Technical & Reference Section > Tech and Restoration

OS Wheel sizes question

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mivvi:
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:
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

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