1 3/8" - 1 3/4" - etc?

Discussion in 'BIKE TALK' started by Road Master, Apr 28, 2012.

  1. Road Master

    Road Master

    Rating - 100%
    1   0   0

    Joined:
    May 12, 2009
    Messages:
    1,709
    Location:
    Indianapolis, Indiana
    I've got a Hercules 3 speed I want to rat out some and I've been wondering if a 1 3/4" S-7 size tire will fit on the English Bike rim designed for the 1 3/8" tire? And are there any wider tires that would fit on the English rim? Thanks!
  2. ratina

    ratina

    0   0   0

    Joined:
    Oct 20, 2007
    Messages:
    4,162
    Location:
    Lombard IL
    I don't think it will fit
  3. expjawa

    expjawa

    Rating - 100%
    1   0   0

    Joined:
    Mar 25, 2011
    Messages:
    1,308
    Location:
    Rochester, NY
    Definately will not fit. The S-7 has a bead diameter of 571 mm, the British roadster tire is (most likely) 590 mm. No matter how much you try (or curse), you won't be able to force the tire that's 3/4" smaller in diameter over the rim of the bigger wheel. It's like trying to put 14" car tires on a 15" wheel. The 590 size is, however, the same as a 650A tire. You might be able to find something that fits that's wider that way, but I wouldn't hold your breath. You're best bet is to actually change wheel diameters in order to use a wider size.
  4. DaBigKahuna

    DaBigKahuna

    0   0   0

    Joined:
    Jan 22, 2012
    Messages:
    156
    Location:
    Disneyland, CA
    Taking this a step further, is there anyplace that has a reference that compares the different sizes both in rim diameter and overall tire diameter etc?
  5. expjawa

    expjawa

    Rating - 100%
    1   0   0

    Joined:
    Mar 25, 2011
    Messages:
    1,308
    Location:
    Rochester, NY
    I'm not aware of one. Sheldon Brown's site breaks down the size matrix pretty well, but I don't think it has anything that ties it to width and overall size.

    Overall diameter is a factor of width. Even though, for example, a 26x2.3, 26x2.125, 26x1.95 and 26x1.75 all fit the same 599 mm rim, their widths are obviously different. Their outside diameter is different too, since the tire is more or less a balloon with a round cross section, generally, and it's height on the rim is roughly equal to how wide it is, within reason. Rim width will influence the outcome; a wider rim will make a wider, but shorter cross section, while a narrower on will lead to a narrower contact patch and taller tire. Just like on a car tire/wheel.

    I've got a spread sheet that I created that has a row for each major rim diameter, lets you input a tire width, and in turn gives you the approximate overall diameter. It also calculates speed of that tire for a given crank cadence, with that and gear numbers you input. I'm sure someone could clean it up and make it so you can pull down a rim diameter and it'll calculate the rest and display only the pertanent information, but I like having all the sizes layed out so I can see them. Anyway, if you PM me your email, I can send it to you. The offer's open to anyone that might be interested. This sort of thing out to be posted where people can use it.
  6. deorman

    deorman

    Rating - 100%
    1   0   0

    Joined:
    Apr 20, 2009
    Messages:
    8,353
    Location:
    Fairfax, VA
  7. hubgearfreak

    hubgearfreak

    0   0   0

    Joined:
    May 19, 2008
    Messages:
    271
    Location:
    lincoln, england
  8. expjawa

    expjawa

    Rating - 100%
    1   0   0

    Joined:
    Mar 25, 2011
    Messages:
    1,308
    Location:
    Rochester, NY
    Schwalbe is somewhat less common here, but there are some folks that use them frequently. I haven't come across that size yet, I'll have to keep a lookout for it. It should be good for 1/2 to 5/8" more in the tire diameter.
  9. Bicycle808

    Bicycle808

    Rating - 100%
    3   0   0

    Joined:
    Feb 19, 2011
    Messages:
    2,106
    Location:
    NJ USA
    you can buy schwalbes direct at http://www.schwalbetires.com/ You can sometimes find better prices elsewhere online, and they are sometimes "out" of a particular tire in a particular size, but they are all there.

    I've been extremely pleased with every schwalbe I've ever run. (Marathon plus, delta cruiser, fat franks, prolly a few others i cannot recall right now)

    -rob

Share This Page