R/C Tech Forums

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

    Hide Wikipost
Old 10-21-2016, 07:14 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 plugsinto 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 11-01-2006, 05:36 PM   #21631
Tech Champion
rayhuang's Avatar
Join Date: Dec 2001
Location: Cleveland Heights, Ohio
Posts: 6,511
Trader Rating: 5 (100%+)
Send a message via AIM to rayhuang

Originally Posted by wallstreet
ray did you run the geration x crc car ? and what does the hd stand for heavy duty ?

I did not-I havent even driven one yet. I have to say my standard 3.2r was quite fantastic though. I couldnt have been more pleased with it (except the one run I changed motors, brushes and changed front tires and all were little backwards moves!!).

I will be returning the 3.2 to Sydor and buying the GenX as soon as it comes out. and I mean the day it comes available to us mere mortals!!

rayhuang is offline   Reply With Quote
Old 11-01-2006, 05:47 PM   #21632
Tech Master
smyka's Avatar
Join Date: Dec 2003
Location: Broad Brook,CT
Posts: 1,182
Send a message via AIM to smyka

blackstock and cuffs started runnning for crc when trintiy became a distributer for crc stuff
Trinity, Proline ,EA motorsports, T.O.P Racing ,Futaba ,Bsr Racing tires ,Advantage racing products,Hot Bodies racing,Tq Wire ,REDS Racing, Orca ,Protoform racing
smyka is offline   Reply With Quote
Old 11-01-2006, 05:53 PM   #21633
Tech Fanatic
RobS's Avatar
Join Date: Jul 2004
Location: Chatham, Ontario
Posts: 799

So does this mean Trinity has discontinued their 12th scale? I don't see it listed on their site anymore...
Rob Say
Action Hobbies Kingsville
"In racing you never really lose. You either win, or learn."
RobS is offline   Reply With Quote
Old 11-01-2006, 05:56 PM   #21634
Tech Champion
rayhuang's Avatar
Join Date: Dec 2001
Location: Cleveland Heights, Ohio
Posts: 6,511
Trader Rating: 5 (100%+)
Send a message via AIM to rayhuang

Originally Posted by RobS
Blackstock running a CRC car? What happened to Trinity?

From the pics the new car looks awesome. I've been debating on whether to replace my current 12th scale and have to say I was leaning towards the Rev 4.5, but now that CRC has finally announced the new car is coming, I think I've made my descision...

As with the new Parma body and the Gen x it could be said that the devil is in the details. Theres no cross brace so motor wires can be run under the damper tubes without bindng the pod. The 0-ring attachment for the batteries is more secure, the rear pod is super low profile, its narrow and the the side spriing area is very stiff for rock solid tweak setting and handling. And this doesnt even touch on the new front suspension and some other changes related to handling.
rayhuang is offline   Reply With Quote
Old 11-01-2006, 07:51 PM   #21635
Tech Addict
Join Date: Feb 2002
Location: Kansas City
Posts: 577

What happened to your sig- you get in trouble??
BSYDOR is offline   Reply With Quote
Old 11-02-2006, 03:14 AM   #21636
Tech Lord
protc3's Avatar
Join Date: Jun 2003
Location: Spring Hill,Florida
Posts: 10,812
Trader Rating: 13 (100%+)

dont worry billy,i got to see it.that was funny as hell
Jason Breiner
BMI Racing
Team Associated
J Concepts
protc3 is offline   Reply With Quote
Old 11-02-2006, 04:07 AM   #21637
Tech Initiate
psychosilence's Avatar
Join Date: Apr 2006
Posts: 38

Running 1/12th mod this weekend on asphalt. Around 20m straight, infield not tight. Plan on running a 8x3 or 9x2.

Can anyone please suggest a rollout and timing for the motor using 4200 cells with around 650sec runtime at 20A.

psychosilence is offline   Reply With Quote
Old 11-02-2006, 05:07 AM   #21638
Tech Regular
rpoage's Avatar
Join Date: Dec 2002
Location: Ct Penn. USA
Posts: 277
Trader Rating: 2 (100%+)

Originally Posted by Grenade10
Slampmaster6000 - I built my rear diff last night using your kit that I got from Robert at Ashford Hobbies.

All I can say is WOW!!

I've been racing 1/12 scale since the mid 80's, this little item would have saved me weeks worth of time working over diffs.
Thanks for the good press but I have to make a correction. We are Ashford Hobby. www.ashfordhobby.com

Ashford Hobbies is currently owned by a URL holding company that is not related to us. Legal action to follow.

Thanks again for the support.

Last edited by rpoage; 11-02-2006 at 06:32 AM.
rpoage is offline   Reply With Quote
Old 11-02-2006, 06:28 AM   #21639
Tech Elite
Join Date: Oct 2002
Location: Mclean, VA
Posts: 3,940
Trader Rating: 45 (100%+)
Default 1:12 Stock Tires...

What tire combo's have you been using for medium and high-bite carpet tracks for 1:12 Stock? Will Purple fronts and Grey rears still do the job?
Apex is offline   Reply With Quote
Old 11-02-2006, 06:30 AM   #21640
Tech Master
1fastdude's Avatar
Join Date: Apr 2002
Location: Sinsinnati
Posts: 1,918
Trader Rating: 15 (100%+)

Purple or blacks seem to work well in high bite situations.
Team Horizon-Team Spektrum-Tekno-Kyosho*B-FAST R/C Performance*TQ Racing Wire Products-TNT-FX.COM-Avid RC-Dynamite-*AKA*92Zero Design*
1fastdude is offline   Reply With Quote
Old 11-02-2006, 07:44 AM   #21641
Tech Elite
Join Date: Oct 2002
Location: Mclean, VA
Posts: 3,940
Trader Rating: 45 (100%+)

Originally Posted by 1fastdude
Purple or blacks seem to work well in high bite situations.
Are you referring to the CRC tires?

What about for Jaco and Parma?
Apex is offline   Reply With Quote
Old 11-02-2006, 08:12 AM   #21642
Tech Elite
vtl1180ny's Avatar
R/C Tech Charter Subscriber
Join Date: Sep 2003
Location: Wrong Island
Posts: 4,961

Anyone using the 13.5? What kind of rollout is a good starting point???
I still lurk....
vtl1180ny is offline   Reply With Quote
Old 11-02-2006, 08:38 AM   #21643
Tech Regular
Join Date: Feb 2002
Location: MI
Posts: 462

For the 13.5 you can start at 2.10 and work your way up above 2.30. A 92 tooth spur will help you fit the gear on the car.

You can gear it up until it stops going faster on the straight. Won't get all that hot regardless of what gear that you run.
Unregistered is offline   Reply With Quote
Old 11-02-2006, 09:21 AM   #21644
Tech Regular
Pat Clark's Avatar
Join Date: Aug 2005
Location: Easton, Pa
Posts: 297

Originally Posted by RobS
So does this mean Trinity has discontinued their 12th scale? I don't see it listed on their site anymore...

Looks to be that way....
Associated, Reedy, Tekin, Tq Wire, Protoform, Veytrec Design Lab
Pat Clark is offline   Reply With Quote
Old 11-02-2006, 11:46 AM   #21645
Tech Champion
rayhuang's Avatar
Join Date: Dec 2001
Location: Cleveland Heights, Ohio
Posts: 6,511
Trader Rating: 5 (100%+)
Send a message via AIM to rayhuang

More pics for you to compare:

Speed 8 vs Speed 8HD
Attached Thumbnails
1/12 forum-spd8spd8hd.jpg   1/12 forum-spd8spd8hd2.jpg  
rayhuang 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 07:14 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