Wheel size confusion.

by pandeiro   July 26, 2009  

Thinking my 1980 peugeot has original rigida rims, rigida chromage superchromix,(28x1.5/8x1.1/8 700c 1982. stamped on). The tyres are 700/23, does anyone know would I be able to use 27 inch wheels, what's the difference of 700c and 27 inch?.. are my wheels 27, though they are stamped 28? Confused

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A 700c is smaller diameter than a 27", it's a very confusing situation as you would think that 700mm would equate to around 27.6", but it appears that at some point in history one was based on the circumference of the wheel and tyre (700c) and the other based on rim only (27").

Basically, if your bike is built for a 700c and has tight clearances, you will probably not get a 27" in (and why you would want to I'm not sure as 27" is a ever decreasing option).

The other way round works okay (27" frame clearance with 700c wheels), you need brakes with a longer drop to allow the pads to be dropped low enough to sit correctly on the smaller diameter rims though.

Complicating matters since 1965

DaSy's picture

posted by DaSy [648 posts]
26th July 2009 - 19:48

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If the tyres you have are 700c then the wheel you have is 700 and not 27 inches.

The difference isnt huge and you may be able to get a 27 inch wheel in there though there's another problem with the spacing between the dropouts as 27inch is older and the space is a few mm's narrower.

However as 700 is the modern standard why would you want to go back to a 27inch wheel?

www.sheldonbrown.com is a great resource for this type of stuff

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posted by TheHatter [810 posts]
26th July 2009 - 19:48

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Thanks, so I need to stick to 700 wheels, that's cleared that up! Smile

pandeiro

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posted by pandeiro [19 posts]
26th July 2009 - 22:06

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are you looking to replace your wheels then?

Dave Atkinson's picture

posted by Dave Atkinson [7230 posts]
26th July 2009 - 22:13

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Well the worst thing about my peugeot is the braking performance. The rims are the old dimpled effect braking surface, they are ok in the dry but in the wet are suicidal Crying I fancied getting some wheels off ebay, or cheapish new, Wink

pandeiro

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posted by pandeiro [19 posts]
26th July 2009 - 23:14

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