Just wanting to pick up a set of tires for the road bike, changing from
28 to 23 cm, but don't know if the tires on Amazon are sold in pairs or singularly.


Looking at these:
https://www.amazon.com/gp/aw/d.html?p...2SR3O5G&sr=1-5

and has anyone went from 28 to 23 and noticed a difference in speed?

Thanks, for the help!

I don't want to over-dramatize this, but the difference was night and day to me, and I went 25 to 23. I think it is very important though that you look beyond size. There are other factors that make some tires roll better than others, and it's hard to argue with Continentals - they are well-received in these here parts.

Are they sold as a pair or individually?

All tires I have seen are sold individually.

Okay, that clears it up for me! Ty

I have seen the Continental Attack tires sold as a set since the front and rear are a matched set with different tread patterns for the front and rear.

My road bike and my wife's road bike both came with Ultrasports. Very nice rolling tire but flat prone and not long lasting (less than 2K miles before mine was worn down to the belts). Replaced with Gatorskins on both and they've been great. Pro Bike Kit has them for under $30 each with free S+H.

I have 23s on our road bikes and 28s on my commuter. Big difference in feel.

Other than the Placebo Effect, don't expect miracles in speed improvement. Tire rolling resistance is the result of a number of factors of which tire cross section is only one. Contrary to mythology the narrowest section tire doesn't always have the lowest rolling resistance. For some, depending on rider weight, the lowest resistance, and best handling is with slightly wider tires.

I'm not saying narrow isn't good, just that narrowest isn't always best.

First, tires are always sold as individuals with the rare (and expensive) exception of front/rear specific designs.

Second FBinNY is quite correct that a narrower tire isn't always faster. What you might notice is a weight difference. 700-28 tires are usually intended for touring or utilitarian use and can be quite heavy to improve durability. A "high performance" 700-23 tire will often be much lighter ( and less durable) and the weight difference can easily exceed 100 grams per tire.

I would concur about not assuming a great increase in speed or decrease in rolling resistance, and part of the difference is not width but the typically higher tire pressure - the advantage of which can be negated on rough roads. In addition flats and having your wheel damaged due to the lessened distance between the rim and road can really slow you down! Make sure your rim is narrow enough to give proper protection to your rim and proper handling with that narrow a tire.

I went from Rubena Flash 28(a junk), to 28 CST (another junk) to Continental GP3000 622x20 (that is quite good and in 5years i had only one flat and i ride only on asphalt (but it's seriously degraded with holes-bumps-rocks-dust-cement-etc in/on it.. administrative part of my city are not doing their job properly.. )
I saw an improvement right away, and trimmed off 700grams in total, from 500g/tire, to 180g/tire, and at 30-50$ are very nice tires fold-able, lite, with kevlar/vectran. That improvement is about how i feel and how fast i get tired, I'm not a professional rider, and I do not keep track of my performance, and that was some 5years ago.

The above is a good experience but again it's not about what was on the bike first and what it was changed to but rather what rim you are mounting it on. As you can see at Sheldon's site - https://www.sheldonbrown.com/tire-sizing.html on the chart labeled "Which tire fits safely on which rim?" It is difficult to find a rim where one could safely use both a 28 and a 20 mm tire. In my experience you would be ill-served if you mounted a 20mm on a rim wider than 15mm, especially if you are heavy or on bad roads often, and 15 is even stretching it.

it's on mavic MA40, i think it's 17-18 inside, it certainly have 20mm on outside (the rim is level with the tire, i don't even need a quick-release brake caliper) - is a bit to wide for 20, but i have it for 5 year now, and it still works, no flats, no pinch. (only one last year from a barbed wire or similar), I'm good with this setup.