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Old 07-27-07, 08:26 PM   #1
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What size tire do I need?

Hey, I just picked up an old Concord road bike at a yard sale today, but it didn't have any tires on it so I'm on a mission to find the right size. The diameter of the rim is about 25.5". I compared it against the stock rims/tires on my Trek, and the diameter of the rims on my Trek are 25" and the tires are 700x25c. I'm not really sure how to interpret this as I don't know much about bike tires at all, does anyone have any idea of what size tires I need?
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Old 07-27-07, 08:29 PM   #2
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Read this article and it should answer your questions:

http://www.sheldonbrown.com/tire_sizing.html
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Old 07-27-07, 08:44 PM   #3
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Read this article and it should answer your questions:

http://www.sheldonbrown.com/tire_sizing.html
I've read through that a few times but it still doesn't make much sense to me. It says older road bikes are normally 27xsomething, but my Trek with the smaller rim uses a 700x25 tire? Sorry I'm not catching onto this, it's just not making much sense...

With only a half inch difference between my Trek and my Concord's rims, will a 700mm tire fit my Concord too?

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Old 07-27-07, 09:33 PM   #4
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I'm wanting to get in on the 20% off sale ending tonight at Nashbar, if anyone could answer this question ASAP I would GREATLY appreciate it

When sheldonbrown.com says older road bikes use 27" tires, would a bike from the 70s or early 80s be classified as an old bike?
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Old 07-27-07, 09:37 PM   #5
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When you say "greatly", does this mean a cash reward?
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Old 07-27-07, 09:40 PM   #6
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When you say "greatly", does this mean a cash reward?
No, but you can have the satisfaction of knowing you helped save a college kid from a looong walk to campus every day
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Old 07-27-07, 09:42 PM   #7
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Have you tried to put on the 700 X 25 from your trek bike onto the bike?
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Old 07-27-07, 09:45 PM   #8
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Have you tried to put on the 700 X 25 from your trek bike onto the bike?
No, I don't have any experience swapping out tires and I'd rather not do that unless I absolutely have to. My Trek is my ride to work, so I can't really afford to experiment with it. Would it work even though the Concord rim is slightly larger?
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Old 07-27-07, 10:09 PM   #9
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27" rims are about 1/3" larger diameter than 700C rims and the tires for one will not fit on the other.
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Old 07-27-07, 10:15 PM   #10
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27" rims are about 1/3" larger diameter than 700C rims and the tires for one will not fit on the other.
So I made the right choice by ordering a pair of 27x1-1/4" tires? Hopefully so, the 20% meant free shipping + $1 off
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Old 07-27-07, 10:50 PM   #11
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No, but you can have the satisfaction of knowing you helped save a college kid from a looong walk to campus every day
I think walking is good exercise. Cash however does a good deal of talking.
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Old 07-27-07, 11:06 PM   #12
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700c rims have a bead seat dia. of 622 MM or 24.49"
27" rims have a bead seat dia. of 630 MM or 24.80".
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Old 07-28-07, 09:47 AM   #13
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Try looking carefully everywhere on the rim. They are often stamped with the rim size somewhere.
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Old 07-28-07, 10:33 AM   #14
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Try looking carefully everywhere on the rim. They are often stamped with the rim size somewhere.
There is "12 05 19" stamped several times on the rim, but I don't see anywhere that tells the rim size. Unless these numbers do, I don't really understand what they mean.
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Old 07-28-07, 10:36 AM   #15
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27" x whatever is NOT compatible with 700c x whatever\

If the rims on your concorde are larger than your Trek, and the concorde is an older road bike, it most likely is 27" x whatever. The easisest way to confirm is just to read the size of the tire. Alternatively, if the rims are steel, that's usually a good indication of 27" wheels.
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Old 07-28-07, 01:48 PM   #16
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So I made the right choice by ordering a pair of 27x1-1/4" tires? Hopefully so, the 20% meant free shipping + $1 off
I just measured the rims on my 32 year old Fuji and they are 25.5" in diameter. They use 27" tires so the 27X1 1/4" tires you bought should work.
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Old 07-28-07, 02:50 PM   #17
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Late '70's Schwinn Letours, etc., were 27"
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Old 07-28-07, 02:56 PM   #18
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I just measured the rims on my 32 year old Fuji and they are 25.5" in diameter. They use 27" tires so the 27X1 1/4" tires you bought should work.
Awesome! Thanks for measuring your rims, that put my mind at ease
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