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#1




rim  tire?
How do I measure a rim in order to find out
what tire (clincher) will fit? Both practically (how to get the size) and then how to convert it into suitable tire designations/dimensions?  underground experts united http://user.it.uu.se/~embe8573 
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#2




rim  tire?
On 6/29/2018 5:04 AM, Emanuel Berg wrote:
How do I measure a rim in order to find out what tire (clincher) will fit? Both practically (how to get the size) and then how to convert it into suitable tire designations/dimensions? If there are no markings and no tire is fitted, you can measure the outside diameter minus (depth from lip to tire seat x2) /2 which give you the effective radius from which to solve for circumference. 584mm=F9, 650B 590=EA3 597=EA1 622=700C 630=K2, 27 635=F4 and so on.  Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 
#3




rim  tire?
AMuzi wrote:
How do I measure a rim in order to find out what tire (clincher) will fit? Both practically (how to get the size) and then how to convert it into suitable tire designations/dimensions? If there are no markings and no tire is fitted, Right, that's the situation for a stack of rims... you can measure the outside diameter minus (depth from lip to tire seat x2) /2 which give you the effective radius from which to solve for circumference. Great, you have a trick for getting the OD, because of the rims being bulged at the center obstructing measure tape, ruler, or a folding rule? Put it against a wall and make a mark? 584mm=F9, 650B 590=EA3 597=EA1 622=700C 630=K2, 27 635=F4 and so on. also starring: 590 = 650A 635 = 700B But what are F9, EA3, EA1, K2, and F4?  underground experts united http://user.it.uu.se/~embe8573 
#4




rim  tire?
Emanuel Berg wrote:
:AMuzi wrote: : How do I measure a rim in order to find out : what tire (clincher) will fit? : : Both practically (how to get the size) and : then how to convert it into suitable tire : designations/dimensions? : : : If there are no markings and no tire is : fitted, :Right, that's the situation for a stack of :rims... : you can measure the outside diameter minus : (depth from lip to tire seat x2) /2 which give : you the effective radius from which to solve : for circumference. :Great, you have a trick for getting the OD, :because of the rims being bulged at the center bstructing measure tape, ruler, or a :folding rule? Put it against a wall and make :a mark? if you ahve a stack of them, put the ruller on the wall. : 584mm=F9, 650B : 590=EA3 : 597=EA1 : 622=700C : 630=K2, 27 : 635=F4 and so on. :also starring: : 590 = 650A : 635 = 700B :But what are F9, EA3, EA1, K2, and F4? rim sizes. google 'em.  sig 39 
#5




rim  tire?
On 6/29/2018 6:04 AM, Emanuel Berg wrote:
How do I measure a rim in order to find out what tire (clincher) will fit? Both practically (how to get the size) and then how to convert it into suitable tire designations/dimensions? Here's an article on how to measure rims, assuming no markings. https://www.sheldonbrown.com/rimsizing.html   Frank Krygowski 
#6




rim  tire?
David Scheidt wrote:
But what are F9, EA3, EA1, K2, and F4? rim sizes. google 'em. Got any hits in particular you'd like to share?  underground experts united http://user.it.uu.se/~embe8573 
#7




rim  tire?
Frank Krygowski wrote:
Here's an article on how to measure rims, assuming no markings. https://www.sheldonbrown.com/rimsizing.html Great, thanks!  underground experts united http://user.it.uu.se/~embe8573 
#8




rim  tire?
Frank Krygowski wrote:
Here's an article on how to measure rims, assuming no markings. https://www.sheldonbrown.com/rimsizing.html What does this mean: ... then dividing by pi (3.142) the diameter is 518.5mm. 16mm additional (twice the depth of the well) gives 534 mm, but the bead seat diameter is be about 10 mm smaller, and this is a 520 mm rim. Why not stop at 518.5mm?  underground experts united http://user.it.uu.se/~embe8573 
#9




rim  tire?
On Saturday, June 30, 2018 at 12:43:30 PM UTC4, Emanuel Berg wrote:
Frank Krygowski wrote: Here's an article on how to measure rims, assuming no markings. https://www.sheldonbrown.com/rimsizing.html What does this mean: ... then dividing by pi (3.142) the diameter is 518.5mm. 16mm additional (twice the depth of the well) gives 534 mm, but the bead seat diameter is be about 10 mm smaller, and this is a 520 mm rim. Why not stop at 518.5mm? He used the tape to measure the outside diameter of the inside bottom (AKA inner well) of the rim. but you want the bead seat diameter instead  the diameter of the surfaces the tires bead sit on. The well is deeper (or smaller diameter) than the bead seat. If it were not, you wouldn't be able to get the tire mounted.  Frank Krygowski 
#10




rim  tire?
Frank Krygowski wrote:
Why not stop at 518.5mm? He used the tape to measure the outside diameter of the inside bottom (AKA inner well) of the rim. but you want the bead seat diameter instead  the diameter of the surfaces the tires bead sit on. The well is deeper (or smaller diameter) than the bead seat. If it were not, you wouldn't be able to get the tire mounted. Yes, what I mean is, don't you get the correct result anyway by starting from the inner well and then move up to the closest tire? Specifically, the issue is 609, 622, 630, and 635 rims. 635 rims are the oldschool Vrims with spokes at a center line. The rear wheel comes with preTorpedo hubs, like the Swedish Novo and most likely other brands for other countries. So you can identify the 635s by that. 630 are often thin, 32, as in 32630 or 27x11/4, the oldschool road bike standard (which is great by the way). Remain 622 (the mostcommon 28) and the "wierd Dutch size" 609 which is a 27. (I think you can use 609 on 622 bikes with no real disadvantage, at least if you have 609 both rear and front. 635 tho you cannot have on 622 bikes as they wont fit but hit the fender and/or stays.) I found it is easier solve the rim size issue like this. Whenever a tire is removed from a rim, take the rim to a wall, put it against it and make a mark with the size on the just removed tire. Repeat every time there is a rim/tire that isn't already on the wall.  underground experts united http://user.it.uu.se/~embe8573 

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