar
Join Date: Dec 2002
Location: San Francisco
Posts: 2,187

Originally Posted by TFR View Post
Sometimes something is so cool it doesn't matter if its legal or not. That is one interesting car right there! More pics please!
TOP Racing USA--OD Racing--Novak--Power Push--J Spec
odpurple is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
New to the forum mig rod Electric Off-Road 1 01-05-2008 04:23 PM
hi i need help and im new to the forum racer4 Rookie Zone 4 01-21-2007 01:37 PM
Why is this forum listed under the On Road Forum? sport10 Onroad Nitro Engine Zone 0 01-11-2007 07:06 AM
Forum Changes... futureal Wisconsin & Illinois Racing 3 10-28-2002 08:26 PM

Currently Active Users Viewing This Thread: 2 (1 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off

All times are GMT -7. It is currently 01:13 PM.

Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net

SEO by vBSEO 3.5.0