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N00b Question on Bicycle Tire Sizing

Old 02-23-09, 09:49 PM
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Lobby
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N00b Question on Bicycle Tire Sizing

[Hijack] Don't you all get tired of all the n00b questions? [Hijack off]

Folks, I'm finding all this bicycle tire sizing numbering rather hard to decipher. Does anyone have a link to where all that stuff is explained.

Thanks!


Pretty soon (I'd say about 6 months) I won't be a n00b anymore.
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Old 02-23-09, 09:54 PM
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https://www.sheldonbrown.com/tire_sizing.html
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Old 02-23-09, 10:17 PM
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Thanks.

If you don't mind, I still have a coupla:

- on a 700 x 23, where is the 700 measured? on the outside circumference of the tire?

- on a 700 x 23, I suppose the 23 is the width of the tire? In mm?

Is there anything on a tire that measures how high the sidewall is? In cars and motorcycles they use that ratio of tire height to tire width number? Does this exist in bicycle tires?
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Old 02-23-09, 10:52 PM
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The 700 is the theoretical diameter of the tire. Now, all 622 mm diameter rims use 700c tires, no matter what the actual diameter is.
Bicycle tires are round, So, your 23mm wide tire is also 23mm tall. But that will differ slightly depending on the width of the rim.
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Old 02-24-09, 12:11 PM
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All bicycle tires around round, huh?

N00bs learn something every day. Thanks!!
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Old 02-26-09, 10:20 AM
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Originally Posted by Lobby View Post
Thanks.

If you don't mind, I still have a coupla:

- on a 700 x 23, where is the 700 measured? on the outside circumference of the tire?

- on a 700 x 23, I suppose the 23 is the width of the tire? In mm?

Is there anything on a tire that measures how high the sidewall is? In cars and motorcycles they use that ratio of tire height to tire width number? Does this exist in bicycle tires?
{shakes head} Boy, you did it now. You have asked one of the few inponderable questions of cycling. It was a rude joke put on us by europeans best that I can tell.

Tip: get a tat of "what does 700c stand for?" on your arm. Every cyclist you meet will give you a knowing smile.

Jack
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Old 02-26-09, 03:37 PM
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https://www.bikesdirect.com/products/dawes/lt1000.htm This is about the lowest price for a new road bike, but you will need the mechanical savy to do a bit of assembly work and adjustment. The Park Tools website would give a lot of help in this area. On a hybrid bike "performance" would probably indicate no front suspension, which would save weight and ride easier, at the expense of less comfort over potholes. Accessories - floor pump to use at home, minipump to take with you, patch kit, spare tube, tire levers, saddle bag to keep these things on the bike, and water bottle with cage. Size - from middle of crank axle to top tube (centre or top) or to where top tube would meet seat tube if it were horizontal (they call this virtual size). Spend some time to find a helpful bike shop, because that can make the whole bike experience a lot more enjoyable.
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Old 02-27-09, 01:34 PM
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Look at the 700 as an arbitrary number, not really related to the diameter of the wheel. In truth, it bears a historical, rough relation to the size, but it's pretty much lost. 700C means 622mm bead diameter. The other one is related to the tire width, not the tire height. Tires are not round in profile, though they are roughly. The number is actually the distance D/2.5 where D is the distance between the beads when the tire is flattened on a flat surface. But a 700x23C tire will usually have a width of approximately 23mm. Some taller tires will have a narrower width, and of course shorter tires will have a wider width.
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