what size are my wheels?

mark75k9 said:

i'm new to cycling and was hoping someone could tell me waht size my wheels and/or tires are. the only info i can give is the tires are contnental sew-up and say 300g 22mm and the rims say flamme italy and measure about 25 inches across. I bought the bike used and need to replace them. thanks😕

Sizes of bicycle wheels --- unlike car and motorcycle wheels --- indicate the nominal outside diameter of the TIRE, and not the actual diameter of the rim.
The real size of a 27" rim is 630mm (about 24.8"😉, a 700c rim has a bead seat diameter of 622mm, and the "26-inch" rim found on tandems and mountain bikes is only 559mm (a mere 22"😉.

Conti tubulars only come in one size, see:

http://www.conti-online.com/generator/www/de/en/continental/bicycle/themes/tires/race/olympic/olympic_en.html

EDIT: OK, I stand corrected. :o 3 sizes...

gclark8 said:

Conti tubulars only come in one size, see:

http://www.conti-online.com/generator/www/de/en/continental/bicycle/themes/tires/race/olympic/olympic_en.html

Wrong!

Conti makes the sprinter in 26 (650) and 27 (700)

http://www.conti-online.com/generator/www/de/en/continental/bicycle/themes/tires/race/sprinter/sprinter_en.html

And to make things more confusing, they even make a 24 inch tubular.

http://www.conti-online.com/generator/www/de/en/continental/bicycle/themes/tires/race/sonderklasse_steher/sonderklasse_steher_en.html

I expect 700c