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Old 08-27-08, 06:58 PM   #1
Fuzzifus
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What size tire on my rim?

OK, here a completely noob question i'm sure, but hey i'm trying.

My current ride is sporting 700cx40c tires. I ride primarily(99%) on pavement/sidewalk/road. I have become immursed by cycling, riding several times a week, with pedals reaching the 35 mile range in one day. It seems that these tires are ill suited for the biking I want to do, as they are fairly treaded, and seem to produce some resistance (noise etc.) Here is my query.......

My rims are Weinmann Zac 19's. They read 700C x 28C/38C.................622x 19. I would like to go to a smaller size slick. What size tire will go with this rim? I will be going to the LBS for the work, but would like to sound educated and have ideas prior to going. I have searched the other threads, but cannot put my finger on the info I need. I have read Sheldon Browns info, but others have said his chart is a bit overkill, on the safe side.

I am looking for a good tire for speed, more of a "road" feel if you will...........
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Old 08-27-08, 07:26 PM   #2
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Seems to me that the wheels are telling you that they're for 28mm to 38mm tires. Sheldon's site says your size rims (622 x 19) are for 28mm to 44mm tires. Do you want to go to smaller section tires than 28mm?
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Old 08-27-08, 07:33 PM   #3
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I had the idea that Iwanted to go 28mm. But when I saw the rim said 700C x 28c, I figured that meant the rim was 28mm. I suppose my real question is this. Given the information I provided, can I go with a 28mm tire? If not, can I go 32mm?

The bike came equipped with 40's, the "splay" out a bit, and I feel slow me down considerably for my city riding/commuting.

Edit:

Someone confirm if I am a complete idiot, sfter reviewing Sheldon's chart it seems that my rims will support 28-44's. I was looking for 28 on the cart, from the 700C x 28C.
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Old 08-27-08, 07:40 PM   #4
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You already got the correct answer - it will be fine.
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Old 08-27-08, 07:43 PM   #5
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Look on Sheldon's chart at 19, the inside measurement of your rim. http://sheldonbrown.com/tire-sizing.html
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Old 08-27-08, 07:47 PM   #6
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Thanks for the replies guys, I feel like an idiot now, but hey, at least I know...........
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Old 08-27-08, 07:51 PM   #7
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Happy to be of assistance..... I need help toooooo!
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Old 08-27-08, 07:58 PM   #8
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Quote:
Originally Posted by Fuzzifus View Post
I had the idea that I wanted to go 28mm. But when I saw the rim said 700C x 28c, I figured that meant the rim was 28mm. I suppose my real question is this. Given the information I provided, can I go with a 28mm tire? If not, can I go 32mm?
According to the information in your post, the rim size is 622mm x 19mm, and they're intended for 700 x 28 through 700 x 38 tires.

My understanding is that the non-aerodynamic portion of the tires' drag is not really a function of tire width, though...that it's more dependent on pressure and tread design and tire material and construction than on width.
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Old 08-27-08, 09:47 PM   #9
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I swapped out 700X35's with some cheap 700X28 Michelin Dynamics. It makes a heck of a difference. You will be doing 50 mile rides on those in no time. You will probably have to swap out your tubes and get some 700X28/32's.

http://www.nashbar.com/profile.cfm?sku=8756
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Old 08-28-08, 01:08 AM   #10
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Sheldon said his chart was conservative, so you could probably go to 25's if desired.
Whatever you pick, you should notice an immediate improvement in acceleration and rolling resistance. Keep them pumped to the max. Expect to have to top off the air pressure more frequently too.
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Old 08-28-08, 08:17 AM   #11
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Even if you went to some fairly light 32's you would see a significant improvement.
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Old 08-28-08, 10:47 AM   #12
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Thanks for all the replies, this has been a ton of help........

I have narrowed it down to two choices, anything else relevant feel free to add.......

Kenda Kick Roller Sport 700 x 28C


Continental Sport Contact 700 x 28C

Any opinions, I have read good reports of both tires...........
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Old 08-28-08, 06:57 PM   #13
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In my experience, Sheldon's chart (and the rim makers' recommendations) are VERY conservative. I've run tires from 23mm to 41mm on both my road bikes (Atlantis and Rambouillet) with no trouble at all. I'm sure you'll be fine with 28s or even 25s.
As for tubes, I've bought only two sizes for at least 10 years: 700x25 for all the family's road bikes and 26x1.5 for all the mountain bikes, using tires from 2.3 inch knobbies down to 1.4 slicks. Everything fits, everything works, no problems.
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Old 08-28-08, 07:02 PM   #14
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Basically, there are small, medium, and large tires. Small tires run around a couple hundred grams. Medium tires are 300 and up.. Large tires 400 gr and up.

Yes, you can use a medium tire. 32c is a great compromise between this and that.
I am using Panaracer Pasela TG folding tires. They may weigh half what your current tires weigh. They are quite lively for their size.

Btw, I was using 28c Marathon Racers last year and decided to jump up to 32c for the better ride quality.
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