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27" wheels and 700cc(10 posts)

27" wheels and 700ccmoschika
Feb 20, 2003 5:59 PM
what's the difference between 27" wheels and 700cc wheels? are they interchangable on a frame?
re: 27 wheels and 700ccHumma Hah
Feb 20, 2003 6:13 PM
I can tell you 27" wheels are about 1/8" larger in diameter at the rim OD than 700c (having just gone thru this exercise). You can't swap tires between them, but 27" wheels will almost always fit a frame intended for 700c, and vice-versa, as long as the axel width is the same.

Sheldon Brown's website has a huge stockpile of info on wheel sizes. Unfortunately, he never gives rim OD, the easiest diameter to measure to determing what ya got.
yes he does!Alexx
Feb 21, 2003 4:22 AM
Rim OD's are:
700c: 622mm
27": 630mm
Often the brakes won't workKerry
Feb 20, 2003 6:22 PM
The 700c rim is enough smaller in diameter that brakes typically can't be adjusted to swap wheels. The larger 27" will often (not always) fit in the frame, but the brakes often cannot be made to work.
Been there. Tried that. Doesn't work. (brakes, that is) nmlook271
Feb 20, 2003 8:57 PM
Sometimes yes, sometimes noMel Erickson
Feb 21, 2003 6:45 AM
Like many other questions regarding bikes, the answers are often ambiguous. It really depends on the frame and fork. I've even worked on old frames where a 700c wheel works in the fork but not in the rear triangle (without new brakes). If you're swapping a 700c wheel for a 27" and find the brake doesn't reach you can get a long reach brake which will probably work. Trial and error is the way I've solved these problems in the past. Currently I'm working on converting a 70's Panasonic touring frame into a single speed. It was originally set up for 27" wheels and I'm putting on a pair of 700c. I won't know if the brakes I've got will work until I get the bike back from the powder coater (today). If not, new brakes. Bikes are a black hole.
it won'tAlexx
Feb 21, 2003 7:45 AM
I also have a Panasonic touring frame used as a fixed-gear-and the cantilever bosses are too high to work with a 700c wheel.
Not the same frameMel Erickson
Feb 21, 2003 8:44 AM
This frame is before they ever thought about cantis. Just the typical center/sidepull frame/fork fittings. We're talking old here.
Sometimes yes, sometimes nomoschika
Feb 22, 2003 9:32 AM
i'm also starting at 27 inch wheels. i looks like i'll just have to try and check out the fit. my lbs gave me similar advice on this.
Try it--it was a straight-across swap on my canti-brake Trekcory
Feb 21, 2003 8:44 AM
When I converted my old Trek tourer to singlespeed, I looked all over for a replacement 27-inch wheel. When I couldn't find a decent one, I just slid the 700c wheels from my wife's bike into the dropouts. All it took was a minor brake adjustment on the cantilever brakes and it worked fine. I'm sure most road brakes don't have enough adjustment, though.