dator97

ok i have a shwinn varsity 14 speed road bike i love the bike but im lost on what is 700c tires and inner tubes i have looked for that info i cant find it the rims mesure at right around 25 and the only info i can find is 700c is 28-29 inch how is this if rim is 25 across???

please help me understand

tom

dperreno

Go to the sticky called Sheldon Brown shortcuts and scroll down to "Tire sizing" and click on it. Everything you ever wanted to know, and then some.

Here's the link just in case: https://sheldonbrown.com/tire-sizing.html

dator97

no sorry that still did not answer my questions i'm still lost and i've read the 3 times now

700 C622 mm Road bikes, hybrids, "29 inch" MTBs.
(28 x 1 1/2 F.13 Canada)
how can a 28x1 1/2 fit on a 25 rim?

coldfeet

Tire sizes sometimes refer to the outside of the tire, if you think about it, this is an uncertain way to measure, as the critical measurement is the diameter of the rim seat. If it don't fit there, the rest don't matter. The important measurement you're looking for is the 622, this is the diameter of the rim bead seat. It's the rim seat measurement of 700c tires.

"how can a 28x1 1/2 fit on a 25 rim?"Simple, the outside diameter is approximately 28" but the bead will measure 622mm within a fairly tight tolerance.

CACycling

Normally rims will be marked somewhere with their size (622 for a 700C rim). 700C rims are roughly 25" in diameter. 700C tires are going to be 27" or more in diameter depending on the tire size.

dperreno

What he said.

Look, just replace the tire with the same size that you had on the bike before. If your old tire says 700c (which DOESN'T mean 700 cm, btw), then get a 700c tire to replace it with. If you had 27" x 1-1/4" tires on there, get 27" tires. The diameter is the most important measurement, you can vary the width within a reasonable range. Any bike shop will make sure you get the right size if you show them the old tire or bring in the wheel or bike.

dator97

k i just think its rather confusing for if rim is one size then you would think its about one inch bigger not 2 but nw ty for the help

Jeff Wills

Read through the Sheldon Brown article again. Really read through it. Study the subject in all its aspects.

Yes, bicycle tire sizing is confusing, mostly because the markings on the side of the tire often have no relationship any real physical measurement of the tire, tube, or rim. If you don't understand that, try politics- that's another subject where what's said doesn't have anything to do with reality.

wrk101

+1 Look at the markings on your current tire. Take it to the bike shop of your choice. They will sell you exactly what you need.

Al1943

A typical current 700 road wheel including the tire is actually smaller in diameter than a 27 inch wheel with tire.
The 700 is a standard wheel diameter including a tire larger (35mm) than most of us will ride. The "C" is the rim's cross-sectional configuration. A "B" rim is wider than a "C".

CACycling

My 700c x 28s are 27" in diameter when mounted and inflated (was curious when I read the OP's cquestion so I measured my commuter which happened to be sittting next to my desk). 35s are going to be larger.

DX-MAN

You're confusing terms -- 700c, 27", 29", 26", etc., is TIRE size, not rim/wheel size. That means outside diameter of the tire. OF COURSE the rim will be smaller -- it has to fit inside the tire.

Tires are ALL marked with size info on the sidewall -- replace with the same size, and it's monkey-proof.

Don't make it more complicated than it is.

dator97

gotcha will do on the cheap 200 dollar shwinn bike with right tires next time but to do that i need order em online or go 10 miles out of way to get right tubes lol no worries ty for the help and im better understanding now

wrk101

While I buy a lot of stuff on line, it is best suited for buyers who know exactly what they want. For someone not totally sure, it is cheaper to go 10 miles and buy the right stuff in person. Trying to return on line mistakes is painful.