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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 01-13-2009, 08:47 AM   #30346
HB
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Thanx Uga
i will try that
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Old 01-13-2009, 09:34 AM   #30347
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Quote:
Originally Posted by PartTime View Post
Quick question, how do you know when to adjust the side spring or the shock when looking for rear traction. Just switched to lipo and am expecting the rear to be lose but dont know when to look at the side springs or the shock to do what I need it to do?

Thanks
DK
I ran softer front springs and a soft center spring. everything else was the same. my car drove differently - it agressively turned in but traction was solid for 8 minutes. I ran lilac front/magenta rear instead of lilac front/yellow rear
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Old 01-14-2009, 01:01 PM   #30348
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I could not even think about reading 30,000 plus replies in this thread so I will get to my point. I would like to get a kit but don't know where to start. I have been out of racing 1/12 scale since 85 and I know I will get laughed at if I show up with my Delta cira80's car Advice Please?
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Old 01-14-2009, 02:18 PM   #30349
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Originally Posted by gashuffer View Post
I could not even think about reading 30,000 plus replies in this thread so I will get to my point. I would like to get a kit but don't know where to start. I have been out of racing 1/12 scale since 85 and I know I will get laughed at if I show up with my Delta cira80's car Advice Please?
If you drive the Delta and win, my guess is, nobody will be laughing but you.

It depends on what kind of car you want to drive - T-bar, Link, BMI link-T-bar-whatever they call that car. Are you going to drive on asphalt or carpet?

Tell us a little about you childhood.......oh that's something else.
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Old 01-14-2009, 03:19 PM   #30350
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Well guys we are glad to say the kit is done and we are shipping to dealers today,We are very happy with the product.
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Old 01-14-2009, 03:26 PM   #30351
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Hi Guys
Just a quick question for you all !
I have just built a rc12r5 and want to know how easy ( if ) i can put metric hubs on the rear wheels as the car is all metric now apart from the rear wheel bolts which are imperial
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Old 01-14-2009, 06:38 PM   #30352
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Quote:
Originally Posted by gashuffer View Post
I could not even think about reading 30,000 plus replies in this thread so I will get to my point. I would like to get a kit but don't know where to start. I have been out of racing 1/12 scale since 85 and I know I will get laughed at if I show up with my Delta cira80's car Advice Please?
What ever you don't listen to us liars on the internet. Make sure you stop by your local track first for a race day. See what cars are winning, what people are running, and what parts they have.

Shop Local. Race Local.
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Old 01-14-2009, 09:45 PM   #30353
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For changing the 12r5 over to metric- I do not think that would be very easy to do, the only car I can think of that MIGHT have the same style hubs would be the Hotbodies car, not sure if they are metric or not, not enough material on the R5 hub to retap to metric, or move the holes, Corally uses metric wheel screws but the hubs are very different and made for a different size axle. Bottom line is might just have to put up with the screws the way they are, get a few extras and the right size wrench, probalby cheaper and better in the long run than trying to convert, maybe somone else will know of a way to do this conversion...
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Old 01-15-2009, 01:00 AM   #30354
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Quote:
Originally Posted by Ffejdat View Post
For changing the 12r5 over to metric- I do not think that would be very easy to do, the only car I can think of that MIGHT have the same style hubs would be the Hotbodies car, not sure if they are metric or not, not enough material on the R5 hub to retap to metric, or move the holes, Corally uses metric wheel screws but the hubs are very different and made for a different size axle. Bottom line is might just have to put up with the screws the way they are, get a few extras and the right size wrench, probalby cheaper and better in the long run than trying to convert, maybe somone else will know of a way to do this conversion...
The Hot Bodies 12x hubs use M2.6 screws, so yes they are metric. 2mm allen driver will fit the screws. They will fit on a standard (IRS) axle.

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Old 01-15-2009, 04:04 AM   #30355
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Hi,

it is no problem to convert the rear hubs to metrical size. Just take an M3 thread drill and tap a thread over the imperial one. It's a perfect fit.

Only real change will be that you have to use screws with a smaller head. I trimmed off some material using a lathe but Serpent makes some screws aswell.

Cheers
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Old 01-15-2009, 07:48 PM   #30356
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I am really tempted to bring this old car back out just to see if it would perform anywhere close to the current offering of 1/12 scale cars!



It's a Delta Super Spider that I ran for a few years back in the early '90s. Yea, the shocks are a pain in the butt and I doubt you could squeeze a brushlees in it, but it would be cool. I had a guy inquire about buying in and after digging through countless parts bins and boxes came up with an almost complete car. Now I just need to find some 2 bolt rear wheels for it.
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Old 01-15-2009, 07:51 PM   #30357
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Originally Posted by SteveL View Post
I am really tempted to bring this old car back out just to see if it would perform anywhere close to the current offering of 1/12 scale cars!



It's a Delta Super Spider that I ran for a few years back in the early '90s. Yea, the shocks are a pain in the butt and I doubt you could squeeze a brushlees in it, but it would be cool. I had a guy inquire about buying in and after digging through countless parts bins and boxes came up with an almost complete car. Now I just need to find some 2 bolt rear wheels for it.
I love it, if you really need some of the two bolt wheels lmk I have a set or two I could send you.
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Old 01-15-2009, 08:02 PM   #30358
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I bet I still have some Delta Golds with those sweet red rims.
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Old 01-15-2009, 08:16 PM   #30359
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That car may still be competitive if setup right. Speed Merchant still used the old non-active front end on their cars up to this latest version. All the modern 1/12th shocks are still based off of the original Delta design so if you want shocks that are less of a pain you could probably swap them out with an IRS, CRC, or maybe even the new Silva shock.

Very nice looking car!
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Old 01-15-2009, 08:22 PM   #30360
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that car looks pretty hot! I dig the rear pod and the front end. If you released a car like that now without knowing the history behind it people would say words like "revolutionary" etc...
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