Associated Foam Tires - Standard size

[GreenBar0n]

I'm trying to find foam tires for what is said to be a standard Associated wheel size. The place I'm getting the standard wheel size from, is according to the Mini-Mags ad:

A10-Fs fit RC10 and use standard size ASSOC. tires

The wheel dimensions that I have:
Caliper measurement = Converted to Fraction
1.7" = 1 11/16" - Front & Rear diameter

0.75" = 3/4" - Front width

1.35" = 1 11/32" - Rear width


Were the foam tires different sizes for the 1/10 and 1/12 on road Associated cars? Is there anywhere I can find the specs for the on-road foam tires?

Thanks!

[GreenBar0n]

Going to document what I find here, in the pursuit of the correct foam donuts.


What the Dot Colors mean on foam donuts (how much rubber is in the foam) - taken from old forum posts at:
https://www.hobbytalk.com/threads/foam-tire-chart.132548/

FOAM TIRES:
Color Durometer Notes
BSR Yellow 33 Low traction carpet tracks (rears only).
BSR Green 42 Medium traction carpet tracks.
BSR Blue 44 High traction carpet tracks.
BSR 2 Blue 46 Extremely high traction carpet tracks and on asphalt.
BSR 3 Blue 62 Extremely high traction carpet tracks and abrasive concrete tracks.(fronts only).
BSR Orange 58 High traction carpet and abrasive pavement tracks.
BSR Pink 33 Low traction asphalt tracks and as the inside rear on medium bite carpet tracks.
BSR White 35 Medium traction carpet and asphalt tracks. Works well in modified racing.
BSR Black 38 Medium traction carpet and asphalt. Low wear / longer lasting.
BSR Gray 40 Medium traction /abrasive asphalt tracks. Low wear / longer lasting.
BSR Purple 45 High traction asphalt or carpet tracks. Low wear / longer lasting.
BSR Hard Purple 50 High traction asphalt and concrete tracks. Lower wear / longer lasting.
BSR Red 55 High traction asphalt tracks. Lowest wear / longest lasting.
Jaco Yellow 20 High traction. Carpet/Asphalt.
Jaco Green 25 High traction. Carpet/Asphalt.
Jaco Blue Rear 30 Moderate traction. Carpet/Asphalt.
Jaco Blue Front 40+ Low traction. Carpet/Asphalt.
Jaco Blue/Orange 30-40 Moderate traction. Carpet.
Jaco Aqua 27 Moderate traction. Asphalt Special.
Jaco White 25 Moderate traction. Carpet.
Jaco Grey 30+ Moderate traction. Carpet.
Jaco Pink 25 Excellent traction. Asphalt.
Jaco Purple 40 Excellent traction. Asphalt/Carpet.
Jaco Red 40+ Excellent traction. Asphalt/Carpet.
Jaco Silver 20 Very Good traction. Dusty Asphalt.
Jaco Gold 25 Very Good traction. Dusty Asphalt.
TRC Green 29-30 Good for rears outdoors or indoors on low bite tracks. Normal wear. Carpet or asphalt.
TRC Blue 39-40 Good front outdoors or harder rear on high bite tracks. Normal wear. Carpet or asphalt.
TRC Dbl. Blue 50-51 Good for on-road fronts on low bite tracks, outdoors. Normal wear. Carpet or asphalt.
TRC Orange 54-55 Good for low-bite on-road tracks or an oval right front. Normal wear. Carpet or asphalt.
TRC White 25-26 Good rear for lower bite carpet tracks. Normal wear. Typically carpet only.
TRC Gray 29-30 Excellent for on-road rears on carpet. Normal wear. Typically carpet only.
TRC Black 36-37 Good for very high bite carpet tracks. Normal wear. Typically carpet only.
TRC Platinum 25 Good for on-road asphalt in low bite conditions. Low wear. Carpet or asphalt.
TRC Pink 30 Excellent for rear on-road asphalt, carpet oval rear tire. Low wear. Carpet or asphalt.
TRC Purple 40 Good for fronts any surface, touring front and rear any surface. Low wear. Carpet or asphalt.
TRC Dbl. Purple 42-45 Good for fronts mostly carpet touring or nitro touring. Low wear. Carpet or asphalt.
TRC Red 45 Good for fronts mostly outdoor nitro touring or right front oval. Low wear. Carpet or asphalt.



New BSR list
Yellow - Duro 25-30; Softest compound (rears only). This is a new foam that we have just released (12/1/2004). Super soft for low bite stock racing. Available but still in testing.
Black - Duro 40-45 Awesome right side tire on carpet tracks. Works well for left front on banked tracks. Good right rear tire on very high bite tracks in stock.

Green - Duro 30-35; Medium-soft Traditional US green.
Firm Blue - Duro 55-65; Hard compound recommended on high traction banked carpet tracks. Also offered as a spec tire for front tires.
Gold - Duro 40-45; Medium-firm for high bite carpet tracks. Silver and gold are BSR exclusive compounds from Japan (not the old TRC silver and gold). A gold at 40 and a gray at 40, gold has less traction than a gray and a little more wear.
Silver - Duro 45-50; Firm compound for high bite carpet tracks
White - Duro 30-35; Medium/soft compound, recommended for mostly carpet tracks. Can be used on asphalt but wears alot on asphalt.
Gray - Duro 35-40; Medium compound recommended for mostly carpet tracks but also used on asphalt.
Gray/Silver - Dual compound-silver on outside of gray. Medium-firm for carpet tracks. This is a good stock right front tire.
Pink - Duro 30-35; Soft compound recommended for carpet and aspalt racing. Low wear/longer lasting characteristics.
Double Pink - Duro 35-40; Medium compound recommended for carpet and aspalt racing. This is equivilant to Jaco pink. Low wear/longer lasting characteristics.
Purple - Duro 38-43; BSR developed their own mix of select sheets and seam positioning for our purple. BSR's single purple is different than others. If you want a purple similar to Jaco use Our Double purple. Medium/firm compound recommended for carpet and aspalt racing. Low wear/ longer lasting characteristics.
Purple/Orange - Dual compound tire for carpet tracks. Helps prevent traction roll.
Double Purple - Duro 45-50; Firm compound recommended on high traction asphalt and carpet tracks. Equivilant to Jaco purple. Low wear/longer lasting characteristics.
Double Purple/Orange - Dual compound tire for high traction carpet tracks. Helps prevent traction roll.
Double Purple/Blue - Dual compound tire for high traction carpet tracks. Helps prevent traction roll.
Red - Firm compound recommended on

BLACK 40-45 awesome right side tire on flat carpet tracks. Works well for left front on banked. good right rear on high bite tracks in stock..

Wonder how well vintage NOS foam donuts will hold up, putting them to use after all of these years. Looking for asphalt donuts.


Places I've found that still sell new foam donuts.
https://www.windtunnelracingproducts.com/index.php?cPath=42_21
https://gp-speedtires.de/
https://tmrcracing.com/1-500-donuts/

[GreenBar0n]

I have (2) old Bolink RC10 foam sets that measure 1.7" in diameter. Just the widths and the tire OD's are different.

[GreenBar0n]

Went with these for the front.




For the Rear, TRC for RC10, Green Dot.




Probably try to find an old tire cutter, or make one, to trim these to the right widths, and ODs.

Will use 3M weather strip glue to mount these.

[GreenBar0n]

Scale is difficult to tell in pictures, got a front set of 1:12 tires accidentally. For $10 it was another lesson learned. May have somewhere to put those at some point.


The TRC rear tires are nearly perfect for both front and rears, with 1.7" ID, and 1.5" wide.


Going to try again for front tires, 1.7" ID is the most important in this case.

[morrisey0]

I have (2) old Bolink RC10 foam sets that measure 1.7" in diameter. Just the widths and the tire OD's are different.
[

The donuts are cut and trued to match desired width and diameter.

1:10 pan car wheels are generally 1.7" or 2.0", with widths varying. 1:12 are usually 1.4".

The dots are describing shore of the foam, so nothing to do with the wheels.

Tire (or donut) cutters are called tire truers. There are plenty of them out there used, but you have to search for the deals. Then you may need different hubs to fit different wheels, but if you are just doing a few random wheels here and there, you can usually rig up some sort of washers / bearings / bushings / etc to get a wheel to hold for long enough.

You can also use the truer to narrow plastic wheels. It is just a super mini lathe.

[GreenBar0n]

I have (2) old Bolink RC10 foam sets that measure 1.7" in diameter. Just the widths and the tire OD's are different.
[

The donuts are cut and trued to match desired width and diameter.

1:10 pan car wheels are generally 1.7" or 2.0", with widths varying. 1:12 are usually 1.4".

The dots are describing shore of the foam, so nothing to do with the wheels.

Tire (or donut) cutters are called tire truers. There are plenty of them out there used, but you have to search for the deals. Then you may need different hubs to fit different wheels, but if you are just doing a few random wheels here and there, you can usually rig up some sort of washers / bearings / bushings / etc to get a wheel to hold for long enough.

You can also use the truer to narrow plastic wheels. It is just a super mini lathe.

Thanks for that! That's what I was thinking too, I don't see myself using a $400 truer often enough, or even the $200 one, was thinking buy the arbor for 1/10 wheels, from CRC I think it was, and then use a bench grinder, or another motor to adapt to it. Have a flux welder if I need to get cheap and weird with this.

This car will be strictly asphalt, so I wanted to be sure to get the right color dots for the right mfg. donuts, and intended use. The TRC green dots are perfect, seem really close to what's on the Bolink rims currently.

Thanks again for the knowledge, a lot of that seems lost to time.

[GreenBar0n]

Following up on this thread. Both donut sets I bought, shown above, didn't fit the 1.7" wheels I ordered.

Turns out Pro-Line Jaco 2202 green donuts were the perfect fit and composition for the rear wheels. Ordered the Pink Jaco's for the front, for asphalt only.


The Jaco donuts are rough cut, and must be trued.

Got the Contact RC Tyre Truer V3 today, with the 1/10 arbor; the 3M weatherstrip adhesive arrived too.






Comes with the carbide cutting blade.


Motor spins in either direction.


Setup for the first test on some old RC10 Bolink tires.


12V 10A power supply is required, I already had this 12V 40A PSU for charging multiple 3S LiPo packs in parallel.



Here's the first cut with this truer.


Trued wheel on the left.


The Contact RC Tyre Truer V3, is really nice and solid, it has rubber feet, and no vibration or wobble. Got it from Nitro Hobbies for $189 free 2-day shipping no tax, the 1/10 arbor was $25, to the front door both were $214.95.


A foam tire file will be here tomorrow, also made by Contact RC (Schumacher Racing), that will round the edges of the tires, and smooth them out overall.