anybody go to 28mm tires, and NOT like the switch?

Discuss light weight issues concerning road bikes & parts.
alcatraz
Posts: 3370
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

Use the stockpile 23s on the front wheel maybe? Or sell them...

On the rear a 28 will not see much aero penalty. You will have the ability to go lower pressure on rougher roads.

If you are a light rider even 25mm could be "too wide" sometimes. It's all relative.

by Weenie


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C36
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by C36

Tried and let’s be honest they make the bike less responsive deflect more and turn a “nervous” frame into one under Prozac,

25 is a good balance if you look for extra comfort / traction and still have a real road bike feeling.


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AJS914
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Joined: Tue Jan 28, 2014 6:52 pm

by AJS914

BRR isn't showing much penalty to going wider at a lower pressure.

https://www.bicyclerollingresistance.co ... son#drop15

I think that if your frame can take wider rubber and you have the wider rims to stay aero then there is no downside. If you ride on rough farm roads like I do then I think wider and lower pressure will be faster.

That said, even with a 28mm wide rim you are probably still using a 25mm tire since it will baloon out to 28mm. If you had 30mm rims then you could probably jump to 28mm tires.

sychen
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Joined: Thu Apr 24, 2014 1:06 pm

by sychen

Currently riding 28 turbo cottons was on 26mm version before.
Same tubes.. Same wheels... Same bike.

Can I really feel faster/ slower? Not really.
Is it more comfortable it can be depending on pressure set.

Generally set between 70/80psi on both sizes for most rides..
Great part is flexibility.. I get the option of lowering pressure if a gravel section takes my fancy.. And it does on occasions.


Other "improvements" is crosswind stability... 28mm changes the airflow on my clx50s.. 26mm tends to twitch in cross wind more than 28mms..tested on the same routes... My theory is that the air dumps more off the inside edge rather than outside with the 26mm.
Rim profiles will vary results... Just my experience.

Will I stay with 28mms..maybe not.. Maybe I will.. Will see when the time comes to replace these.





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Imaking20
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Joined: Fri Nov 18, 2011 5:19 am

by Imaking20

When I was still riding clinchers I tried some 28mm specialized tires (instead of the turbo cottons I was running) and didn't care for them at all. I gave them away with less than 50 miles of use.

Now as a tubular fanboy I primarily ride 25mm. I'm on my second experiment with 27mm (last time was about a year ago) and remembering pretty quickly that I don't like them either. I normally run my 25s at 80/85 (front/rear). At 70/75, the rear 27 feels too squishy. At 80 in the rear, it feels no different than my 25mm (even on gravel).

So I'm probably about to purge my fatter tires once again..

TobinHatesYou
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Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

I use 25s on go-fast when I know there aren't going to be shitty roads. For everything else there's the 28s on my "climbing" wheels. I may even put 30s or 32s on there since any climbing day also involves descending.

andrey
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Joined: Tue Jun 02, 2009 5:15 am

by andrey

For me it's a bit scary cornering 60+ km/h with pressure less than 7 bar. A bike flows and all thoughts is not loosing a tyre out of rim ^)
Last edited by andrey on Fri Mar 29, 2019 10:33 am, edited 1 time in total.

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kgt
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by kgt

C36 wrote:
Fri Mar 29, 2019 12:58 am
Tried and let’s be honest they make the bike less responsive deflect more and turn a “nervous” frame into one under Prozac,
25 is a good balance if you look for extra comfort / traction and still have a real road bike feeling.
+100
25mm is ideal for most conditions. 28mm is heavier, less responsive, less aero. It makes the bike slower and a road bike is supposed to be anything but slow. I also agree with andrey. Very low pressures are not for road racing bikes rolling on smooth tarmac.

TobinHatesYou
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by TobinHatesYou

7 bars is 100psi. The only time I ever run 100psi these days is TTing or going for a flat or uphill Strava segment. I ride technical descents far, far faster with my 25mm tires around 5.5 bars / 75-80psi. I weigh 61kg / 135lbs however.

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kgt
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by kgt

At your weight 75-80 is maybe fine but for heavier riders it is too low.

TobinHatesYou
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by TobinHatesYou

kgt wrote:
Fri Mar 29, 2019 9:14 am
At your weight 75-80 is maybe fine but for heavier riders it is too low.

And yet Nate P, a co-founder of TrainerRoad races 28s at 70psi. He’s 6’5” and 185lbs.

TimF
Posts: 108
Joined: Wed May 09, 2012 11:18 pm

by TimF

My only comment here echos some of the earlier, 23, 25 & 28 mm tires are often NOT 23, 25 and 28mm on the rim. My "23mm" tires are actually 25mm on my bike. You should take this into account and not automatically buy the tire size thinking that's what you'll get. Take your rim size and search the web against specific tires. On very wide rims I do wonder if 28's end up being more like 30's!

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wheelsONfire
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by wheelsONfire

How aboout minimum inflation (which some don't care for) and tubulars (my sets are all measuring very close to given size/ width)?
I also feel my 23mm Veloflex carbon had a nicer ride feel, than my Vittoria Corsa G+ (25mm)
Both tubular!
Bikes:

Ax Lightness Vial EVO Race (2018.12.21)
viewtopic.php?f=10&t=156137
Paduano Racing Fidia (kind of shelved)
Open *UP* (2016.04.14)


Ex bike; Vial EVO D

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kgt
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by kgt

TobinHatesYou wrote:
Fri Mar 29, 2019 9:23 am
kgt wrote:
Fri Mar 29, 2019 9:14 am
At your weight 75-80 is maybe fine but for heavier riders it is too low.
And yet Nate P, a co-founder of TrainerRoad races 28s at 70psi. He’s 6’5” and 185lbs.
I don't know who Nate P is (don't care to know either) but pros race with 70-80psi pressures at Paris-Roubaix. If you only race on cobbles that's fine.

by Weenie


fromtrektocolnago
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Joined: Sat Dec 07, 2013 10:15 pm

by fromtrektocolnago

one bike with 23's , another with 25's and a third with 32's. the 23's feel the most agile and fastest on good roads. the 32's feel like i'm driving a cruiser and the 25's just feel faster on slightly imperfect roads. the 32's are on a gravel bike. Don't see why anyone would want wider than 25's on a road bike unless one is going to mix in off road gravel with that. my 23's and 25's are the same tire brand although they ride on different wheels. the bikes are similar.
Colnago C-59 (Dura Ace)
Firefly(Ultegra)
Colnago C-64 disc(ultegra) with Bora 35 wheels

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