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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 11-25-2003, 07:12 AM   #5251
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What does changing bump steer do to the handling of a 12th scale car ?

Thanx.
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Old 11-25-2003, 07:21 AM   #5252
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Quote:
Originally posted by Mike D
Brolzy - Associated
Thanks Mike, good luck in Cleveland this week!
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Old 11-25-2003, 09:12 AM   #5253
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Thumbs up Snowplow push

Stormperson,
Thanks for the fix, my ck is not puahing now. At your insistance that I had a bind or rub I disassambled the car to find the "football" had shifted to the left (cocked) it must have happened at the end of last years carpet season . I reassamdled the car to find that the push has magicly dissappered and now handles like a dream with tons of side bite and terrific corner speed. Also the low speed handling has become more calm and predictable. Now I have to adjust my driving style to a more racable car.
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Old 11-25-2003, 09:32 AM   #5254
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Default Foams diameter?

Raced my 12th scale for the first time after 14 years of absent, it was a blast........however, I was using a brand new set of foams that I didn't TRUE for the RACE diameter, because i have no idea what is the BEST diameter for the 12th scale...

Can someone tell me...? My TRC were 54mm (rear) when it was new...at the end of the race, it goes down to 52mm......however, all the fast guy are runnning something thinner..........will that be 46mm?

I know that has to do with the gears too(the roll out thingy)....but I just want to know, what diameter of new R/F foams that I should true down to....? With the new foams, the body has clearence problem too, especially the front wheel when it trun all the way to the left and right.
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Old 11-25-2003, 09:55 AM   #5255
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Based on suggestions from more experienced drivers than me (Mike D), I true my tires to: (rear 48.5mm front 44mm).

I just got the new lowered bulk heads from Calandra and now I can run my rear tires even longer. BTW, $29 for the new CRC rear bulk heads is a great deal.
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Old 11-25-2003, 10:23 AM   #5256
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Quote:
Originally posted by Geppetto
Based on suggestions from more experienced drivers than me (Mike D), I true my tires to: (rear 48.5mm front 44mm).
Thanks.........thats all I need to know. I was playing cheap, try to save foams, but "Cheap" costed me a 3rd place finish, and I knew the tires are the key...

Locking both left/right tires while turning does not help (Tires rubbing the body when it turns....stupid me.)
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Old 11-25-2003, 10:36 AM   #5257
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Quote:
Originally posted by Rookie Solara
Thanks.........thats all I need to know. I was playing cheap, try to save foams, but "Cheap" costed me a 3rd place finish, and I knew the tires are the key...

Locking both left/right tires while turning does not help (Tires rubbing the body when it turns....stupid me.)
Actually the first 6 or 7 mm wears off pretty quickly. When you get 'em down to 47 mm or so you'll see the rate of wear start to slow down.
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Old 11-25-2003, 10:43 AM   #5258
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Quote:
Originally posted by Manfredo
What does changing bump steer do to the handling of a 12th scale car ?

Thanx.
Bump steer gives the car more steering as the suspension compresses. This is a bad thing for a 1/12. Ideally you want the wheel to stay in its current position before and after the suspension is compressed.
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Old 11-25-2003, 10:54 AM   #5259
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I true my tires down to 1.8 for the fronts and 1.9 for the rears (in inches). It makes a HUGE difference, also make sure to round them so they dont chunk or traction roll. If you run them out of the box your car will be really scary to drive since your sidewalls will give you too much grip. Also If your tires are really small dont expect the car to handle as well, since your shore rating is no longer accurate because there is not enough foam. So watch out with the lowered bulkheads. Normally I would not suggest running your tire down that low if you can help it.
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Old 11-25-2003, 11:04 AM   #5260
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Quote:
Originally posted by stormperson
I true my tires down to 1.8 for the fronts and 1.9 for the rears (in inches). It makes a HUGE difference, also make sure to round them so they dont chunk or traction roll. If you run them out of the box your car will be really scary to drive since your sidewalls will give you too much grip. Also If your tires are really small dont expect the car to handle as well, since your shore rating is no longer accurate because there is not enough foam. So watch out with the lowered bulkheads. Normally I would not suggest running your tire down that low if you can help it.
I've run some extremely small tires before and I've found that on SUPER high bite tracks it makes the car more consistent and actually let's it flow better.
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Old 11-25-2003, 11:19 AM   #5261
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Then let say......a good rear tires diameter (for race) is like 46mm to 48mm diameter range, and 43mm to 45mm front....?
Then........what is too small...? 35mm rear and 33mm front? Thanks
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Old 11-25-2003, 11:26 AM   #5262
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When you see the color of the rim where there use to be tire then I would say you have got your moneys worth from that set of skins.
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Old 11-25-2003, 11:30 AM   #5263
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Quote:
Originally posted by Smalls
When you see the color of the rim where there use to be tire then I would say you have got your moneys worth from that set of skins.
So are you saying I cannot run my 12th scale with RIMS only...? Come on....1mm of foams still foams, I did that on my gas car while running a 2.4 hour endurance race before (not realized that untill the rim broke off into 10,000 pieces)....
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Old 11-25-2003, 12:00 PM   #5264
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Normally for club racing...

If you are on the lowest ride height (I think #4 carriers) and under 3mm of ride height you probably want to buy some new tires.
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Old 11-25-2003, 12:54 PM   #5265
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Storm-
been gone a few days but yes, I broke the new all black SM tubes, and so did another driver at our last race. I admit it takes my kind of talent, but I was surprised how easily they broke this time-like just as easily as the old ones.
And I've still never bent a CRC tube, not in the way you describe or otherwise.
O'D
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