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unicycle
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.) ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- http://user.it.uu.se/~embe8573/bike/TIRE -- underground experts united http://user.it.uu.se/~embe8573 |
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