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25mm vs 28mm tires

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Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

25mm vs 28mm tires

Old 04-19-16, 09:46 AM
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B1KE
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25mm vs 28mm tires

Has anyone gone up from their 25mm tires up to 28mm? If so how was your experience. I was reading on cycling weekly that wider tires roll faster but is there any truth to this.
.
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Old 04-19-16, 09:48 AM
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Yes, often. I didn't notice a speed increase. 28s are crucial if a certain amount of chipseal is encountered, however.
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Old 04-19-16, 09:55 AM
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The 28c will let you better handle different road surfaces and you can run it at lower pressure.

https://www.bikequarterly.com/images/TireDrop.pdf

Last edited by bikemig; 04-19-16 at 10:16 AM.
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Old 04-19-16, 10:02 AM
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I have switched from 25s to 28s on several bikes used for commuting. In my experience, the 28s are not faster than 25s. They are slower, at least with the tires I've used -- Vittoria Rubino Pros, Rivendell Ruffy Tuffys and Panaracer Gravel Kings. However, the 28s ride nicer (if you lower the air pressure) and seem to last longer than 25s. My commuting route is hilly, so presumably the slower speeds are due to the heavier weight of 28s and all of the hill climbing on my route.
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Old 04-19-16, 10:35 AM
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26mm s-works turbo tires measure to 28 on my wheels, and a plush 32 on some other wheels I'm using. They never seem to get taller than 26, but the width increases. I'm not notably faster or slower, but the wheel is more planted in corners and on rough, loose, or wet ground than it's ever been. There is a profound lack of unpaved roads in my area (except for a gravel service road that makes a nice climb) but some connector bits are packed dirt, and I get much less slipping on those surfaces than I would with a smaller tire. Good rubber quality levels out the bigger size. I've ridden absolute bricks of a 28 before as well.
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Old 04-19-16, 10:58 AM
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I recently went from 26 to 28 (Specialized Turbo Pro slicks) and I love the ride...
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Old 04-19-16, 11:02 AM
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Originally Posted by tarwheel View Post
I have switched from 25s to 28s on several bikes used for commuting. In my experience, the 28s are not faster than 25s. They are slower, at least with the tires I've used -- Vittoria Rubino Pros, Rivendell Ruffy Tuffys and Panaracer Gravel Kings. However, the 28s ride nicer (if you lower the air pressure) and seem to last longer than 25s. My commuting route is hilly, so presumably the slower speeds are due to the heavier weight of 28s and all of the hill climbing on my route.
These are my favorite 28s. Nice ride at a nice price.

https://www.biketiresdirect.com/prod...g-120-tpi-tire

Tempted to try their 32s, if they'll fit in the rear triangle of my Lemond.
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Old 04-19-16, 11:44 AM
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I would run a 28mm Continental GP4000S II on the rear wheel of my Cervelo if it would fit. I don't think it would be any slower than a 25mm GP4000S II.
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Old 04-19-16, 12:02 PM
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Didn't sense any slow down, nor measure it (in minutes at least, don't use a stopwatch), but got comfier ride.
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Old 04-19-16, 01:05 PM
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Originally Posted by rmfnla View Post
I recently went from 26 to 28 (Specialized Turbo Pro slicks) and I love the ride...
What in particular do you like better about the 28?
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Old 04-19-16, 01:13 PM
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Originally Posted by LesterOfPuppets View Post
These are my favorite 28s. Nice ride at a nice price.

https://www.biketiresdirect.com/prod...g-120-tpi-tire

Tempted to try their 32s, if they'll fit in the rear triangle of my Lemond.
Those look good does the 28 mm still weigh only 250 like it says on the website?
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Old 04-19-16, 01:17 PM
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I have set up a 1980 Gitane Trophee frame With 28 mm GP 4000 and I just love them. Great on tarmac and wide enough to be used on gravelroads.
Continental Grand Prix 4000S II 23 25 28 mm Comparison

Last edited by plodderslusk; 04-20-16 at 11:30 AM.
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Old 04-19-16, 01:44 PM
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Originally Posted by plodderslusk View Post
I have set up a 1980 Gitane Trophee frame With 28 mm GP 4000 and I just love them. Great on tarmac and wide enough to be used on gravelroads.
Continental Grand Prix 4000S II 23 25 28 mm Comparison
i just bought a pair of continental grand sport race in 28mm, I wanted to get the go 4000s but heard they puncture quick and don't last long. What have your experiences been?
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Old 04-19-16, 01:48 PM
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I'm going to get 28's when one or both of my 25's wear out...just to run a bit lower pressure and feel more comfortable on packed dirt. I don't care if they result in a small percentage of increased rolling resistance.
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Old 04-19-16, 02:08 PM
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I've got Conti GP 4000 II's in 28's. They're ******. I like 'em very much. Came from some 25mm Schwalabes.

Lower the pressure and scoot over any bull**** in the road.
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Old 04-19-16, 03:02 PM
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Originally Posted by B1KE View Post
Those look good does the 28 mm still weigh only 250 like it says on the website?
I've only weighed one of the 4 I've gotten and it was 240 grams.
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Old 04-19-16, 03:35 PM
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My 25mm GP4000sII measure out to 28.78mm on my super wide Farsports rims at 90psi. I can't say for sure that they are more comfortable than they are on narrower rims but they do feel nice. I don't think I would be able to fit 28's but I might give it a try later on. The 25's are already pretty close to rubbing the underside of the brakes.
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Old 04-19-16, 03:38 PM
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I ride 25s on 23 wide wheels. vernier caliper says 27.5mm. They ride like budda.. and as fast as my fat butt could ever wish [uphill and down]
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Old 04-19-16, 11:53 PM
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Originally Posted by B1KE View Post
i just bought a pair of continental grand sport race in 28mm, I wanted to get the go 4000s but heard they puncture quick and don't last long. What have your experiences been?
Most likely the rear tire will last for only a few thousand kilometres but the extra speed and suppleness makes it Worth IMO. No punctures so far but I have only had them on for 500 km
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Old 04-20-16, 07:06 AM
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Continental 28s 4000 measure 31mm. They are huge
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Old 04-20-16, 07:54 AM
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When I put Conti GP4000s 700x25 on my Bontrager TLR wheels (wider 23mm/17.5mm width), they measure out to 28 mm compared to the Bontrager R3s measuring an actual 25mm. I can see the difference when looking at them but don't notice the difference when riding. In fact, I currently have a Conti on the front and a R3 on the rear.

I am thinking of getting some Panracer GravelKing 700x28 for taking my Domane on more dirt/crushed gravel trails like the C&O Canal Towpath.
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Old 04-20-16, 08:21 AM
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I've got 2-300 on 28's from 25's. I think I'll be switching back when worn.

I found that I can not lower the PSI as I get too much tire deflection. I'm running 120/115. I actually. was able to run 25's slightly lower.

If comfort is your thing these 28's make a huge difference.
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Old 04-20-16, 08:23 AM
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While wider tires do have less rolling resistence, that only applies to a point. The limit is around true 28s and then rolling resistence starts to increase again. In the case of Conti 4000, the 28 is a few watts slower. The same applies generally to other manufactures although I don't have that data in front of me right now. There's also an aero penalty with wider tires.

When people switch to 28s, it's for reasons other than speed.
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Old 04-20-16, 08:30 AM
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I'm planning on moving up from 23 to 25 or 28. I know manufacturers don't always tell the truth on width (and it varies depending on the rims you use). Are they at least consistent within a model? If I have Continental GP4000s II right now in 23 and have more than 3 mm clearance on each side and more than 5 mm on top, would it be safe to assume I'd be ok with a 28 (which I want for plushness), or is it safer to slowly work up to it with a 25 first? Sorry if this is to much of a threadjack, I just see several people posting about widths.
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Old 04-20-16, 08:42 AM
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Where I find that wider tires increase speed is in the smoothness of the ride and the confidence in cornering. You go faster when you feel you don't have to hold back for comfort or safety. I rode 23mm Continentals for a while and switched up to 25mm because the 23s felt squirrely on anything other than smooth, dry pavement. I've had 28s as well and there was no change in my average speeds/times over 50-100 miles, but the clearance to my frame is so close that if I pick up any muck or the wheel gets at all out of true, it rubs the frame. I went back to 25s for frame clearance rather than because I wanted to. My next bike will have ample clearance for 28s.
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