R/C Tech Forums

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

    Hide Wikipost
Old 10-28-2016, 12:43 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!
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:


Print Wikipost

Like Tree47Likes
Thread Tools Search this Thread
Old 11-19-2004, 07:36 PM   #9271
Tech Fanatic
Join Date: Jan 2003
Location: Cedar Rapids, Iowa
Posts: 894
Trader Rating: 17 (100%+)

Originally posted by Tim Stamper
It is one of the flexiest chassis that I have ever felt, but it doesn't seem to change the handling much since it is so narrow and it doesn't twist as much as a wider chassis.

I disagree! Just as an example the 12L3, Yokomo YRX and the Rev3 (probably more out there, but I just haven't drove them)were more flexible than this car. It is more flexible than some of the newer cars though.
429racer is offline   Reply With Quote
Old 11-19-2004, 09:37 PM   #9272
Tech Master
PizzaDude's Avatar
Join Date: Nov 2002
Location: Parts Unkown
Posts: 1,041

Originally posted by PizzaDude
Guys how good are the Jaco Aqua rear tires?
How is their traction?
On carpet?
On asfalt/tarmac?
does anyone run these tires?
PizzaDude is offline   Reply With Quote
Old 11-19-2004, 11:09 PM   #9273
Tech Champion
Still Bill's Avatar
Join Date: Jan 2004
Location: Reno, NV
Posts: 7,167
Trader Rating: 12 (100%+)
Default IRS Big Diff

I am currently running the standard diff setup in my 12L3. Should I be running a IRS big diff setup for stock 1/12th carpet racing at Stockton?
Constantly evolving CRC WGT and WGT-R/T...Carpet & Asphalt...All thanks to Team CRC.
Still Bill is offline   Reply With Quote
Old 11-19-2004, 11:32 PM   #9274
Tech Elite
odpurple's Avatar
Join Date: Dec 2002
Location: San Francisco
Posts: 2,192

A big ring diff is far better than the stealth diff. If you use the right kind of spur gear you can build a diff using 12 balls which will be a lot smoother and last a lot longer than the 6 ball small diff. The only disadvantage to a big ring diff is a little more weight. Theoretically, the small diff should be faster, but I don't think it's enough to outweigh the hassle of rebuilding it every heat. Since you are running at Stockton, just ask Ruben, Ashby or me to show you the difference.

BTW- the IRS diff is good, but if you want the best buy Niftech.

Last edited by odpurple; 11-19-2004 at 11:40 PM.
odpurple is offline   Reply With Quote
Old 11-20-2004, 10:33 AM   #9275
Tech Initiate
Join Date: Oct 2004
Posts: 33
Default Parma Tires???

What is the difference between the Parma Gray rear tires, and the Parma Pink rear tires. The both have a shore rating of 30.

Can someone please help me out? Thanks.
CarpetRacer is offline   Reply With Quote
Old 11-20-2004, 10:40 AM   #9276
Tech Elite
odpurple's Avatar
Join Date: Dec 2002
Location: San Francisco
Posts: 2,192

The pinks have more bite than the grays. At our track most guys run grays for stock and whites or pinks for modified.
odpurple is offline   Reply With Quote
Old 11-20-2004, 11:52 AM   #9277
Tech Initiate
Join Date: Oct 2004
Posts: 33

CarpetRacer is offline   Reply With Quote
Old 11-20-2004, 03:19 PM   #9278
Tech Addict
RacinJ's Avatar
Join Date: Apr 2004
Location: Mesa Az
Posts: 735
Post 1/12th scale in Arizona?

I'm trying to find out if there is active 1/12th scale racing in the Phoenix Az area. Carpet preferred.
RacinJ is offline   Reply With Quote
Old 11-20-2004, 06:15 PM   #9279
Tech Regular
Join Date: Aug 2004
Location: SCS Michigan
Posts: 332

what camber should i start with on carpet on my C12?
Tony Szep is offline   Reply With Quote
Old 11-20-2004, 07:02 PM   #9280
Tech Initiate
Join Date: Oct 2004
Location: Palmdale, CA
Posts: 36
Default XRAY T1M

This is probably a stupid question but I don't see any talk of the XRAY T1M on this thread. Is it not legal for 1/12 racing?

I am interested in a 1/12 pavement car (no carpet) and would prefer a 4wd car. Are only 2wd cars used to race 1/12?

slawsonb is offline   Reply With Quote
Old 11-20-2004, 07:18 PM   #9281
Tech Elite
odpurple's Avatar
Join Date: Dec 2002
Location: San Francisco
Posts: 2,192
Default not legal

Just because the T1M is 1/12th scale doesn't mean it's legal for racing. If you are talking ROAR of IFMAR, then only straight rear axles are allowed. I don't think any national or international sanctioning body has a class for cars like the Yokomo Mini, T1M or the Corally 1/12th touring car chassis. At the club level some tracks may allow mixing these two classes, but the 4 wheel drive car wouldn't stand a chance against conventional 1/12th cars unless there was no traction at all.
odpurple is offline   Reply With Quote
Old 11-20-2004, 07:20 PM   #9282
Tech Addict
Tim Stamper's Avatar
Join Date: Nov 2003
Location: Redford, Mi.
Posts: 591

Originally posted by Tony Szep
what camber should i start with on carpet on my C12?


If you're gonna be at Larry's, run 1.5 degrees. If you are at the RcScrewz track, run 1 degree. If you are at Halo, I had good luck with 2 degrees. When you set the camber, only give about a quarter of a turn of pre-load on the flex plate adjustment screw after it touches the arm. I also run the screw in the outer hole on the plate for stock and in the middle for mod.

This space for rent
Tim Stamper is offline   Reply With Quote
Old 11-20-2004, 07:36 PM   #9283
Tech Regular
Join Date: Nov 2004
Location: Ottawa, Canada
Posts: 289

Hey all! I just wanted to ask what is the easiest way to fix traction roll problem. I have an RC12L4 and running blue spring with stock setup pretty much. I have thick t-bar. Jaco purple, grey combo. However at high speeds I still traction roll. I am running 3mm ride height and really small diameter tires.

Any suggestions for goop on the pod or hingepins? Hope to figure it out soon
Michael Zufelt

It's not how you stand next to your car, it's how you race your car.

TheZoof is offline   Reply With Quote
Old 11-20-2004, 08:05 PM   #9284
Tech Regular
Join Date: Nov 2004
Location: Ottawa, Canada
Posts: 289

I want to ask another question while I am at it. I will be racing stock 1/12th at Cleveland for the first time in 12 years! I noticed quite a few people commenting on lowering the "pod" for the 12L4??? Is this referring to the holes for bearing holders go in arn't low enough? Anyways my question is if I want to purchase the "upgrade pod" What part numbers from CRC do I look for? I know that CRC will have a booth so I am sure I will be able to purchase them if I feel I need it.

What size tires for stock carpet do you guys run? I am running 46mm(about 1.7" i think) with just over 3mm rideheight(which I think is legal limit for Cleveland?)

Thanks, Mike
Michael Zufelt

It's not how you stand next to your car, it's how you race your car.

TheZoof is offline   Reply With Quote
Old 11-20-2004, 08:08 PM   #9285
Tech Addict
Join Date: Nov 2003
Location: Ridin my Harley
Posts: 707
Trader Rating: 3 (100%+)
Send a message via AIM to Adam Hartzell

Zoof--The CRC booth should be able to help you when you get there. I usually start my rear tires at 1.9 for stock and 1.85 for mod.
Adam Hartzell 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: 1 (0 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 11:10 PM.

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