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  #1  
Old 06-25-2013, 06:31 PM
rperyon rperyon is offline
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Default Wheel & Tire Sizes? Is there a tool?

Hafa Adai Slot Car Friends,

Just wondering, is there a tool or charts available to measure the sizes of wheels and tires for HO cars? This would make life much easier.

rob
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  #2  
Old 06-25-2013, 06:38 PM
Mike11422 Mike11422 is offline
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BSRT makes a a good tire gauge.
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Old 06-25-2013, 07:50 PM
rperyon rperyon is offline
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Quote:
Originally Posted by Mike11422 View Post
BSRT makes a a good tire gauge.
Hey thanks! I'll check em out, I didn't know there was such a tool.
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  #4  
Old 06-25-2013, 10:43 PM
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NicoRosberg. NicoRosberg. is offline
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If you already have digital calipers, or can source one cheaply on ebbay, pass on the BSRT gauge and ones of that type as the calipers will give you better repeatability.

If you use a known set of tires on the wheels they are intended for, then the gauges are OK as 'checkers', but if you don't know what the tires are and/or the wheels are tall and you want the absolute size calipers are much better.



Also, they are much cheaper. The gauges can be USD 30.00, pretty steep for a flat piece of metal with some holes in. You can get the calipers for USD 10.00.
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Old 06-25-2013, 11:33 PM
rperyon rperyon is offline
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Wow, I didn't know they existed either. Thanks for the insight. I'll check them out now.

Quote:
Originally Posted by NicoRosberg. View Post
If you already have digital calipers, or can source one cheaply on ebbay, pass on the BSRT gauge and ones of that type as the calipers will give you better repeatability.

If you use a known set of tires on the wheels they are intended for, then the gauges are OK as 'checkers', but if you don't know what the tires are and/or the wheels are tall and you want the absolute size calipers are much better.



Also, they are much cheaper. The gauges can be USD 30.00, pretty steep for a flat piece of metal with some holes in. You can get the calipers for USD 10.00.
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Old 06-25-2013, 11:36 PM
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Ebbay is your best bet.

There are various way to use them on the tires, I do side-picking-up - which I can explain further if you go the caliper route....
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Old 06-26-2013, 12:28 AM
Gareth Gareth is offline
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I would say to make sure you get calipers that measure to 3 decimal places though. I bought a cheap set on ebay and they only go to two d.p. which is pointless when measuring 0.418 tyres compared to 0.422 for example.
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Old 06-26-2013, 04:38 AM
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Good point Gareth, well done sir.
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  #9  
Old 06-26-2013, 05:54 AM
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I have used micrometers, calipers and the BSRT tire gauge over the years. The BSRT tire gauge provides the best measurement accuracy, repeatability and ease of use. The micrometer is next and in a good hand can give the gauge a run for its money. The caliper is third best.
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  #10  
Old 06-26-2013, 06:08 AM
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We built or own Micrometer, I have images somewhere, and that did indeed take things to a whole different level.

I'm interested in your view of the gauge being better than the calipers. I really don't understand how you can say that. For example, if a tire/wheel OD is .418'' or 0.433'' how do you measure that with the BSRT version 'accurately', 'repeatabily' or even at all?

That is only two examples.

The other problem is remembering how much one forced a tire through last time, or how little it rattled, the impression of which can vary from user to user. That is why they are OK for checking, if you have a Supertire 434 for a Tyco wheel and fit it to those wheels you can identify said tire easily, for example. But even then there are certain tires the BSRT version cannot check under those quite specific conditions.

The $30 price tag has to be factored in too.

Last edited by NicoRosberg.; 06-26-2013 at 06:15 AM.
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  #11  
Old 06-26-2013, 07:07 AM
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Green Destiny Green Destiny is offline
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I find having the BSRT tire gauge and a set of digital calipers to be useful. The calipers i'll use to measure the hubs and the tire gauge i'll use to measure tires on the hubs. I tried using calipers to measure silicone covered sponge tires years back and never got a consistent measurement. Regarding the force issue, I took a premeasured set of tires (on hubs) and ran them through to appropriate hole on the tire gauge and got a good idea of the force and the side play for a tire at its measured size.
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  #12  
Old 06-26-2013, 07:09 AM
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I have done similar, but having to have 'a good idea' of anything shows how flawed gauges are.

I use mine as a heatsink
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  #13  
Old 06-26-2013, 07:20 AM
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Green Destiny Green Destiny is offline
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Let's hear about your "side-picking-up"
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  #14  
Old 06-26-2013, 08:22 AM
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Here is our home-made, but incredibly accurate, device.



We don't have access to it all the time, but we have used it to check the veracity of our various tests.

This isn't the side test, I don't have art of that, but you get the idea:


Last edited by NicoRosberg.; 06-26-2013 at 09:02 AM.
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  #15  
Old 06-26-2013, 11:44 AM
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SouthShoreRacing SouthShoreRacing is offline
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I use the BSRT tire guage. Most people I know use a tire gauge. The clubs I race with use the BSRT tire guage for tech. It never needs to be adjusted, never needs batteries. Works well and a go/no go tech tool.
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