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tire sizes
Turning the place into a DIY shop was the best
thing I ever did! Surprisingly, as it was never "closed" and there were always tons of goofballs working on their wierd projects. But now, the enthusiasm and atmosphere is much better! Or maybe I'm reading into this? Well, now my next idea is to print small posters which will illustrate key aspects. Here is one image [1] I found on the net explaining the tire size systems. 1) Anyone wants to add anything to it? 2) Of the systems I prefer the ISO (ETRTO), I understand the old English inch system looking on a tire, and the French system I understand/"remember" looking on that image... :) But wasn't there yet another system that was similar in style to the French system on the image? Only this was super-confusing because during the years the same designation actually took on different meanings? 3) I'll put a small textbox onto that image before I print it saying "beware of the drive" (rotation inclination) and perhaps "put the size label by the valve". Any other time-tested wisdom? Just keep it short and simple :) [1] http://user.it.uu.se/~embe8573/bike/tire-size.png -- underground experts united http://user.it.uu.se/~embe8573 |
tire sizes
Today there was a bicycle trailer and
I examined the wheels. The tires were Nokia, made in Finland, 24x2. But there was also another marking: 2 - 19 3/4 Anyone knows what that means? -- underground experts united http://user.it.uu.se/~embe8573 |
tire sizes
Emanuel Berg wrote:
Today there was a bicycle trailer and I examined the wheels. The tires were Nokia, made in Finland, 24x2. But there was also another marking: 2 - 19 3/4 Anyone knows what that means? According to this site [1] (in Swedish) 2 - 19 3/4 (24x2) is 50-507 OK, so 2" = 50.8mm ~= 50mm so that checks out. If 19 3/4 is the inner diameter in inches then that sort of checks out as that is equal to 501.65 mm. Perhaps that is an old tire size and today 507 is the closest? Difference is only ~5 mm. [1] http://www.bytcykelslang.nu/dackstorlek/ -- underground experts united http://user.it.uu.se/~embe8573 |
tire sizes
On 01/07/2018 01:21 AM, Emanuel Berg wrote:
Turning the place into a DIY shop was the best thing I ever did! Surprisingly, as it was never "closed" and there were always tons of goofballs working on their wierd projects. But now, the enthusiasm and atmosphere is much better! Or maybe I'm reading into this? Well, now my next idea is to print small posters which will illustrate key aspects. Threads. I *always* have to do a double check on which threads are LH/RH wrt to pedals/bottom brackets. You probably have to run up you're own poster, but text would be fine. It'd save a lot of jammed BBs imho. |
tire sizes
On 1/7/2018 1:58 AM, Emanuel Berg wrote:
Emanuel Berg wrote: Today there was a bicycle trailer and I examined the wheels. The tires were Nokia, made in Finland, 24x2. But there was also another marking: 2 - 19 3/4 Anyone knows what that means? According to this site [1] (in Swedish) 2 - 19 3/4 (24x2) is 50-507 OK, so 2" = 50.8mm ~= 50mm so that checks out. If 19 3/4 is the inner diameter in inches then that sort of checks out as that is equal to 501.65 mm. Perhaps that is an old tire size and today 507 is the closest? Difference is only ~5 mm. FWIW, I've found the hard way that just a few millimeters difference in bead seat diameter means things won't work at all. [1] http://www.bytcykelslang.nu/dackstorlek/ There are also these web pages: http://www.sheldonbrown.com/tire-sizing.html and http://www.sheldonbrown.com/cribsheet-tires.html I've found them to be handy. -- - Frank Krygowski |
tire sizes
Frank Krygowski wrote:
FWIW, I've found the hard way that just a few millimeters difference in bead seat diameter means things won't work at all. OK, it'll be interesting to find out... There are also these web pages: http://www.sheldonbrown.com/tire-sizing.html and http://www.sheldonbrown.com/cribsheet-tires.html I've found them to be handy. Great, thanks. -- underground experts united http://user.it.uu.se/~embe8573 |
tire sizes
Tosspot wrote:
Turning the place into a DIY shop was the best thing I ever did! Surprisingly, as it was never "closed" and there were always tons of goofballs working on their wierd projects. But now, the enthusiasm and atmosphere is much better! Or maybe I'm reading into this? Well, now my next idea is to print small posters which will illustrate key aspects. Threads. I *always* have to do a double check on which threads are LH/RH wrt to pedals/bottom brackets. You probably have to run up you're own poster, but text would be fine. It'd save a lot of jammed BBs imho. Does that differ on road bikes? Because what I remember it is always the same? LH on the left side pedal, LH on the BB nut/ring which is also on the left side, and the right pedal RH as per usual? Put the bike upside down, string/block the crank, put the wrench vertically facing up, pull against the front wheel with the wrench in a pipe - same on both pedals? Also one can think of the pedals, to disassemble (remove), pull the way you don't pedal when riding the bike. I heard there is an English version of this (which is supposedly French) and on the English, everything is RH. As for me, so far I have only seen the above (French) scenario... -- underground experts united http://user.it.uu.se/~embe8573 |
tire sizes
What does the letter "B" denote in the French
tire size system? E.g., this tire 56-584 27.5x2.20 650-56B ? -- underground experts united http://user.it.uu.se/~embe8573 |
tire sizes
Today there was a bike with the following
configuration WRT tires: ISO (ETRTO) England France -------------------------------------------------- front 56-584 27.5 x 2.20 650-56B rear 26 x 1.5 x 2 -------------------------------------------------- diff 1.5 .20 diff (mm) 38.1 5.08 This is pushing it, right? Besides, even so, better the other way around, right? -- underground experts united http://user.it.uu.se/~embe8573 |
tire sizes
On 1/9/2018 3:01 AM, Emanuel Berg wrote:
What does the letter "B" denote in the French tire size system? E.g., this tire 56-584 27.5x2.20 650-56B ? B= Second revision. '700' started out at 642mm (historically measured like wagon wheels at the very outside diameter, 700mm). As roads improved and tires narrowed, a new smaller lighter version of 700 at 635mm appeared so the 642mm became "700A" and the new one "700B". (Since everyone just made things up to suit their need/desire, there were two 700B, both at 1995mm=635mm and 1992mm=634mm) Progress being inscrutable and subjective, a later revision gave us 622mm, the still current 700C. There was a short lived 587mm 700D, smaller yet, which failed the popularity contest (pass/fail scoring) in the 1980s. Lest you think that we moderns are more rational or smarter than The Ancients, please note that your example of 650B was known as a 26" size (26 x 1-3/4) for a hundred years and nearly died out before being rebranded as 'twenty seven and a half' because it's in the middle of the 26" tire range and smaller than 27 inches. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
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