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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 08-29-2006, 05:46 PM   #20251
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Quote:
Originally Posted by Rob Phillips
Couple of Q's

Rear axle bearings, 3 1/4 x 3/8 flanged and 1 non-flanged, right? Trying to remember what bearings I need to order. Don't have my car right now and need to get the order out.

Also, could someone help me identify my axle. It's big ring style, black hubs, yellow nut, maybe trinity ot niftech? The clamping hub is similar to IRS's but it has a counter weight added to the side opposite of the screw. I'll post a pic later when I get home.

Thanks
Your axle in black is a Trinity. They have the counterweighted clamping hub. Niftech axles and hubs only come in polished aluminum.
If you've never had Niftech diff, you are missing the Ferrari of 1/12th diffs.

All the axles I use (Niftech or IRS) use two 1/4x3/8 flanged bearings on the axle, two of the same on the in and outside of the right hub and one 1/4x3/8 unflanged on the spur. I don't think it matters if you use an unflanged bearing on the inside of the right hub though.
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Last edited by odpurple; 08-29-2006 at 08:42 PM.
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Old 08-29-2006, 05:56 PM   #20252
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Default Flanged vs: Unflanged...battle on the Stub Axle

OK...moving forward (literally)

Front axles/wheels...flanged or unflanged? I know Jaco can go either way, as can (I think) CRC's. I spent last year running a lot of TRC which required flanged (no lips or lugs in the bearing bore of the wheels).

Say I've got a choice, how say ye?

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Old 08-29-2006, 06:53 PM   #20253
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Quote:
Originally Posted by AdrianM
Thanks guys the 9602 looks to be the same as the 94145 specs wise. I just asked my LHS to get one for me.

I can't believe I forgot about that servo. That's what Jason uses and its great.

Adrian I replaced the airtronics 94145 with a futaba 9602 3 years ago and can say they are a stout servo.
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Old 08-29-2006, 07:04 PM   #20254
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Ok so i need something clearing up for me:
I just read on the AE belt car thread that the L in RC12L stands for Losi, as in it was designed by Gil Losi Jr. That right? If so ive learnt something new today, by the way, what was losi doing designing for associated cos i believe the RC12L was released in the 80s when Losi was already an up and running RC company. Someone correct me if im wrong!
Cant believe i ran Losis for over 10 years and didnt know any of this!
Thanks for your help.
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Old 08-29-2006, 07:18 PM   #20255
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If the rim being used doesn't care whether it is flanged or unflanged, it comes down to what happens to the front width. The flanged bearings will widen the width of the car, which can affect handling.

I run all Parma tires and their 1/12th front wheels require flanged bearings so I have no choice. However, when I ran unflanged rims I had the wheels spaced out the same amount anyways so moving to the flanged wasn't a big deal.

However, this is all assuming the wheel offsets and widths are the same between the different brands.

-Rich

Quote:
Originally Posted by Scottrik
Front axles/wheels...flanged or unflanged? I know Jaco can go either way, as can (I think) CRC's. I spent last year running a lot of TRC which required flanged (no lips or lugs in the bearing bore of the wheels).

Scottrik
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Old 08-29-2006, 08:31 PM   #20256
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Quote:
Originally Posted by odpurple
Your axle in black is a Trinity. They have the counterweighted clamping hub. Niftech axles and hubs only come in polished aluminum.
If you've never had Niftech diff, you are missing the Ferrari of 1/12th diffs.

All the axles I use (Niftech or IRS) use two 1/4x3/8 flanged bearings on the axle, two of the same on the in and outside of the right hub and one 1/4x3/8 unflanged on the spur. I don't think it matters if you use and unflanged bearing on the inside of the right hub though.
hey OD,

have you tried the raimen(spelling?) axle yet?those are pretty awesome also.ive been running one now for about 4 months and really like it.
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Old 08-29-2006, 08:49 PM   #20257
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Quote:
Originally Posted by protc3
hey OD,

have you tried the raimen(spelling?) axle yet?those are pretty awesome also.ive been running one now for about 4 months and really like it.

Well, I would like to, but I have tried to order some a couple of times and they were out of stock. I got right hubs (nothing special) and some real nice front suspension shims, but no axles. Riemon...

I think Adrian is holding out on me!
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Old 08-29-2006, 09:04 PM   #20258
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I don't know what up with Riemon. We have recieved two shipments now with Kawada axles and rt. hubs in Associated compatable header cards
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Old 08-29-2006, 09:44 PM   #20259
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Joe, you ever plan on comming back up to trackside? We could use more 12th's here. Plus I hear you have an L4, and mine is awesome. I can lend you a hand if you want it
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Old 08-29-2006, 09:45 PM   #20260
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Quote:
Originally Posted by AdrianM
I don't know what up with Riemon. We have recieved two shipments now with Kawada axles and rt. hubs in Associated compatable header cards
yeah, sure. You just don't want me to have the Bling!

would you please post here when some come in? thanks
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Old 08-29-2006, 11:52 PM   #20261
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Hi all!
I just wanted to poke my head back in hear to let everyone know that I am still here. Big news from the Slapmaster factory, I am nearing completion of a new work shop for production. In the '05-06 winter season, I to had lease a space which I vacated this past April. I made up as much inventory as I could to get through the summer knowing that a new shop would be built. The work benches are going in right now and lots of shelving. A really cool dust collection-ventilation system has been installed in the cut booth for cutting the chassis out. All the machine equipment will come out of storeage and get remounted in the next day or two. Production should start back up in the next couple of weeks.

I see that many are chatting about the thrust bearings. They continue to amaze me. So much, I am considering offering a lifetime guarantee. I have not been able to wear mine out. I ran my 3 year old diff's at Nats this year. Everyone I showed them to, couldn't beleive it. I have only heard of two that have failed that were likely used on a dusty out door track. Beyond that, I have not heard of any of the thrust races wearing out through normal useage. If anyone has worn one out, I would like to know: blbodine@comcast.net How many r/c products can you claim that have a unknown life expectancy? ... on the positive side!

BTW: the thrust race replaces the cone and bellevel washer, but the 1/4x3/8" bearing remains in the hub. It's now a radial bearing (like it was designed to be) and just centers up your wheel hub.

I have decided to do just a running change on the MS2.3 rather then a giving it a new designation. I will change the mold enough to get back to the smaller front tire diameter like the 2.2 used. It will be able to use a tire down to 1.60 whereas the 2.3 could only get to a 1.66 with common parts. I will also add two holes in the rear so that CRC upper chassis brace can be added. You will be able to mount the damper tubes near flat for those high bite race tracks. Down low for the med-low bite. Up high or flat for those high bite tracks.

Dan Garber is my latest driver piloting the MS2.3 at his local home track; Seattle Indoor Raceway. Dan has evolved from the Tamiya series. He has even taken Tamiya Series Championship a few years back. Dan's understanding of race cars is very impressive and together we should have even more refinements for the MS line up. You know that there will be some fun prototype stuff showing up from time to time.

Foam bumpers are still available. I knew that they didn't weigh very much, but I never checked them. I took 10 of them and put them on a gram scale... it showed 20 grams or 2 grams each. Amazing.

My website is still very stagnent. Someday I will get around to putting my latest products on there. You can still reach me through it. www.slapmastertools.com

Thanks for your support!
Brian
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Old 08-29-2006, 11:54 PM   #20262
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Quote:
Originally Posted by odpurple
I think Adrian is holding out on me!
Yeah...he's holding out on me too!! J/K
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Old 08-30-2006, 12:10 AM   #20263
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Thanks for the update Brian.

Bill
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Old 08-30-2006, 12:12 AM   #20264
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Quote:
Originally Posted by JayBee
Yeah...he's holding out on me too!! J/K
Maybe we're gonna have to go down to Fla and talk to the man...Road Trip!
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Old 08-30-2006, 04:26 AM   #20265
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Quote:
Originally Posted by Switch Blade
Joe, you ever plan on comming back up to trackside? We could use more 12th's here. Plus I hear you have an L4, and mine is awesome. I can lend you a hand if you want it
I will make it up eventually. I got Ike's T-Force off of him. I am hoping to make it up to His-n-Hers Saturday. That is why I called the other night.
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