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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 08-08-2014, 10:57 AM   #41086
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Originally Posted by LonnyJ1950 View Post
Yeah, I've seen that one already, it honestly isn't very helpful. I'll figure it out, no worries.
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Old 08-08-2014, 11:01 AM   #41087
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Originally Posted by metalnut View Post
Yeah, I've seen that one already, it honestly isn't very helpful. I'll figure it out, no worries.
If you have a question about it
posit it here, we can help

Would be nice if there was a proper 1/12 tire truing video or something
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Old 08-08-2014, 03:59 PM   #41088
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Hey guys. Where are y'all getting your 70-72T spurs from? I've be
en using PRS but I see their out. 1/8 ball spurs that is. (No CRC). I thought I read some about pro's low supply.
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Old 08-08-2014, 04:26 PM   #41089
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Originally Posted by BardSmith View Post
Hey guys. Where are y'all getting your 70-72T spurs from? I've be
en using PRS but I see their out. 1/8 ball spurs that is. (No CRC). I thought I read some about pro's low supply.
I couldn't find any so I went with 76T. I'd be down for some 70-72T as well,
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Old 08-08-2014, 04:27 PM   #41090
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Originally Posted by RedBullFiXX View Post
If you have a question about it
posit it here, we can help

Would be nice if there was a proper 1/12 tire truing video or something
Well, I get the theory, but as with most things in life, there are usually tricks to doing things that make them easier, more precise, less error prone, etc. I decided to try out 12th scale this coming carpet season, but this is the one aspect of the class I have not witnessed first hand. I'll let you guys know how badly I cut the first tire
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Old 08-08-2014, 04:43 PM   #41091
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Originally Posted by metalnut View Post
Well, I get the theory, but as with most things in life, there are usually tricks to doing things that make them easier, more precise, less error prone, etc. I decided to try out 12th scale this coming carpet season, but this is the one aspect of the class I have not witnessed first hand. I'll let you guys know how badly I cut the first tire
Try not to take off more than a few mm a cut

when you're finished they should look smooth
radius the edges a little
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Old 08-08-2014, 05:43 PM   #41092
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Quote:
Originally Posted by metalnut View Post
Well, I get the theory, but as with most things in life, there are usually tricks to doing things that make them easier, more precise, less error prone, etc. I decided to try out 12th scale this coming carpet season, but this is the one aspect of the class I have not witnessed first hand. I'll let you guys know how badly I cut the first tire
Quote:
Originally Posted by RedBullFiXX View Post
Try not to take off more than a few mm a cut

when you're finished they should look smooth
radius the edges a little
When I am prepping a batch of tires, I will get them all close to the final diameter I want. So, lets say I have 3 sets of new rear tire that are 45mm out of the box, and I'm prepping them for club racing, I want them all to be 43mm, I will first cut them all to 43.5mm in one pass,(taking off 0.75mm of rubber) with the feed set kinda fast. Then, the final cut will be at a slow feed and only take off the last 0.25mm of rubber(for 0.5mm less in diameter), this will give a nice smooth finish. Then radius the edges a bit, if racing on hi-traction surface, do a small radius, if low-traction, large radius.(you can use the radius to tune the car as well, especially the front). One other thing to keep in mind, after doing the big first cut on the tires, they will heat up, let them cool before doing the final cut. (rubber will expand and be softer when hot)

Also, get a good cutting bit for your truer, the Hudy one is good, as is the CRC, they are expensive, but they should last years.
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Old 08-08-2014, 06:15 PM   #41093
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Quote:
Originally Posted by BardSmith View Post
Hey guys. Where are y'all getting your 70-72T spurs from? I've be
en using PRS but I see their out. 1/8 ball spurs that is. (No CRC). I thought I read some about pro's low supply.
This where you can find 70-72 spurs with 1/8 balls
http://shop.awesomatixusa.com/rw-rac...spur-gear.html
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Old 08-08-2014, 07:06 PM   #41094
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I'm an off road guy thinking about getting back into 1/12 scale after a 20+ year break. I'll be running on carpet and looking to start off with a lightly used roller with some parts and tires. There seem to be several good options in the FS section but I'm trying to figure out a few things and any help is greatly appreciated.

-Tires- I've read alot about tire truing. Are these tires foam or rubber? How is tire wear on indoor carpet? Do you have to true every race?
-All 1/12 is 1 cell battery, correct?
-Are all brands of wheels compatible with all cars?
-How high maintenance is 1/12 compared to off road? Do they break easily?
-Most of the chassis look pretty much the same...
-Any beginner friendly tips appreciated or if you have the perfect lightly used setup for me, feel free to PM.

Thanks!
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Old 08-08-2014, 07:25 PM   #41095
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I dont know if this is allowed, but I just saw an AE RC12R5.2 on a certain internet auction site for a good price RTR. I was gonna bid but I decided to buy new so I could build it myself and familiarize myself with the car. Just put an R12R5.2 on layaway today. Actually researching electronics right now.
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Old 08-09-2014, 12:42 AM   #41096
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Quote:
Originally Posted by riverdog View Post
I'm an off road guy thinking about getting back into 1/12 scale after a 20+ year break. I'll be running on carpet and looking to start off with a lightly used roller with some parts and tires. There seem to be several good options in the FS section but I'm trying to figure out a few things and any help is greatly appreciated.

-Tires- I've read alot about tire truing. Are these tires foam or rubber? How is tire wear on indoor carpet? Do you have to true every race?
-All 1/12 is 1 cell battery, correct?
-Are all brands of wheels compatible with all cars?
-How high maintenance is 1/12 compared to off road? Do they break easily?
-Most of the chassis look pretty much the same...
-Any beginner friendly tips appreciated or if you have the perfect lightly used setup for me, feel free to PM.

Thanks!
!/12th tires are all foam. They are generally trued down from as sold size for performance reasons. They do not need to be trued between rounds, though some racers will smooth them up.
2S is raced in Japan, everywhere else it's 1 cell.
NO, all brands are not compatible with all cars, though most are interchangeable. Yokomo in particular uses a unique wheel.
Compared to offroad cars 1/12th is very low maintenance.
They look the same, but are all slightly different. Buy one that some of your local racers have so you can get help if you need it.
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Old 08-09-2014, 03:58 AM   #41097
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I agree completely!
Quote:
Originally Posted by LonnyJ1950 View Post
!/12th tires are all foam. They are generally trued down from as sold size for performance reasons. They do not need to be trued between rounds, though some racers will smooth them up.
2S is raced in Japan, everywhere else it's 1 cell.
NO, all brands are not compatible with all cars, though most are interchangeable. Yokomo in particular uses a unique wheel.
Compared to offroad cars 1/12th is very low maintenance.
They look the same, but are all slightly different. Buy one that some of your local racers have so you can get help if you need it.
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Old 08-09-2014, 02:41 PM   #41098
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double post.
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Old 08-09-2014, 02:41 PM   #41099
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Hi guys,

IF, and only if, we could use rubber tires for 12th scale, then should we still choose the gearing by applying the Rollout formula or the standard FDR formula for TC ?

I understand that it is uncommon, and I am just asking out of my curiosity.

Thanks
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Old 08-09-2014, 03:06 PM   #41100
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There's no reason you couldn't still use roll out if you wanted.
It's just that the roll out won't change with tyre wear.
FDR is probably a little easier for some to understand because most guys have always used this for other cars.
I use fdr for my TC, but I prefere using rollout as it's easier for me to visualize what my car will do per rpm on the track.
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