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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 06-11-2014, 03:22 AM   #40816
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Quote:
Originally Posted by I)arkness View Post
need some opinions of the Spider Grip - Green Extra Strong additive for those of you that have used it.

Ive got a chance of getting some but its going to cost me a pretty penny to get it.
Is it worth it??

Have tried quite a few different additives on local track (asphalt indoors) and have found the LRP Top Grip Carpet 3 works the best so far but if the spider grip is even better, then i guess ill be adding to cart.

Thanks in advance
Quote:
Originally Posted by Andrew S View Post
I would also like some honest opinions on this spider grip, how it compares to others out there.
Specifically, I'm after the most possible grip for foam tyres on ashfelt.
The other requirement is something that last 8mins!
I don't know of anyone who has run it on foams on asphalt.
But on carpet it appears to be the main additive of choice, that and the Blue version. The other is SXT 3.0
I have used the green on foam and rubber tyres on carpet and love it, but if anyone is going to use it on rubber tyres I would get a dispensing bottle for it. The brush is fine for foams but a bit wasteful when applying to rubber tyres.
Ollie Jefferies used the Green and Blue to win the UK 1/12 Mod championship.

Skiddins
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Old 06-11-2014, 04:27 AM   #40817
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Default 30 plus?

hi guys, new to 1/12th but loving it, searching for rear traction and have recieved some good advice so far and am making progress, question i have for anyone while we are talking additives is i have been given advice to use sun screen lotion 30 + on top of the additive on foam tyres, i have been told it makes the additive last longer, i am going to try it out when i get the chance as i have been told this by a couple of reputable (RE More knowledgeble then me) people, just want to see if anyone else can add their opinions or experience with this practice.
thanks in advance
cheers
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Old 06-11-2014, 05:29 AM   #40818
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Quote:
Originally Posted by oldenuff View Post
hi guys, new to 1/12th but loving it, searching for rear traction and have recieved some good advice so far and am making progress, question i have for anyone while we are talking additives is i have been given advice to use sun screen lotion 30 + on top of the additive on foam tyres, i have been told it makes the additive last longer, i am going to try it out when i get the chance as i have been told this by a couple of reputable (RE More knowledgeble then me) people, just want to see if anyone else can add their opinions or experience with this practice.
thanks in advance
cheers
oldenuff
I seem to recall being told about the suncream thing, but that was for asphalt.
At the UK nationals (100+ on carpet) drivers, I've never seen anyone using this trick, including Dave Spashett, Ollie Jefferies, Elliott Harper etc.
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Old 06-11-2014, 06:11 AM   #40819
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thanks for the reply skiddens, unlike most 1/12th's my little serpent is run exclusively on a large outdoor asphalt track.... i guess this means i need to give it a go , and i will add you to the list of people that has heard about this old school trick.
cheers
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Old 06-11-2014, 06:17 AM   #40820
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Quote:
Originally Posted by oldenuff View Post
thanks for the reply skiddens, unlike most 1/12th's my little serpent is run exclusively on a large outdoor asphalt track.... i guess this means i need to give it a go , and i will add you to the list of people that has heard about this old school trick.
cheers
oldenuff
If you can get BSR 1/12 tires get some red's and orange rears for asphalt.
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Old 06-11-2014, 06:32 AM   #40821
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hi guys, sorry for my rookie question but i don't think i have heard of BSR tyres, And I am not sure if i can get them in Australia, but if i do come across them i will buy a set and give them a go,. I currently run ULTI tyres, i dont know if you guys get them and i have nothing to guage them against in my 1/12th as that is all i have tried so far, i am currently experimenting with different compounds, all i do know is they work really well on my lola bodied Xray T4 and i have tried plenty of different tyres on this but find the ULTI's the best,.. well for my track anyway.
cheers
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Old 06-11-2014, 06:50 AM   #40822
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Quote:
Originally Posted by oldenuff View Post
thanks for the reply skiddens, unlike most 1/12th's my little serpent is run exclusively on a large outdoor asphalt track.... i guess this means i need to give it a go , and i will add you to the list of people that has heard about this old school trick.
cheers
oldenuff
Quote:
Originally Posted by idbdoug View Post
If you can get BSR 1/12 tires get some red's and orange rears for asphalt.
idbdoug
If anyone comes across the perfect outdoor foam tyres for medium grip asphalt please tell us
My one attem,pt at running a 1/12 outdoors was a nightmare due to the massive difference in balance front/rear outdoors.
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Old 06-11-2014, 07:08 AM   #40823
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Default outdoor 1/12th

skiddens , my local track IS medium traction asphalt and i am working on it ,...... I may need some time,... I will find the right setup eventually , i know it can be done, as i have seen footage of a night race at my local track from a few years back, if you want to view it look thru the GWSRCCC thread in the australian racing forum.
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Old 06-11-2014, 08:02 AM   #40824
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Quote:
Originally Posted by Skiddins View Post
If anyone comes across the perfect outdoor foam tyres for medium grip asphalt please tell us
My one attem,pt at running a 1/12 outdoors was a nightmare due to the massive difference in balance front/rear outdoors.
I will be testing this weekend. Ran on a non prepped indoor asphalt track last weekend. Traction was great. I used yellow rears and double pink fronts. Also used Magenta rears and magenta fronts with success too.
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Old 06-11-2014, 08:22 AM   #40825
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There is no such thing as a "perfect" set of foam for asphalt

All surfaces are different

When I go to a new asphalt track, I bring 2 types of tire to test
Of course I would ask the locals first to save time and $ if that's an option...
This combination of tires will work virtually everywhere
Once you know which type feel ok, you can fine tune from there on the next visit, with harder, or softer front/rear of the type which worked best


Front:
Double Pink (Ulti X-Hard)
Magenta (Ulti J-Hard)

Rear:
Yellow (Ulti X-Soft)
Magenta (Ulti J-Soft)
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Old 06-11-2014, 09:32 AM   #40826
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Originally Posted by swimbikerun View Post
If you get an Associated/IRS style rear axle/hubs you can run Jacos if you shim out the non spur side by 5mm. You'll be at 172mm which is max. Anything with more offset than Jaco would also work as well.
I have xray x12 - can I use it's hubs?
Really want to try yokomo for next winter, but buying 2 different type of tyres isn't good
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Old 06-11-2014, 11:36 AM   #40827
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Could some one explain - does yokomo r12c3 have special hubs?
I don't know Yokomo's offset, but they've moved the center of gravity closer the the center of the tire which is theoretically better.

I'm guessing the high positive offset that most 1/12th cars have is because the hubs become smaller/lighter.
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Old 06-11-2014, 01:09 PM   #40828
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Which do you guys like better, Panaracer or PRS pinions?
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Old 06-11-2014, 01:20 PM   #40829
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PRS pinions if you can find all the sizes.
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Old 06-11-2014, 01:50 PM   #40830
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From what I've heard
Yokomo have found the best wheel flex, using a design with that off-set
That is the only wheel I would use if I were running an R12C

Xenon pinion gears are top notch
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