For any given rim there is a precise relationship between inner and outer width and it can be easily measured as exactly as one likes, but I'm not sure how consistent the relationship is across all rim types. Granted, you use what you have as do I. Understanding the distinction is important for clarity. If we are going to talk about a 24 mm rim, we should at least state whether it's an outer 24 (suited to sort of narrow tires) or an inner 24 (suited to rather wide tires). Then you'll know whether or not to apply your mental 5 mm (or whatever you think is correct) fudge factor.
I believe Schwalbe has a much more comprehensive chart on their site, based on inner width, that addresses "tire too small" and "tire too large." Sheldon was a giant, and his body of work is unsurpassed, but in some areas the industry and hobby are moving ahead. On Thu, May 6, 2010 at 6:21 PM, Michael_S <[email protected]> wrote: > Of course inner width is important, but there is a close relationship > between inner and outer widths. and most manufacturers quote outside > width only so "ya use what ya got". Sheldon's charts by the way > only address the large end of the equation. that is... how big can > you go. > > ~Mike~ > > On May 6, 3:08 pm, Ken Freeman <[email protected]> wrote: > > I believe Sheldon cautioned us to use the inner rim width to assess tire > > suitability, not the outer. > > > > > > > > > > > > On Thu, May 6, 2010 at 5:15 PM, Mitch Browne <[email protected]> > wrote: > > > It's always worthwhile to consult Sheldon Brown > > >http://www.sheldonbrown.com/tire-sizing.html > > > > > On May 6, 11:59 am, Michael_S <[email protected]> wrote: > > > > The cliffhanger is one of the widest rims around at 28mm outside > > > > width. I would not ride anything narrower than a 32mm tire on a rim > > > > that wide. Since it's only available in 26 in. rims that would equate > > > > to a 1.25 wide tire. I don't have any bikes in that size but I think > > > > there are not many roadish tires in that size. > > > > > > ~Mike~ > > > > > > On May 6, 10:57 am, doug peterson <[email protected]> wrote: > > > > > > > George: > > > > > > > You mention taking your Atlantis on a road trip. Is this a bke > tour > > > > > or are you taking the bike along with you on a vehicle trip? Think > > > > > about what you're going to use the bike for and whether you need to > > > > > ride it every day to get where you are going. Those constraints > are > > > > > important in your choice of tire. If the bike is going with you > but > > > > > just for day rides, you can go with about any tire you want. But > if > > > > > the bike is your primary mode of transportation, 28 might be a bit > > > > > narrow. > > > > > > > FWIW, I run 35mm Marathon Supremes on my Atlantis for everything > from > > > > > loaded tours to So Cal sand washes. They're absolutely perfect for > > > > > touring but perhaps a bit lacking off-road :). BTW, I have no clue > on > > > > > the tire size / rim size queston, but I'll wager that if Riv > supplied > > > > > the wheels, they could advise you on appropriate tire sizes. > > > > > > > dougP > > > > > > > On May 6, 9:42 am, Ken Freeman <[email protected]> wrote: > > > > > > > > The important numberfor the rim is the inner width, the spacing > > > between the > > > > > > inner edges of both bead hooks. To measure it the tire must be > off. > > > > > > Typically a tire shouldn't be less than maybe 8 mm wider than > this > > > number or > > > > > > more than maybe 20 mm wider - I don't know the precise numbers. > But > > > it's > > > > > > definitely based on the inner width. Few bicycle rims, if any, > have > > > inner > > > > > > widths as large as 28 mm. > > > > > > > > On Thu, May 6, 2010 at 12:08 PM, GeorgeS <[email protected]> > > > wrote: > > > > > > > I am very foggy on the relationship between rim and tire size. > My > > > > > > > Atlantis came with Velocity Cliff Hanger rims which are > > > approximately > > > > > > > 28mm wide. The tires are Big Apples. I want to put some > narrower > > > > > > > tires, perhaps Marathon Racers, on the wheels for a road trip > this > > > > > > > summer. I gather I cannot go narrower than 28. Is that the > only > > > > > > > number I should be worried about? Thanks. > > > > > > > GeorgeS > > > > > > > > > -- > > > > > > > You received this message because you are subscribed to the > Google > > > Groups > > > > > > > "RBW Owners Bunch" group. > > > > > > > To post to this group, send email to > > > [email protected]. > > > > > > > To unsubscribe from this group, send email to > > > > > > > [email protected]<rbw-owners-bunch%[email protected]> > <rbw-owners-bunch%[email protected] > ><rbw-owners-bunch%2Bunsubscrib > > > [email protected]> > > > > > > > . > > > > > > > For more options, visit this group at > > > > > > >http://groups.google.com/group/rbw-owners-bunch?hl=en. > > > > > > > > -- > > > > > > Ken Freeman > > > > > > Ann Arbor, MI USA > > > > > > > > -- > > > > > > You received this message because you are subscribed to the > Google > > > Groups "RBW Owners Bunch" group. > > > > > > To post to this group, send email to > > > [email protected]. > > > > > > To unsubscribe from this group, send email to > > > [email protected]<rbw-owners-bunch%[email protected]> > <rbw-owners-bunch%[email protected]> > > > . > > > > > > For more options, visit this group athttp:// > > > groups.google.com/group/rbw-owners-bunch?hl=en.-Hidequoted text - > > > > > > > > - Show quoted text - > > > > > > > -- > > > > > You received this message because you are subscribed to the Google > > > Groups "RBW Owners Bunch" group. > > > > > To post to this group, send email to > [email protected] > > > . > > > > > To unsubscribe from this group, send email to > > > [email protected]<rbw-owners-bunch%[email protected]> > <rbw-owners-bunch%[email protected]> > > > . > > > > > For more options, visit this group athttp:// > > > groups.google.com/group/rbw-owners-bunch?hl=en.-Hide quoted text - > > > > > > > - Show quoted text - > > > > > > -- > > > > You received this message because you are subscribed to the Google > Groups > > > "RBW Owners Bunch" group. > > > > To post to this group, send email to > [email protected]. > > > > To unsubscribe from this group, send email to > > > [email protected]<rbw-owners-bunch%[email protected]> > <rbw-owners-bunch%[email protected]> > > > . > > > > For more options, visit this group athttp:// > > > groups.google.com/group/rbw-owners-bunch?hl=en. > > > > > -- > > > You received this message because you are subscribed to the Google > Groups > > > "RBW Owners Bunch" group. > > > To post to this group, send email to [email protected] > . > > > To unsubscribe from this group, send email to > > > [email protected]<rbw-owners-bunch%[email protected]> > <rbw-owners-bunch%[email protected]> > > > . > > > For more options, visit this group at > > >http://groups.google.com/group/rbw-owners-bunch?hl=en. > > > > -- > > Ken Freeman > > Ann Arbor, MI USA > > > > -- > > You received this message because you are subscribed to the Google Groups > "RBW Owners Bunch" group. > > To post to this group, send email to [email protected]. > > To unsubscribe from this group, send email to > [email protected]<rbw-owners-bunch%[email protected]> > . > > For more options, visit this group athttp:// > groups.google.com/group/rbw-owners-bunch?hl=en.- Hide quoted text - > > > > - Show quoted text - > > -- > You received this message because you are subscribed to the Google Groups > "RBW Owners Bunch" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<rbw-owners-bunch%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/rbw-owners-bunch?hl=en. > > -- Ken Freeman Ann Arbor, MI USA -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. 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