Re: [RBW] Re: anyone know how to figure out Tire Radius/rim radius?

[Joel Stern]

Thanks to all, got it, did it



On Sat, Jul 18, 2020 at 7:34 PM Nick Payne  wrote:

> Stand the wheel upright and measure the distance from the floor to the
> centre of the axle...
>
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[RBW] Re: anyone know how to figure out Tire Radius/rim radius?

[Nick Payne]

Stand the wheel upright and measure the distance from the floor to the 
centre of the axle...

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Re: [RBW] Re: anyone know how to figure out Tire Radius/rim radius?

[Joel Stern]

Thanks Mathew, that is very cool.

On Sat, Jul 18, 2020 at 4:41 PM Matthew P 
wrote:

> https://bikecounterculture.com/2017/08/17/bike-wheel-diameter-calculator/
>
> mouse over the points
>
>
>
> On Saturday, July 18, 2020 at 1:35:12 PM UTC-7, Joel Stern wrote:
>>
>> Thanks Benz.
>>
>> On Sat, Jul 18, 2020 at 4:19 PM Benz Ouyang, Sunnyvale, CA <
>> benzo...@gmail.com> wrote:
>>
>>> On Saturday, July 18, 2020 at 1:00:50 PM UTC-7, Ted Durant wrote:
>>>
>>>
 The old Avocet Cyclometer prescribed method: Set the front wheel so the
 valve stem is at the very bottom and mark a line on the ground at the
 center of the tire contact patch, where the valve stem is. Ride the bike
 forward in a straight line one revolution of the front wheel, and mark
 another line where the center of the contact patch (and the valve stem) now
 are. Measure the distance between the two marks. Divide that distance by
 2*Pi, and that's your radius. (For more accuracy, repeat that measurement
 several times and take the average.). It's possible to put a chalk line on
 your tire and do this yourself, without help.

>>>
>>> A trick to Ted's method is to mark the tire with a thin line of chalk,
>>> so the ground will be marked by the chalk as the tire rolls over the mark.
>>> Also, your error will be lower if you do two or more revolutions of the
>>> wheel instead of one, and lower the tire pressure such that it approximates
>>> the sidewall droop when a nominal load is applied, but that's bordering on
>>> OCD.
>>>
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>>> 
>>> .
>>>
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Re: [RBW] Re: anyone know how to figure out Tire Radius/rim radius?

[Matthew P]

https://bikecounterculture.com/2017/08/17/bike-wheel-diameter-calculator/

mouse over the points



On Saturday, July 18, 2020 at 1:35:12 PM UTC-7, Joel Stern wrote:
>
> Thanks Benz. 
>
> On Sat, Jul 18, 2020 at 4:19 PM Benz Ouyang, Sunnyvale, CA <
> benzo...@gmail.com > wrote:
>
>> On Saturday, July 18, 2020 at 1:00:50 PM UTC-7, Ted Durant wrote:
>>  
>>
>>> The old Avocet Cyclometer prescribed method: Set the front wheel so the 
>>> valve stem is at the very bottom and mark a line on the ground at the 
>>> center of the tire contact patch, where the valve stem is. Ride the bike 
>>> forward in a straight line one revolution of the front wheel, and mark 
>>> another line where the center of the contact patch (and the valve stem) now 
>>> are. Measure the distance between the two marks. Divide that distance by 
>>> 2*Pi, and that's your radius. (For more accuracy, repeat that measurement 
>>> several times and take the average.). It's possible to put a chalk line on 
>>> your tire and do this yourself, without help.
>>>
>>
>> A trick to Ted's method is to mark the tire with a thin line of chalk, so 
>> the ground will be marked by the chalk as the tire rolls over the mark. 
>> Also, your error will be lower if you do two or more revolutions of the 
>> wheel instead of one, and lower the tire pressure such that it approximates 
>> the sidewall droop when a nominal load is applied, but that's bordering on 
>> OCD.
>>
>> -- 
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>> https://groups.google.com/d/msgid/rbw-owners-bunch/db21ebaf-46b0-4578-8058-68344abf4e8bo%40googlegroups.com
>>  
>> 
>> .
>>
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Re: [RBW] Re: anyone know how to figure out Tire Radius/rim radius?

[Joel Stern]

Thanks Benz.

On Sat, Jul 18, 2020 at 4:19 PM Benz Ouyang, Sunnyvale, CA <
benzouy...@gmail.com> wrote:

> On Saturday, July 18, 2020 at 1:00:50 PM UTC-7, Ted Durant wrote:
>
>
>> The old Avocet Cyclometer prescribed method: Set the front wheel so the
>> valve stem is at the very bottom and mark a line on the ground at the
>> center of the tire contact patch, where the valve stem is. Ride the bike
>> forward in a straight line one revolution of the front wheel, and mark
>> another line where the center of the contact patch (and the valve stem) now
>> are. Measure the distance between the two marks. Divide that distance by
>> 2*Pi, and that's your radius. (For more accuracy, repeat that measurement
>> several times and take the average.). It's possible to put a chalk line on
>> your tire and do this yourself, without help.
>>
>
> A trick to Ted's method is to mark the tire with a thin line of chalk, so
> the ground will be marked by the chalk as the tire rolls over the mark.
> Also, your error will be lower if you do two or more revolutions of the
> wheel instead of one, and lower the tire pressure such that it approximates
> the sidewall droop when a nominal load is applied, but that's bordering on
> OCD.
>
> --
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> .
>
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[RBW] Re: anyone know how to figure out Tire Radius/rim radius?

[Benz Ouyang, Sunnyvale, CA]

On Saturday, July 18, 2020 at 1:00:50 PM UTC-7, Ted Durant wrote:
 

> The old Avocet Cyclometer prescribed method: Set the front wheel so the 
> valve stem is at the very bottom and mark a line on the ground at the 
> center of the tire contact patch, where the valve stem is. Ride the bike 
> forward in a straight line one revolution of the front wheel, and mark 
> another line where the center of the contact patch (and the valve stem) now 
> are. Measure the distance between the two marks. Divide that distance by 
> 2*Pi, and that's your radius. (For more accuracy, repeat that measurement 
> several times and take the average.). It's possible to put a chalk line on 
> your tire and do this yourself, without help.
>

A trick to Ted's method is to mark the tire with a thin line of chalk, so 
the ground will be marked by the chalk as the tire rolls over the mark. 
Also, your error will be lower if you do two or more revolutions of the 
wheel instead of one, and lower the tire pressure such that it approximates 
the sidewall droop when a nominal load is applied, but that's bordering on 
OCD.

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Re: [RBW] Re: anyone know how to figure out Tire Radius/rim radius?

[Joel Stern]

Thanks Ted.

On Sat, Jul 18, 2020 at 4:00 PM Ted Durant  wrote:

>
> On Wednesday, July 15, 2020 at 6:21:55 PM UTC-5 Joel Stern wrote:
>
>> I was asked to get my tire radius and I have no cluehow to do it.
>>
>>
> Jason gave the straight math version from the rim and tire sizes, which is
> fine for most purposes.
>
> If you want to get it more precisely, here are two approaches. For both of
> them, if you want it accurate for when you are on the bike, you'll want
> some help. Note that the results are tire pressure dependent.
>
> With the bike as close to perpendicular to the ground as you can make it,
> measure the distance from the ground at the center of the tire contact
> patch to the center of the axle. Measure both sides several times and take
> the average of all the measurements (throwing out any oddball outliers if
> you have them).
>
> The old Avocet Cyclometer prescribed method: Set the front wheel so the
> valve stem is at the very bottom and mark a line on the ground at the
> center of the tire contact patch, where the valve stem is. Ride the bike
> forward in a straight line one revolution of the front wheel, and mark
> another line where the center of the contact patch (and the valve stem) now
> are. Measure the distance between the two marks. Divide that distance by
> 2*Pi, and that's your radius. (For more accuracy, repeat that measurement
> several times and take the average.). It's possible to put a chalk line on
> your tire and do this yourself, without help.
>
>
> --
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> 
> .
>
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[RBW] Re: anyone know how to figure out Tire Radius/rim radius?

[Ted Durant]

On Wednesday, July 15, 2020 at 6:21:55 PM UTC-5 Joel Stern wrote:

> I was asked to get my tire radius and I have no cluehow to do it.
>
>
Jason gave the straight math version from the rim and tire sizes, which is 
fine for most purposes.

If you want to get it more precisely, here are two approaches. For both of 
them, if you want it accurate for when you are on the bike, you'll want 
some help. Note that the results are tire pressure dependent.

With the bike as close to perpendicular to the ground as you can make it, 
measure the distance from the ground at the center of the tire contact 
patch to the center of the axle. Measure both sides several times and take 
the average of all the measurements (throwing out any oddball outliers if 
you have them).

The old Avocet Cyclometer prescribed method: Set the front wheel so the 
valve stem is at the very bottom and mark a line on the ground at the 
center of the tire contact patch, where the valve stem is. Ride the bike 
forward in a straight line one revolution of the front wheel, and mark 
another line where the center of the contact patch (and the valve stem) now 
are. Measure the distance between the two marks. Divide that distance by 
2*Pi, and that's your radius. (For more accuracy, repeat that measurement 
several times and take the average.). It's possible to put a chalk line on 
your tire and do this yourself, without help.


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Re: [RBW] Re: anyone know how to figure out Tire Radius/rim radius?

[Joel Stern]

Thanks Jason.

On Wed, Jul 15, 2020 at 7:54 PM Jason Fuller  wrote:

> I go with this simple formula, which may not be exactly right but it's
> close I think, and good for comparing one size to another.
>
> 26" = 559mm
> 650B = 584mm
> 700c = 622mm
>
> Tire outside diameter = rim diameter + (2 x tire diameter)
>
> ie 650b x 42 would be 584 + 42 + 42 = 668mm -> your radius is therefore
> half that, 334mm
>
> I think this is accurate enough for whomever's asking, but if you have the
> bike with the wheels and you can just measure, just measure ground to the
> top of the tire and divide by two
>
>
> On Wednesday, 15 July 2020 at 16:21:55 UTC-7 Joel Stern wrote:
>
>> I was asked to get my tire radius and I have no cluehow to do it.
>>
>> I am riding the 42mm Baby Shoe Pass
>>
>> I have them on a Velocity Synergy rim, this are the specs. I am running
>> the rear at 40psi and the front at about 37psi.   Any help will be
>> appreciated.
>>
>> Thanks, Joel
>>
>> At 23mm wide, with eyelets and a low profile, it's the perfect rim for
>> all those times you want to use a little wider tire. Use it for your 29'er
>> or your commuter. The possibilities are endless.
>> Item Specifications
>> Color Silver
>> Weight 584g
>> Width 23mm
>> Intended Use Road
>> Hub Drilling 32spokes
>> Brake Compatibility Rim Brake
>> Valve Presta
>> ISO Diameter 584 / 650b / 27.5"
>> Valve Length Short 32-40mm
>> Wheel Size 650b
>> Tire Type Clincher
>> Rim Center Offset 0mm
>> Rim Material Alloy
>> Brake Track Non-Machined
>> Defined Color Silver
>> Internal Rim Width 17mm
>>
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> .
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[RBW] Re: anyone know how to figure out Tire Radius/rim radius?

[Jason Fuller]

I go with this simple formula, which may not be exactly right but it's 
close I think, and good for comparing one size to another. 

26" = 559mm 
650B = 584mm 
700c = 622mm 

Tire outside diameter = rim diameter + (2 x tire diameter)

ie 650b x 42 would be 584 + 42 + 42 = 668mm -> your radius is therefore 
half that, 334mm

I think this is accurate enough for whomever's asking, but if you have the 
bike with the wheels and you can just measure, just measure ground to the 
top of the tire and divide by two


On Wednesday, 15 July 2020 at 16:21:55 UTC-7 Joel Stern wrote:

> I was asked to get my tire radius and I have no cluehow to do it.
>
> I am riding the 42mm Baby Shoe Pass
>
> I have them on a Velocity Synergy rim, this are the specs. I am running 
> the rear at 40psi and the front at about 37psi.   Any help will be 
> appreciated.
>
> Thanks, Joel
>
> At 23mm wide, with eyelets and a low profile, it's the perfect rim for all 
> those times you want to use a little wider tire. Use it for your 29'er or 
> your commuter. The possibilities are endless.
> Item Specifications
> Color Silver
> Weight 584g
> Width 23mm
> Intended Use Road
> Hub Drilling 32spokes
> Brake Compatibility Rim Brake
> Valve Presta
> ISO Diameter 584 / 650b / 27.5"
> Valve Length Short 32-40mm
> Wheel Size 650b
> Tire Type Clincher
> Rim Center Offset 0mm
> Rim Material Alloy
> Brake Track Non-Machined
> Defined Color Silver
> Internal Rim Width 17mm
>

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