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Old 02-04-2011, 06:05 PM   #1
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Default Why 63mm rubber tires?

How did rubber tires end up at 63mm? just for clearance on bumpy outdoor tracks? I wonder how a 57mm rim would perform, I think that indoors on high grip it would help the cars from being on the verge of flipping over. Its easy to see how little contact it takes to "peel" a car. Ideas?
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Old 02-04-2011, 06:14 PM   #2
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63 is that close to 2 1/2 inches it doesn't matter.

I'd say thats where the size comes from, the metric conversion and nothing more.
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Old 02-04-2011, 06:56 PM   #3
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Originally Posted by lupin_au View Post
63 is that close to 2 1/2 inches it doesn't matter.

I'd say thats where the size comes from, the metric conversion and nothing more.
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Old 02-04-2011, 10:06 PM   #4
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The point was over looked.
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Old 02-05-2011, 02:21 AM   #5
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Originally Posted by MikeXray View Post
How did rubber tires end up at 63mm? just for clearance on bumpy outdoor tracks? I wonder how a 57mm rim would perform, I think that indoors on high grip it would help the cars from being on the verge of flipping over. Its easy to see how little contact it takes to "peel" a car. Ideas?
I think you could be on too something, 57mm may be a bit drastic and with a modern tc we may struggle to get ride height, I'd say even going to something like a 60mm tire would massively help with traction rolling - though I think at the really big races such as the snowbirds etc there will always be an element of traction rolling!
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Old 02-05-2011, 02:21 AM   #6
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63 is that close to 2 1/2 inches it doesn't matter.

I'd say thats where the size comes from, the metric conversion and nothing more.
if that were true than the tire size would be 63.5mm as that is 2.500" in when you do the math. 2.5 x 25.4= 63.5mm
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Old 02-05-2011, 06:05 AM   #7
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I think you could be on too something, 57mm may be a bit drastic and with a modern tc we may struggle to get ride height, I'd say even going to something like a 60mm tire would massively help with traction rolling - though I think at the really big races such as the snowbirds etc there will always be an element of traction rolling!
I picked 57 because that is what we started foams at, if memory serves me right I think we could get down to 55.5, we could always make 4mm but a foam car was a lot stiffer and rolled a lot less, that is where I think the issue may be, rolling enough to have grip and not rubbing on the track.
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Old 02-05-2011, 06:17 AM   #8
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I picked 57 because that is what we started foams at, if memory serves me right I think we could get down to 55.5, we could always make 4mm but a foam car was a lot stiffer and rolled a lot less, that is where I think the issue may be, rolling enough to have grip and not rubbing on the track.
OR, a better option.......start running foam again
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Old 02-05-2011, 07:30 AM   #9
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well being the first TC was a Tamiya... so metric... and Tamiya is all about scale... I would think 63mm was the end result of what looked scale on a TA01...

In any case rubber tires is what it is... tune and work around the constant factor of rolling sidewalls... If we go to 57mm or smaller rubber tires it would look like we're running M-chassis wheels on a TC...

Personally I always hated that in foam tires we trued them down so much... I always started BIG at 58-59mm and drove them till they chunked bad or down to 56mm or so... The cars looked funny with a pencil line tire around the rim
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Old 02-05-2011, 07:34 AM   #10
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i think it could also be due to the suspension components like hubs ,bearings, arms requiring a certain amount of space to occupy, so thats why rims cannot be made smaller than they are now, as it is i beleive rubber tyres are already at their minimum sidewall heights.
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Old 02-05-2011, 08:35 AM   #11
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Originally Posted by MikeXray View Post
How did rubber tires end up at 63mm? just for clearance on bumpy outdoor tracks? I wonder how a 57mm rim would perform, I think that indoors on high grip it would help the cars from being on the verge of flipping over. Its easy to see how little contact it takes to "peel" a car. Ideas?
In the early days a sedan racing there was some really low profile tires...I would think about 60mm or less. The problem was they never worked that well.....Just ask anyone who ever use Proline H13 tires.... Yokomo made larger rims "inch ups" that stretched the tires and made them lower profile....the problem then was wear of the tires. I think the reason the tires are as large as they are now is because this is the size that works the best. Like you said about foams 57mm....well rubber tires work best around 63mm....other sizes have been tired but this is where we are at now.
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Old 02-05-2011, 10:18 AM   #12
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OR, a better option.......start running foam again
This
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Old 02-05-2011, 11:32 AM   #13
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OR, a better option.......start running foam again
I'm not sure why 1/10 foam died and 1/12 didn't. I like foam, 17.5 open foam would be a fun class.


The mchassis wheels are 55mm with tire, they do look silly on a touring car.
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