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  1. #1
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    Wheel upgrade question

    I currently have 27 x 1 1/8 wheels. The rims measure to be approx 25 1/4" (641mm). In a perfect world, I'd swap them for rims that measure more like 650mm to give a bit more to the short reach calipers that I've already installed. If I understand the standards correctly, rims for current 700c wheels measure in at 622mm.

    So...the question: Are there modern rims that measure in at 650mm?

    Thanks.

  2. #2
    Senior Member miamijim's Avatar
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    Quote Originally Posted by Rickalodeon View Post
    So...the question: Are there modern rims that measure in at 650mm?

    Thanks.
    No, your ISO 630 (27-1/4) rims are it.
    WWW.CYCLESPEUGEOT.COM 2005 Pinarello Dogma; 1991 Paramount PDG 70 Mtb; 1976? AD Vent Noir; 1989 LeMond Maillot Juane F&F; 1993? Basso GAP F&F; 1989 Terry Symmetry; 2003 Trek 4700 Mtb; 1983 Vitus 979

  3. #3
    Bianchi Goddess Bianchigirll's Avatar
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    Right your 27"/630 are the largest except some odd old Raleigh 3 spd.

    There are 650 b and c rims but strangely they are smaller.
    Bianchis '87 Sport SX, '90 Proto (2), '91 Boarala 'cross, '93 Project 3, '88 Trofeo, '86 Volpe, '89 Axis, '79 Mixte SOLD, '99 Mega Pro XL Ti, '97 Ti Megatube, , '90 something Vento 603,

    Others but still loved,; '80 RIGI, '80 Batavus Professional, '87 Cornelo, '86 Bertoni (sold), '09 Motobecane SS, '98 Hetchins M.O., '09 K2 Mainframe, '89 Trek 2000, '?? Jane Doe (still on the drawing board), '90ish Haro Escape

  4. #4
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    Quote Originally Posted by miamijim View Post
    No, your ISO 630 (27-1/4) rims are it.
    miamijim and Bianchigirll....thanks for your responses. Yeah, I just found some additional info on Sheldon Brown's site. So 700c wheels have a 622mm bead seat diameter. And my 27 inch wheels have a 630mm BSD. So my perfect world would have included a 640mm wheel....which as you indicated doesn't exist.

    Thanks again.

  5. #5
    Senior Member Grand Bois's Avatar
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    Doesn't make more sense to look for brakes to fit the wheels instead of wheels to fit the brakes? It will probably be much cheaper.

  6. #6
    What??? Only 2 wheels? jimmuller's Avatar
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    Nobody ever said bike dimensions had to be rational.
    Real cyclists use toe clips.
    jimmuller

  7. #7
    Senior Member zukahn1's Avatar
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    Quote Originally Posted by Grand Bois View Post
    Doesn't make more sense to look for brakes to fit the wheels instead of wheels to fit the brakes? It will probably be much cheaper.
    +1 A lot of vintage frames require medium or long reach brakes. Modern short reach brakes just aren't right for most bikes with 27inch wheels.

  8. #8
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    Quote Originally Posted by zukahn1 View Post
    +1 A lot of vintage frames require medium or long reach brakes. Modern short reach brakes just aren't right for most bikes with 27inch wheels.
    Unless your modern bike was designed for 700c wheels and long reach brakes, then put on the 27s and short reach brakes. But that would be stupid. That's why I did it.

    I'm not the sharpest hammer in the sky.
    *Recipient of the 2006 Time Magazine "Man Of The Year" Award*

  9. #9
    Senior Member Lascauxcaveman's Avatar
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    Quote Originally Posted by The Golden Boy View Post

    I'm not the sharpest hammer in the sky.
    I LOL'd
    ● 1971 Grandis SL ● 1972 Lambert Grand Prix ● 1972 Raleigh Super Course ● 1972 Peugeot UE-18 Mixte ● 1980 Apollo Prestige fixie ● 1982 Motobecane Jubile Sport ● 1983 Nishiki Landau ● 1984 Peugeot PH10LE ● 1984 Bianchi Limited ● 1985 Peugeot Vagabond ● 1985 Trek 600 ● 1985 Shogun Prairie Breaker ● 1985 Raleigh Elkhorn ● 1986 Univega Nuovo Sport ● 1987 Schwinn Tempo ● 1996 Kona Lava Dome ● And a Bike to Be Named Later ●

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