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RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  OS Wheel sizes question
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Author Topic: OS Wheel sizes question  (Read 704 times)

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Offline mivvi

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OS Wheel sizes question
« on: October 05, 2006, 10:42 AM »
My Araya's have 20 x 175 written on them but don't measure 1 and 3/4" wide, am I missing something here? I take it the measurement is in inches?  ???

Offline RATTY

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Re: OS Wheel sizes question
« Reply #1 on: October 05, 2006, 10:43 AM »
I think it refers to the tyre size, i stand to be corrected though :daumenhoch:
A long time ago, in a land far away!

theRuler

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Re: OS Wheel sizes question
« Reply #2 on: October 05, 2006, 10:47 AM »
bmx wheel measurement is bobbins

Frosty

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Re: OS Wheel sizes question
« Reply #3 on: October 05, 2006, 10:52 AM »
yup I agree with Ruler, you can lay a 20x 1 3/8th rim over a 20 x 1.75!

So I think that Ratty's theory is right, tyre size :daumenhoch:

Offline mivvi

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Re: OS Wheel sizes question
« Reply #4 on: October 05, 2006, 11:50 AM »
So your saying a 20x 1 3/8th rim is wider than a 20 x 1.75 rim?

Frosty

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Re: OS Wheel sizes question
« Reply #5 on: October 05, 2006, 12:02 PM »
diameter is bigger!

Sanmarcopizza

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Re: OS Wheel sizes question
« Reply #6 on: October 05, 2006, 12:16 PM »

Offline mivvi

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Re: OS Wheel sizes question
« Reply #7 on: October 05, 2006, 12:17 PM »
No Way!!! That's crazy talk????                20" is .....well....20"        or your tyres would fall off.

Anyhow, do I have an answer to: Is a 20x1 3/8 (Rim) wider or narrower than a 20x1.75 (Rim).??????

Offline Nosnod

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Re: OS Wheel sizes question
« Reply #8 on: October 05, 2006, 12:33 PM »
A 20x1 3/8 rim is narrower than a 20x1.75

However a 20x1.3/8 rim is larger in diameter than the 20x1.75 due to the 20 inches being the diameter when the tyre is on - as the 1.75 tyres are a lot deeper than a 1.3/8

I think this is right and hope it clarifies things  :buck2: :D

Frosty

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Re: OS Wheel sizes question
« Reply #9 on: October 05, 2006, 12:39 PM »
Head, nail hit it you have :daumenhoch:

Offline mivvi

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Re: OS Wheel sizes question
« Reply #10 on: October 05, 2006, 12:43 PM »
Ah, that's is now clearer. Its a crazy world of tyre sizes and I wish to never go there again.

Thank you all for your help and San for the link!  :daumenhoch:

steve

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Re: OS Wheel sizes question
« Reply #11 on: October 05, 2006, 06:05 PM »
a 20 by 1.75 rim is 406mm actually 16 inches

a 20 by 1.3/8 and a 1.1/8 is 451mm 17 and three quarter inces

a sew up is 395 -15 inches inside and 432 =17inches outside


-its all about the added tyre profile to get to 20 inches

-stcik to the etro sizes

the funny thing is, that they fit bigger wheels to mini's and micro's, which i think is hilarious
 :LolLolLolLol:

although a 20 by 1.3, is the same rolling radius -with the tyre on, as a sew up

a 406 by 28mm etro tyre is a half inch smaller

-the 400 by 25 on the new redline micro, even smaller

RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  OS Wheel sizes question
 

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