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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.

KITS:
Click links to go to manufacturer product page. If any are missing please add them!

TIRES:
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!

THIS MAY NEED UPDATING FOR THE NEW BLACK CRC CARPET

Brands:
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:
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:
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.

Examples:
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:
BSR/CRC/Jaco



Contact



Corally



JFT (Japan Foam Tire)



Ulti



Enneti (Xceed)



ELECTRONICS:
ESC:
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 decide to use an Rx pack, MAKE SURE TO REMOVE THE RED WIRE FROM THE ESC PLUG THAT GOES INTO THE RECEIVER!!!

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.

1S ESC:
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!
Servos:
BODIES:
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


PROTOForm:

Reflex Racing/RSD:

SUSPENSION ADJUSTMENTS:

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Old 09-18-2008, 04:32 AM   #29356
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Quick question what does everyone use the measure the toe on their 12th scale?
Despite being $80... the niftech tool can't be beat.
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Old 09-18-2008, 05:10 AM   #29357
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Ok could'nt find a pic so this will have to do, no laughing at the artwork
You've mounted the flap wrong. It should look like this...
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Old 09-18-2008, 05:02 PM   #29358
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You've mounted the flap wrong. It should look like this...
ahhh that's what I was thinking when I mentioned the "wicker bill" earlier...that's what makes it a "Gurney flap" as opposed to an air deflector.

Is it possible to use a 32T pinion with the stock 100T spur on the 12L4? The manual actually recommends a 34T pinion (for stock motors) but I don't see how it will fit...I can't get the motor far enough forward to fit even a 32 without hitting the t-bar and it is maddening! I have been involved in RC since 1987 and have done it all: boats, planes, offroad and onroad, nitro and electric from 1/36 to 1/8 buggy...but this 12L4 is my first 1/12 scale and it is like reading a newspaper in a high wind!! Should I even run the 100T spur at all or chuck it from the start? 19T brushed, asphalt, 160' x 90' layout with one of the 160' sides being all straightaway, Jaco premount tires.

thanks

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Old 09-18-2008, 05:11 PM   #29359
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I would look for an 88 or 96 kimbrough spur if they're easily available near you. You'll have an easier time gearing for brushed motors with those spurs.
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Old 09-18-2008, 06:22 PM   #29360
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Originally Posted by flatspunout View Post
ahhh that's what I was thinking when I mentioned the "wicker bill" earlier...that's what makes it a "Gurney flap" as opposed to an air deflector.

Is it possible to use a 32T pinion with the stock 100T spur on the 12L4? The manual actually recommends a 34T pinion (for stock motors) but I don't see how it will fit...I can't get the motor far enough forward to fit even a 32 without hitting the t-bar and it is maddening! I have been involved in RC since 1987 and have done it all: boats, planes, offroad and onroad, nitro and electric from 1/36 to 1/8 buggy...but this 12L4 is my first 1/12 scale and it is like reading a newspaper in a high wind!! Should I even run the 100T spur at all or chuck it from the start? 19T brushed, asphalt, 160' x 90' layout with one of the 160' sides being all straightaway, Jaco premount tires.

thanks

-rocky b
I love it!! Like reading a newspaper in a high wind.

1/12th scale can feel like that sometimes. Start thinking in terms of roll out when deciding your gearing. Not all 19T brushed motors are alike but you should start off someplace between 46 and 50 mm on the roll out. And you may have to drop down to at least a 96 spur. Maybe more.
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Old 09-18-2008, 06:32 PM   #29361
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12" calipers. measure the back then the front. You have to get used to taking up the slack in the steering equally front to back
+1 for big calipers. i never leave home without them. i picked mine up on amazon.com
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Old 09-18-2008, 06:54 PM   #29362
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yeah and i seen his calipers. they are huge.
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Old 09-19-2008, 10:53 PM   #29363
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looking to get a 1/12 scale but can't decide between BMI or Associated which do you all perfer?




thanks
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Old 09-19-2008, 11:01 PM   #29364
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The new Associated car (12R5...I wouldn't even consider one of the earlier cars unless it was damn cheap and budget was my 100% concern) appears to be a very good value and reasonably high quality. The BMI is INCREDIBLE quality, genuinely innovative product(s) (the guy who designs and manufactures them is a real 1/12 guy), unmatched customer support (Jason is online pretty much everyday and only a phone call or e-mail away to answer questions, etc). PLUS you support a 100% Made in America company when you buy BMI, not just another "we'll produce 'em in China so we can sell 'em cheaper" product.

Plus the BMI is every bit as good as you've heard. I've only heard mixed reviews on build quality and handling of the new Associated car and haven't had a chance to drive one myself. I have purchased and run two DB12R's and haven't been disappointed since making the change. Tweak-free and feels like it drives itself.

fwiw,

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Old 09-19-2008, 11:04 PM   #29365
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Originally Posted by RCSteve93 View Post
Despite being $80... the niftech tool can't be beat.
$80???!!! They sell all day every day direct from Niftech for $25.

And yes--they work VERY well once you get the hang of 'em. Every car I build and set with them runs dead straight from the outset without touching trim. Then again, I'm amazing.
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Old 09-19-2008, 11:05 PM   #29366
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+1 for big calipers. i never leave home without them. i picked mine up on amazon.com
Doesn't matter. OD's is bigger
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Old 09-20-2008, 12:40 AM   #29367
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Doesn't matter. OD's is bigger
Oh stop!
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Old 09-20-2008, 05:21 AM   #29368
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looking to get a 1/12 scale but can't decide between BMI or Associated which do you all perfer
I'd recommend you goto your local track for a race day and see what the fast guys are running and what parts are in stock. you might also find a good used car deal. Speed Merchant or CRC cars did very well at IIC vegas 08 winning 1/12 stock and mod classes.
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Old 09-20-2008, 07:58 AM   #29369
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...of course MY caliper measures in the non-real number set... The conversion is kind of a pain in the a$$ but no one will steal it. Hell, no one wants to BORROW it.

I set my width, ride height, etc in multiples of pi so it all works out. I get strange looks from people when I tell 'em my car is 54.7 wide or 1.43 ride height, but chances are they were looking strangely at me already when I was humming the theme to Numb3rs while I was truing my tires to 14.3 so screw 'em.
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Old 09-20-2008, 01:17 PM   #29370
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Originally Posted by Scottrik View Post
...of course MY caliper measures in the non-real number set... The conversion is kind of a pain in the a$$ but no one will steal it. Hell, no one wants to BORROW it.

I set my width, ride height, etc in multiples of pi so it all works out. I get strange looks from people when I tell 'em my car is 54.7 wide or 1.43 ride height, but chances are they were looking strangely at me already when I was humming the theme to Numb3rs while I was truing my tires to 3 so screw 'em.
When I first bought my Big Calipers I thought I would just use them for measuring rear track, but they have turned out to be so handy for a variety of things everyone borrows them and I'm always having to track them down.

I think I'll follow your lead and convert them to measure in pie. The only question now is Cherry or Apple
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