Today there was a dude in his early-mid 20s
with a unicycle!

Only it didn't look like a toy or circus item
but rather a real vehicle of sorts, party
because of its huge wheel (36x2-1/4) and black,
industrial style.

The guy confirmed it was the biggest he had
seen and said it was
a German-Canadian construction.

He rode the thing like it was his native
language so probably he did it all his life.

It is also the biggest tire I ever saw so now
it is on top of my list of tires.
Interestingly, even tho supposedly German made,
the tire only had the old English industrial
designation.

(If the table looks messed up to you, check the
text file URL last.)


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ISO / ETRTO England France note
----------------------------------------------------------------------
36 x 2-1/4 German unicycle
642 700 original wagon wheel OD
635 700B B = 2nd revision
44-635 28 x 1-5/8 x 1-1/2 old-school "V rim"
40-635 28 x 1-1/2 700x38B
634 700B another 700B version
32-630 27 x 1-1/4 old RB
622 700C RB standard
47-622 28 x 1.75 x 2
47-622 28 x 1-5/8 x 1-3/4 700x45C 28x1.75
47-622 27 x 1.75 700x45C
42-622 28 x 1-5/8 700x40C
40-622 28 x 1-5/8 x 1-1/2 700x38C
37-622 28 x 1-5/8 x 1-3/8 700x35C
37-622 28 x 15/8 x 13/8 700x35C
32-622 28 x 14/8 x 10/8
32-622 28 x 1-5/8 x 1-1/4 700x32C
32-622 28 x 1-5/8 x 1-1/2 700x32C C = 700C
700x28C
700x25C
700x23C
700x20C
700x19C
37-590 26 x 1-3/8 650x35A
587 700D discontinued in 1980s
26 x 1-3/4 650B original 26
56-584 27.5 x 2.20 650x56B modern MTB 27.5
54-584 26 x 1-1/2 x 2
44-584 26 x 1-1/2 x 1-5/8
44-584 26 x 1-5/8 x 1-1/2
40-584 26 x 1-1/2 650x35B
26 x 1.5 x 2
56-559 26 x 2.10
26 x 2 trailer, 2 - 19-3/4 [1]
50-559 26 x 2.0
50-559 26 x 1.95
37-540 24 x 1-3/8 600x35A trailer, modern
37-349 16 x 1-3/8
32-349 16 x 1-1/4
37-298 14 x 1-3/8
----------------------------------------------------------------------

[1] 19-3/4" rim ~= 502 mm so BSD 559 tire won't work


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http://user.it.uu.se/~embe8573/bike/TIRE


--
underground experts united
http://user.it.uu.se/~embe8573