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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 06-08-2008, 01:48 PM   #28846
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Quote:
Originally Posted by c-lyon View Post
Good to hear you're coming back, Ophie. I ran an old CRC (Dave's old car) at DTP. It was a joy to drive after Kelly solved a minor problem which was my fault. And it's possible that KARZ may be running 1/12 in the winter...only minis at the moment.
News is alot better than the last time we talked. So I'm back. I might go to the track next race day.
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Old 06-08-2008, 01:49 PM   #28847
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Thanks for the help guys. I'll stop by the LHS this week and see what to get.
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Old 06-08-2008, 02:47 PM   #28848
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Originally Posted by InspGadgt View Post
Parts availability is always something to consider. If you LHS carries the parts that's great. The GenX has been around a bit but unless your LHS carries parts in stock for it you'll need to order them. The 12R5 is still new on the market and I imagine parts availablity will be good for them in the future but it's probably a bit light right now. One thing to consider though is both of them use very little standard parts. That being parts that are based on the older 12L designs. So there isn't much cross platform support except for maybe the rear axle. Many of the other companies like BMI, Darkside, Diggity and others, still use the AE Dynamic Strut front end, AE style rear axle, and in many cases even the rear pod plates. This makes parts availability a bit easier. I guess it really boils down to what parts you local shop carries.
One thing I like about CRC is their intense Rand D development. Don't get me wrong, all the other companies do great R and D, but literally, every month there is a new option part for the Gen X. BMI you might see something new every other month. As you can see I am not very biased. I have the DB12R and it is great and have no complaints. Just giving my opinion based on my observations.
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Old 06-08-2008, 03:10 PM   #28849
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We try not to do too many changes so we put more time into R&D initially to avoid constant changes. This in return saves the end user or customer some money by taking our time in the developement stages. Making changes along the way shows the mistakes we made or things we missed.
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Old 06-08-2008, 03:20 PM   #28850
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We try not to do too many changes so we put more time into R&D initially to avoid constant changes. This in return saves the end user or customer some money by taking our time in the developement stages. Making changes along the way shows the mistakes we made or things we missed.
Well said, BTW the db12 is probably the best car I have owned to date not just 12ths but any car I have owned in rc. I have run a crc 3.2r, diggity cd12, and a crc gen x, and my bmi. The bmi was the best and by far the most consistent.
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Old 06-08-2008, 06:11 PM   #28851
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Iíve just put Novak 6.5L (Blue one) in my L4. What roll out should I be using on 100ft. straight out door track with low-mid grip?
I ran 47mm rollout on a carpet track that size. The motor and LRP speedo were both about 130-140 degrees. With the lower bite asphalt I would start with a rollout just a little lower and go from there.
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Old 06-08-2008, 10:19 PM   #28852
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Default 1/12th scale car bag

does anyone have a recommendation for a bag to carry 1/12th scale cars? i'm tried of stuffing them into a body bag or having them nearly fall off my tool box. i'm cool w/ removing my roll over antenna every time.
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Old 06-08-2008, 10:34 PM   #28853
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Originally Posted by hanulec View Post
does anyone have a recommendation for a bag to carry 1/12th scale cars? i'm tried of stuffing them into a body bag or having them nearly fall off my tool box. i'm cool w/ removing my roll over antenna every time.

I have one of those trinity bags with three cardboard boxes, I can lay two cars down on their side in one box and use the antenna to lock them together. Works well because that way thay are not sitting on the tires and creating a flat spot.
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Old 06-08-2008, 10:45 PM   #28854
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I have one of those trinity bags with three cardboard boxes, I can lay two cars down on their side in one box and use the antenna to lock them together. Works well because that way thay are not sitting on the tires and creating a flat spot.
Is it the TM-8/10 bag? How big is the cardboard box?

i just measured by REV5 and w/ a speed 12 body and roll over the size currently approx 6.75" w x 12.5" l x 8.75" h. the car w/o the roll over is 3.5" h. i guess if i found a box 12.5" x 12.5" x 7" high two cars could fit on their sides.
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Last edited by hanulec; 06-08-2008 at 11:13 PM. Reason: added 1/12th size
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Old 06-09-2008, 02:11 AM   #28855
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Originally Posted by gubbs3 View Post
I ran 47mm rollout on a carpet track that size. The motor and LRP speedo were both about 130-140 degrees. With the lower bite asphalt I would start with a rollout just a little lower and go from there.
Thanks, I'll start from that.
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Old 06-09-2008, 07:15 AM   #28856
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Originally Posted by hanulec View Post
Is it the TM-8/10 bag? How big is the cardboard box?

i just measured by REV5 and w/ a speed 12 body and roll over the size currently approx 6.75" w x 12.5" l x 8.75" h. the car w/o the roll over is 3.5" h. i guess if i found a box 12.5" x 12.5" x 7" high two cars could fit on their sides.
the t8/f8 bag will fit a 1/12 in the 4 smaller boxes.

what I would like to see is a removable antenna mount/shock mount combo that would fit the same mounting points.
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Old 06-09-2008, 01:06 PM   #28857
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Default Looking for a new 1/12 scale. any suggestions?

I am looking to pruchase a new 1/12 scale for this up coming carpet season.This may be a question that is asked a lot but i guess I really dont know what is new out there? Any suggestions would be very helpful. BMI? CRC? 12R5? pros and cons?
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Old 06-09-2008, 04:19 PM   #28858
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Everybody is going to tell you to buy the car they have, hence the lack of an answer to your original question. Gadget is right of course, all the top cars are capable of doing the job.

some thoughts:

GenX has been around for a bit and has evolved into an even better car than when it was introduced. It has a proven track record. Parts availability is very good even if your local track doesn't carry them, but if there are GenXs running there, they probably do.

12R5 is new, and since it hasn't been run for very long has not much of a track record. AE has done lots of testing, and considering the lineage I wouldn't be worried about its performance. There are some nice ideas in the front end and shocks that are rather new. Parts for AE cars have always been among the most available of any brand so once the car is out there in some numbers, shops will be carrying the parts.

Both are link cars so they will be similar to set up and run
Lots of good advice in the above post. As you also asked I'll put in my two cents on the BMI. Like the new 12R5 the DB12R is still rather new and while it has placed well in the hands of a few pro team drivers its too early to say just how successfull the car will/can be. That said I love my BMI 1/12, fit and finish to the parts reminds me of an xray car and its been a very smooth car to drive for me. Now if only the driver was a good as the car.
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Old 06-09-2008, 11:43 PM   #28859
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To balance Chris's view, the BMI DB12R has been out for over a year, and like Chris says it is the best car to build since an X-Ray, and the best 12th build by far. Everyone who has bought one and raced in our National series loves the car, finds it fast and good to drive straight out of the box, and has improved their results.

All cars will only be successful when placed in the hands of Pro/Team drivers - 12th is a driver's class, not a 'car'-to-have' class! No car is likely to get me from the lower reaches of the Top 30 to an A Main winner!! BMI have chosen not to 'buy' a Pro/Team driver, so those who have the car have chosen to have it. The fact that some of those drivers have won some significant events says more to me about the car's capability than winning a major event by giving it to someone who we all know can win.

As you can see from all these posts, there really isn't one car to have in 12th. IME, if you choose from Associated, CRC, HB, BMI and Speedmerchant, you won't get a bad car. The choice you make should be dictated more by the cars running at your local Club than anything else. It is more useful to be able to get set-up and driving advice than anything else, so go with what the local Club drivers use, and is stocked in your LHS. HTH
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Old 06-13-2008, 05:53 PM   #28860
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Hi Guys,

Sorry if this has been discussed before but I don't have time to trawl through the rest of the thread. I got a car back I had leant over 3 years ago and I have to have it ready to race in about 7 hours - and I'm pretty sure I'll have to make a trip to the hobby shop.

I need an approximate gear ratio (or rollout but I think in gear ratio) for 4 cell 1/12th stock. The races are 6 minutes long. The track is carpet (actually astroturf) and on the tight side.

I'll be running a Trinity Monster of Horse Power motor and 3300 cells - not that that's going to make much difference.

Any advice would be appreciated. A rough estimate will be more than enough.
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