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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 07-09-08, 08:14 AM   #1
RboarderI
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What size 700c tire?

What size 700c tire should I buy to fit on the wheel listed below. This wheel is going on my fixed gear conversion... I have noticed that there are a few different sizes or 700c. Thanks!

Tech Spec
Pin joint, 28, 32 or 36 holes, silver / black
700C-470g, ERD 598mm, ETRTO 622X14mm
http://www.alexrims.com/product_deta...=1&cat=1&id=49
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Old 07-09-08, 08:17 AM   #2
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i'm not sure what you mean, most times size is just a personal preference. i run a 25 on the front and a 26 on the rear. it depends on where you're riding and what style riding you'll be doing
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Old 07-09-08, 08:18 AM   #3
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http://sheldonbrown.com/tire-sizing.html#width
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Old 07-09-08, 08:18 AM   #4
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700c referes to the diameter of the rim so any 700c would work, you will have to decide on a width of tire, i run a 700x25 on my fixed gear, a pretty good width for the riding that i do
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Old 07-09-08, 08:31 AM   #5
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I'm running 28's. I ride cement, grass and dirt.
I think I'm going with 25's next.
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Old 07-09-08, 09:49 AM   #6
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i had this same question but with some weinmann deep v track wheels. is the only difference between 23 and 25 just a couple mm width? is urban riding more of a 23 preferred ride?
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Old 07-09-08, 09:55 AM   #7
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i had this same question but with some weinmann deep v track wheels. is the only difference between 23 and 25 just a couple mm width? is urban riding more of a 23 preferred ride?
for urban, 'asbigascanfitbetweenthestays/fork' is peferred, IMO.

I ride 28s everywhere
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Old 07-09-08, 10:14 AM   #8
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sick. thanks for the info.
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Old 07-09-08, 10:17 AM   #9
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i had this same question but with some weinmann deep v track wheels. is the only difference between 23 and 25 just a couple mm width? is urban riding more of a 23 preferred ride?
This will depend on who you ask and their preference. I ride 23mm in the city just fine, some of my friends ride 23, some 25, some 28. Try out different sizes and find what you like.
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Old 07-09-08, 10:36 AM   #10
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is the only difference between 23 and 25 just a couple mm width? is urban riding more of a 23 preferred ride?
In theory yes, a couple of mm difference. But it varies from manufacturer to manufacturer.
It's been said that 25's actually have a smaller contact patch than 23's.
Bigger is more comfortable.
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Old 07-09-08, 10:45 AM   #11
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It's been said that 25's actually have a smaller contact patch than 23's.
I'd like to know by whom that's been said.

What's true is that a tire that is claimed to measure 25mm does not always measure 25mm. Sheldon has a good article on this, too. So though you'd be hard pressed to find a 25mm tire with a markedly smaller contact patch than a 23mm, you might find one such pair that measures about the same width-wise, and that both give a contact patch that's more or less identical.

The prevailing opinion on this thread is good advice, I think. For city riding, you'd do well with a higher-volume tire pumped up to a lower pressure. As for me, I'm on Continental Town & Country's, which measure two inches across, or about 50mm, to put things in perspective.
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Old 07-09-08, 10:55 AM   #12
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I'd like to know by whom that's been said.
I confused contact patch with rolling resistance.

From Sheldons site...

"A common debate among cyclists centers on the issue of whether a wider tire has more or less rolling resistance at the same pressure. The constant pressure is proposed because it appears more scientific to eliminate this as a variable, but this is not realistic in practice. The short answer to this question is that, yes, a wider tire of similar construction will have lower rolling resistance than a narrower one at the same pressure. This fact is, however, of no practical value. If you are comparing two tires of similar construction, with the same load, and the same pressure, either the wider tire is overinflated, or the narrower tire is underinflated!"

Last edited by 667; 07-09-08 at 11:01 AM.
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Old 07-09-08, 11:08 AM   #13
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I always use 23 and inflate to 120, but Im thinking about going up in pressure.
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Old 07-09-08, 11:31 AM   #14
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I'm rollin' on 32s.

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Old 07-09-08, 11:38 AM   #15
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been recently trying the specialized roubaix 700/ 23-25
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Old 07-09-08, 12:02 PM   #16
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I always use 23 and inflate to 120, but Im thinking about going up in pressure.
OP, there is no reason to do this.
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Old 07-09-08, 12:13 PM   #17
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OP, there is no reason to do this.
which part?
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Old 07-09-08, 12:14 PM   #18
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OP, there is no reason to do this.
maybe the rider is heavy and doesn't like saggy tires.
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Old 07-09-08, 01:20 PM   #19
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maybe the rider is heavy and doesn't like saggy tires.
120 psi in a 23mm tire is hardly saggy by anybody's standards. I think it's safe to assume that the OP's not riding in a velodrome or on perfect tarmac, either.
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Old 07-09-08, 02:40 PM   #20
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I just want to get a little less rolling resistance on the rear tire by inflating it more.
I don't like how much it spreads against the road.
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Old 07-09-08, 02:49 PM   #21
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I just want to get a little less rolling resistance on the rear tire by inflating it more.
I don't like how much it spreads against the road.
Eat a salad.
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Old 07-09-08, 05:49 PM   #22
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I thought I'd ask this embarrassing question deep within an existing thread.

But on the Weinmann V's, there was a sticker that said safety line 700x23[or 25].
Does this mean that running 700x25s on them would be "unsafe?"
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Old 07-09-08, 06:01 PM   #23
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120 psi in a 23mm tire is hardly saggy by anybody's standards. I think it's safe to assume that the OP's not riding in a velodrome or on perfect tarmac, either.
Unless the guy is like above 130lbs.

Which is a lot of guys. Somebody reposts waldos (zipp eng) post on tire pressure from the road forum please...
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Old 07-09-08, 07:31 PM   #24
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I thought I'd ask this embarrassing question deep within an existing thread.

But on the Weinmann V's, there was a sticker that said safety line 700x23[or 25].
Does this mean that running 700x25s on them would be "unsafe?"

I run 28's on them no problem.
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Old 07-09-08, 07:37 PM   #25
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Continental Grand Prix 4000S's 700c/23. 120PSI. I am 6'5" 215lbs. City Streets/Country Roads.

Fine by me.

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