foam tyres

[cheapskate]

can anybody tell me what the ratings mean on foam tyres?
is it the lower the number the better the grip of the foam

Mal

[FastWheels]

http://www.teamcrc.com/crc/modules.p...article&sid=27


Jaco Ratings

Description

Green (medium) standard
Pink (med-soft) low wear
Purple (med-firm) low wear
Gray (med) high bite carpet
Black (firm) high bite carpet

Green (medium) standard
Aqua (med-soft) standard
Pink (med-soft) low wear high traction
Purple (firm) ultra-low wear high traction
White (med) high bite carpet
Gray (med) high bite carpet

Corally Tyre info

http://www.12thscale.info/content/view/13/2/

[Mark Stiles]

A lower shore rating means a softer tyre, although the construction and type of foam can also vary depending on rubber content and other factors.

1/12th scale tyres tend to be graded on a colour scale as described above. The scales vary a bit between manufacturers, so it's usually best to pick a brand and stick with it...

[Mad-Wolfie]

I'm tempted to run xceed tyres, because you get 3 choices.. soft, medium & hard. Much easier than the faff of colour codes

[Chequered Flag Racing]

Originally Posted by Mad-Wolfie

I'm tempted to run xceed tyres, because you get 3 choices.. soft, medium & hard. Much easier than the faff of colour codes

good choice, I love them on my 12th

[SlowOne]

The numbers on the tyres is the Shore rating, which is a guide to hardness. Generally speaking, the harder the tyre the less grip you get, but...

...then we have to consider the type of rubber. Yellow and Pink rears have roughly the same Shore number, but they are used in very different situations. Usually, where one works, the other won't. This guide on the CRC site gives you all the differences worth knowing, but take the usage guide with a pinch of salt.

http://www.teamcrc.com/crc/modules.p...article&sid=27

As a general rule, with today's cars, tracks and additive in the UK, we tend to use pink, yellow or magenta rears, and double-pink or magenta fronts. CRC, BSR, Mobgums (Jaco on a grey wheel), Parma (Jaco on a black wheel) or Jaco are the usual suspects and the most popular. Like Mark says, pick a make and stick to it.

I've used the Xceed tyres and found them good. They lose about -.3 seconds on a 12 second lap to the CRC or Jaco tyres, but that's a couple of missed apexes which most us could tighten up anyway on our current *cough* erratic driving styles. I have medium fronts only, and soft or medium rears. They grip well, wear well and don't go soft with the oily additives. Frankly, if you are starting out, then three sets of each rotated during the day will be an economic and competitive choice.

Find out what the regular drivers at your Club use for compounds and get those. Add other tyres as you need them. If you're at a National, come and ask people like Mark of me and we will gladly loan you tyres to try before you buy. True them down to 45mm rear, 43mm front, rotate them from side to side each run and run htem until they are too badly frayed at the edges to go on, or until they are 40mm rear and 39mm front.

The closer the stagger you have (rear diameter to front diameter) the more rotation the car will have in a corner. 2mm stagger (eg 45/43) is common, but on some cars and especially in Spec class, 1mm stagger is worth a try to get higher corner speeds. HTH

[Mark Stiles]

You may find the articles on the following page useful;

http://www.brca.org/?q=sections/subs...-articles/1144

[Sumilidon]

Could anyone recommend a rating suitable for a 1/10 touring car on carpet with a fairly heavy (old) chassis?

[Mark Stiles]

Originally Posted by Sumilidon

Could anyone recommend a rating suitable for a 1/10 touring car on carpet with a fairly heavy (old) chassis?

The guys at my local club used to run 35 shore foams. They seemed to provide ample grip with good wear rates.

1/10th scale foams are rated on a shore number scale rather than with colours, so they are easier to follow/understand.

[terry.sc]

Shore rating depends on the carpet you are racing on, our carpet is relatively low grip and 30-32 shore are popular, although there are others happily running on 35 and 37 shore tyres depending on car setup.

35 shore is a good starting point with tons of life from them, if you need more grip go softer and don't be afraid to mix and match tyres, I think I'm in the minority of using the same shore all round as most of my club members tend to use one grade harder on the front (e.g. front 32sh, rear 30sh or front 37sh, rear 35sh) to make the car more stable.

[Sumilidon]

Again sorry guys, I am really struggling with this whole wheel business.

I need wheels and tyres for a Hobbytech HT1. Currently it has schumacher yellow mini pins (24mm wide, 53 mm high?) and If I have calculated it right, a 0 offset

Any links to foam tyre & wheel combos for this size?

[terry.sc]

You can ignore worrying about wheel sizes, apart from drift cars every touring car uses wheels of exactly the same size and offset, after all why make a car that doesn't fit the industry standard wheels. The only thing to watch for is tyres made for the micro buggies, they use the same touring car wheels but the tyres are trued down to 53mm diameter. They still work fine on a tourer, you just usually have problems with ground clearance and they don't last as long.

Every touring car foam wheel/tyre combo is one of two sizes, thanks to their use on nitro cars. Electric cars use 26mm all round, nitro cars use 26mm front/30mm rear. Although usually the only thing stopping you running 30mm rears on an electric tourer is whether they will fit over the upright.

I like the Contact-RC tyres, and they have plenty of choice.
On standard white wheels
Lightweight wheels, lighter but not as durable
Black carbon reinforced wheels, stiffer and more responsive
Electric tyres, designed specifically for electric tourers on carpet
Tyres available direct from Schumacher with the above links, but available through any Schumacher stockist.

I would start with 35 or 37 shore on standard wheels to begin with, and the same tyres all round. If you need more grip replace them with 32 or 30 shore tyres. If your club allows additive use whatever most racers are using, that way you know the additive on your tyres won't react with the additive deposited on the carpet by everyone else and destroy the grip.

[Sumilidon]

Superb, thanks