Advertise on Bikeforums.net



User Tag List

Results 1 to 11 of 11
  1. #1
    feros ferio John E's Avatar
    Join Date
    Jul 2000
    Location
    www.ci.encinitas.ca.us
    My Bikes
    1959 Capo; 1980 Peugeot PKN-10; 1981 Bianchi; 1988 Schwinn KOM-10;
    Posts
    15,005
    Mentioned
    7 Post(s)
    Tagged
    0 Thread(s)

    28mm is 28mm, right?

    Because of sidewall deterioration, I just replaced a 700Cx28 Specialized Armadillo Turbo tyre with a Continental Ultra 2000 700Cx28. The latter is very noticeably narrower than the former, and measures just under 25mm across.

    This is not really a complaint or a question, simply an observation. It could be a problem if someone ordered an Armadillo 700Cx28 and then found it was too wide for his/her frame to accommodate.

    It is also interesting that Continental Ultra 2000s are now blackwalled, instead of gumwalled.
    "Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
    Capo [dschaw'-poe]: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger, S/N 42624
    Peugeot: 1970 UO-8, S/N 0010468
    Bianchi: 1981 Campione d'Italia, S/N 1.M9914
    Schwinn: 1988 Project KOM-10, S/N F804069

  2. #2
    JRA...
    Join Date
    Oct 2003
    Location
    philly
    My Bikes
    trek 520 & 736, DeRosa Professional, Fuji Professional, Raleigh International 3-speed, Saronni (any info people?), Humber 3-speed, Raleigh Sports, Carlton Grand Prix coming soon!
    Posts
    839
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I am very fond of panaracers, but find that their numbers seem to be inaccurate. their 32s look more like 28s, and so on. but perhaps that is due to them using a fairly oval-shaped profile to their tires.

  3. #3
    sch
    sch is offline
    Senior Member
    Join Date
    May 2003
    Location
    Birmingham. AL
    Posts
    2,595
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Tire sizes are like women's shoe and dress sizes, they are a relative guide only.
    One companies 25 is anothers 23 etc. 10% variance is reasonable. Steve

  4. #4
    Banned.
    Join Date
    Feb 2003
    Location
    Fort Wayne, Indiana
    My Bikes
    84 Trek 660 Suntour Superbe; 87 Giant Rincon Shimano XT; 07 Mercian Vincitore Campy Veloce
    Posts
    4,766
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Sch is right, none of the tire sizes correspond with different manufactures, which I think there should be some mandatory law that says they should. I was barely able to get a 28 Armadillo on the rear of my bike; I had to deflate the tire and then press the tire flat against the seat tube to squeeze it off. Even now with the Armadillo 26 on the rear, I still have to deflate the tire...but I had to do that with 20's and 23's anyway! The geometry on my bike is very tight.

  5. #5
    Senior Member Astra's Avatar
    Join Date
    Feb 2002
    Location
    My house, England
    Posts
    461
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I think Panaracer tend to be pretty on the nail, size-wise. I recently bought some Specialized Roll X Pro 2.0 for my bike and they were massive - I had to send them back because of chainstay clearance issues. I bought some Panaracer Cinder 1.95 tyres and they fit perfectly. The Specializeds were more like 2.2/2.3 size .
    Oooooh yes, one day I will rid the world of showers and the bath shall come to dominate the cleansing habits of all the human race!

  6. #6
    Evil Genius capsicum's Avatar
    Join Date
    May 2004
    Location
    Sumner, WA
    My Bikes
    '92 novara ponderosa, '74 schwinn le tour, Novara fusion, novara transfer, novara randonee(2), novara careema pro, novara bonita(2).
    Posts
    1,529
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    They sell smaller tires under larger designations(ie it says 28 but measures 25) so the can brag about howmuch lighter their tire is than the competitions. At one point this had gotten quite ridiculous with 20s being sold as 25s and so they went back to accurate nominal sizes, but it seems things have started to come full circle.
    "Data is not the plural form of annecdote."
    "yuo ned to be deadurcated"

  7. #7
    ld-cyclist prestonjb's Avatar
    Join Date
    Aug 2003
    Posts
    380
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    http://www.etrto.org/

    http://www.iso.ch/iso/en/stdsdevelop...il?COMMID=1302

    to which there is an attempt to standardize the problem.

    But yes the Conti 28mm tires are narrower but taller than other "28mm". I think Conti is basing it on volume and thinks the narrow tire provides less rolling resistance but the taller tire will provide more pinch-flat-protection thus acting like the older 28mm tire...

    Oh well..

  8. #8
    Evil Genius capsicum's Avatar
    Join Date
    May 2004
    Location
    Sumner, WA
    My Bikes
    '92 novara ponderosa, '74 schwinn le tour, Novara fusion, novara transfer, novara randonee(2), novara careema pro, novara bonita(2).
    Posts
    1,529
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    [QUOTE=prestonjb
    But yes the Conti 28mm tires are narrower but taller than other "28mm". I think Conti is basing it on volume and thinks the narrow tire provides less rolling resistance but the taller tire will provide more pinch-flat-protection thus acting like the older 28mm tire...

    Oh well..[/QUOTE]
    Pinch flats I have no idea but rolling resistance would be increased over a short wide tire. Of course construction, max pressure, and wind drag also have a big effect but based on shape alone it would have more rolling drag.
    "Data is not the plural form of annecdote."
    "yuo ned to be deadurcated"

  9. #9
    cycles per second Gonzo Bob's Avatar
    Join Date
    Oct 2003
    Location
    Minnesota
    My Bikes
    Vitus Aluminum, DiamondBack Apex, Softride Powerwing 700, "Generic" Ishiwata 022, Trek OCLV 110
    Posts
    1,790
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Astra
    I think Panaracer tend to be pretty on the nail, size-wise.
    It depends highly on which model. I have Category Elites listed at 23mm that measure 21mm and Paselas listed at 28mm that measure 25mm. I also have a few pairs of various Stradius models listed at 23mm and they all measure 23mm.

  10. #10
    Year-round cyclist
    Join Date
    Apr 2002
    Location
    Montréal (Québec)
    Posts
    3,023
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Even in the same model, sometimes...

    I have Continental Top Touring 2000 700x32 which are 29 mm wide... and 700x37 which are 36.5 mm wide.
    Michel Gagnon
    Montréal (Québec, Canada)

  11. #11
    Mr. Cellophane RainmanP's Avatar
    Join Date
    Nov 2000
    Location
    New Orleans, LA
    Posts
    3,037
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    John E,
    You have hit on my main objection to the Armadillos in road sizes. They not only seem wider than other tires of the same nominal width, but the tread area seems wide and flat. Maybe it's just my imagination, but they just seem to have more rolling resistance. Now I do like the Specialized Infinity Armadillos which come in slightly wider sizes 32,35,38. I run a 32 front and 35 rear on my primary commuter. Pumped up to 100 psi their rounder profile actually seems to have lower rolling resistance than the 28 mm smooth Armadillos due to a narrow raised strip of tread along the center. Again, maybe just my imagination.
    If it ain't broke, mess with it anyway!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •