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I need a help with choosing a wheelset for my Miele bike.I can't fully understand if it is possible to replace my old rigida 27 inch wheels for 700c coz i have too little free place.I visited a site where there is a size table of wheels and saw that it is possible(judging by numbers).There are no 27 inch wheels in my country at all,so im made to think of whether to put 26" or if possible 700c.enter image description here

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There a lot of charts posted on the internet explaining the complex data of bicycle wheel sizing. In your case you likely have standard 27 inch wheels that equate to a 630mm iso wheel. A 700c wheel is iso size 622mm, slightly shorter than your current wheel. The primary concern is if your brake pads can move close enough toward the axle to contact the brake surface of the wheel. Then you need to match the axle mounting type, basically bolt-on or quick release. Then comes hub width. Ideally you would like to match your old one however there are articles about drop out spreading on steel framed bikes. Definitely not recommended for aluminum or carbon frames.

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  • So,as i understood it is possible if my brake pads will fit the rim?But how is 27 inch wheel bigger than 28, or these "inches" are very relative and all depends from tire?
    – Nikita
    Commented Aug 3, 2019 at 23:06
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    The inches were measured with different tyres, including the tyre. Always go for ISO sizes when uncertain. They measure hub to rim, and are independent of what tyres people used a century ago.
    – gschenk
    Commented Aug 3, 2019 at 23:10
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    @Nikita - A 27-inch tire fits a larger diameter rim than a 28-inch tire. Tire sizes (other than ISO) make no sense.
    – Daniel R Hicks
    Commented Aug 4, 2019 at 0:41
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    Adding to the nonsense of tire sizes, some tires marked the same size are different diameters, e.g. there are 4 different Iso wheel sizes for 26" tires and two of those are 26x1 3/8 - sheldonbrown.com/tyre-sizing.html
    – mattnz
    Commented Aug 4, 2019 at 1:59
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    I have had issues getting a quick-release tight enough on some horizontal drop outs. High loads cause the wheel to torque over and become misaligned.
    – mikes
    Commented Aug 4, 2019 at 8:48

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