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Tire Sizing Question(12 posts)

Tire Sizing QuestionMazz
Oct 25, 2001 4:08 AM
I'm planning to buy a set of cheap tires to use on my trainer. I have 700cx23s on right now, but can I put on a 700cx20 on the same rim?
Yes. nmMB1
Oct 25, 2001 4:15 AM
Another tire question, similar...Spinchick
Oct 25, 2001 5:00 AM
any difference in using 28s or 23s with rollers? Would one size be better than the other?

How was your 450 mile weekend?
Sure, more rolling resistance with 28s but not much more.MB1
Oct 25, 2001 5:17 AM
Just run what you got at their highest rated air pressure or even a little higher.

The weather was beautiful, we only got in about 410. We cut Saturday short (3 way big climbs though) to goof off in Greencastle. We shopped a little, ate a lot and just enjoyed the afternoon-sometimes I have hope for us.
On the rollers, resistance is more w/smaller tires...Cima Coppi
Oct 25, 2001 5:31 AM
Take a look at my posting on roller resistance proportional to tire size. You'll see many people answer with an explanation that on rollers a smaller tire provides more resistance. I have tested it, and it works.

Cima Coppi "Roller resistance inversly proportional to tire size??" 10/12/01 8:12am

Never too old to learn something new, thanks. nmMB1
Oct 25, 2001 5:36 AM
Isn't cima Italian for expert or "the tops" nmJohn-d
Oct 25, 2001 5:49 AM
According to Coppi
Oct 25, 2001 5:59 AM
Cima is the Italian word for "top"

23c vs 28czeke
Oct 26, 2001 5:22 AM
This is related to some of the original posts in this thread. I am looking for advice on tire sizes.

I am considering purchasing either 23c or 28c tires on a new road bike. (I have been a mountain biker for the past 5 years). My intended form of riding is distance rather than speed, and will be training for a 400k tour in september 2002. Any advice?
23 is fine for most purposes. 25 is equally fine, a little morebill
Oct 26, 2001 5:40 AM
comfy. These sizes are readily available. 28 is more rare in the racing tire category and seems as if it may be overkill, but maybe not depending on the road surfaces you expect. Try them. All things considered, tires are a relatively inexpensive factor that you need to buy periodically anyway (you CAN spend scads on tires, but you really don't have to -- irony alert -- the more expensive the tire, the shorter they last).
23 is fine for most purposes. 25 is equally fine, a little morezeke
Oct 26, 2001 6:55 AM
thanks for your response.

do you thing 28s would slow me down significantly? by this i mean, do you think i would feel the difference between 23s and 28s?
I have never tried 28's. I don't know what pressure they take -bill
Oct 29, 2001 7:18 PM
which is the key variable. Although the contact patch is a different shape, tires of different widths (assuming the same pressure) all deflect the same amount, which is where you lose the energy. The real world difference comes in when you inflate them. Skinnier tires get inflated to a higher pressure, so that they deflect less and lose less energy. They are also arguably more aerodynamic, but in the real world at average average speeds, I'm not sure how much difference that makes.