Go to 28mm or not?

MTB99
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Go to 28mm or not?

Postby MTB99 » Wed Jan 27, 2016 7:42 pm

Hi All,

I have been reading about the trend and the the possible proven reason to increase a roadie tire size up to 28mm, it appears that it is the way to go.

Do you agree?

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open roader
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Re: Go to 28mm or not?

Postby open roader » Wed Jan 27, 2016 8:51 pm

It depends upon what it is you want to go to 28mm for...... go to 28mm for specifically what purpose?
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silentbutdeadly
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Re: Go to 28mm or not?

Postby silentbutdeadly » Wed Jan 27, 2016 10:33 pm

Sure. Why not? If there's tyres with air in them then there's a ride.
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rodneycc
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Re: Go to 28mm or not?

Postby rodneycc » Wed Jan 27, 2016 10:35 pm

Yeah I'm with Open Roader depends what specifically you intend to ride and what you are trying to achieve. For commuting I'd say yes 28mm for a little more comfort but for general road riding on good roads then think 25mm is the sweet spot, IMHO.
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cyclotaur
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Re: Go to 28mm or not?

Postby cyclotaur » Wed Jan 27, 2016 11:09 pm

If you tend to ride s fair bit of sprayed aggregate sealed road (think of regular rural road surfacing) as opposed to smoother asphalt surfaces (most urban main roads) then 28s are great for a smoother roll, and a less fatiguing ride. Around town 25s are fine.

I must say though I love my 28s. Must try them on my lighter stiffer wheels one day.
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MTB99
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Re: Go to 28mm or not?

Postby MTB99 » Thu Jan 28, 2016 6:07 am

I commute to work 35km each way twice a week and have started to try and do a 60 to 80km road ride once a week.

My bike a Focus Cayo already has 25mm tires and I am happy with this however most things I read a pointing towards the bigger tire

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open roader
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Re: Go to 28mm or not?

Postby open roader » Thu Jan 28, 2016 7:39 am

Well, if it's comfort you want over a longer distance, then yes, a higher volume tyre can assist you.

My main road bike is set up with a 27mm on the back and a 25mm on the front - this set up suits me perfectly. I can run the higher volume rear 27mm at a considerably lower pressure than I did with a 25mm in the rear and not suffer pinch flats or perceived rolling resistnace. All this makes a lot of difference to me on pock marked chip seal rural roads which is where I do 100% of my riding.

From my experience 27mm is a significant enough jump from 25mm so 28mm should be a worthy step. Assuming you have sufficient frame and brake caliper clearance, initially buy just one tyre and put on the back and see if you like running a lower pressure in it than your 25mm.
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Patt0
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Re: Go to 28mm or not?

Postby Patt0 » Sat Jan 30, 2016 12:11 pm

What pressure would you run 28's at?

I have 28's and at 95kg + 6kg backpack my rear is looking a bit flat at 90psi. Can I go higher?
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Thoglette
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Re: Go to 28mm or not?

Postby Thoglette » Sat Jan 30, 2016 12:38 pm

Patt0 wrote: Can I go higher?
The question should be: "can you go lower?" 28mm is still on the skinny side of the fence, especially with 100kg of load.

I'm currently running 21 (tubs), 23,28 and 32 on different bikes and have been down to 19 and up to 50 over the years.
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Re: Go to 28mm or not?

Postby softy » Sat Jan 30, 2016 5:36 pm

I would say 28s run at around 65 - 70psi.

what people don't realise, it is not 28 -25 = 3mm bigger. You need to realise it is the area of the circle. There is alot more air in them.

i have a heavy 23kg ebike with a 30 on the back and 25 on the front (tubulars). I run the back at 65psi and the front at 90psi.

goes pretty good. Even then i could lower the pressure as being a ally bike the ride is a little harsh.

My roadies all carbon bling bikes i like to run high pressures. 100 to 120psi in 25s and 22mm tubulars.

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foo on patrol
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Re: Go to 28mm or not?

Postby foo on patrol » Sat Jan 30, 2016 8:54 pm

Make sure they fit in ya forks, before buying! :idea: :wink:

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Mjainoz
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Go to 28mm or not?

Postby Mjainoz » Sat Jan 30, 2016 9:23 pm

Rim width effects tyre width.
My 23s run 25mm wide on 25mm rims.
The 25s run near 28 wide on 25 rims.
(Conti 4000S II)

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Re: Go to 28mm or not?

Postby Mulger bill » Sun Jan 31, 2016 12:13 am

Mjainoz wrote:Rim width effects tyre width.
My 23s run 25mm wide on 25mm rims.
The 25s run near 28 wide on 25 rims.
(Conti 4000S II)
Agreed, I've just fitted the same 4000S II boots to some 26mm rims as part of a new build and they look slightly wider than the 28mm Gators on 22mm rims. Should get the calliper out...
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Re: Go to 28mm or not?

Postby Duck! » Mon Feb 01, 2016 1:31 pm

foo on patrol wrote:Make sure they fit in ya forks, before buying! :idea: :wink:
Yes!
softy wrote:What people don't realise, it is not 28 -25 = 3mm bigger. You need to realise it is the area of the circle. There is a lot more air in them.
Yep. Tyres form a roughly circular cross-section, so any increase in width brings a correspondingly taller profile. That's a considerable increase in volume, and reduction in vertical as well as lateral clearance.
I had a thought, but it got run over as it crossed my mind.

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Re: Go to 28mm or not?

Postby chill » Mon Feb 01, 2016 6:50 pm

Just put 28mm Rubino Pros with H Plus Son Archetypes on one of my roadbikes. So smooth...

tez001
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Re: Go to 28mm or not?

Postby tez001 » Tue Feb 02, 2016 7:27 pm

Agree with trial fitting before purchase. My commuter fits 28mm on the rear however only 23mm on the front. Are there any issues with running different widths?

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Re: Go to 28mm or not?

Postby find_bruce » Tue Feb 02, 2016 7:49 pm

tez001 wrote:Agree with trial fitting before purchase. My commuter fits 28mm on the rear however only 23mm on the front. Are there any issues with running different widths?
Apart from not being able to do the traditional trye change of "new to front, front to rear, rear to bin" nope. I run 42mm rear & 32mm front on my commuter, regularly run 28mm rear and 23mm front on my roadie

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Re: Go to 28mm or not?

Postby tez001 » Tue Feb 02, 2016 8:36 pm

Thanks Bruce.

Not too concerned with the traditional swap on the commuter as I now have at least two of each and the front outlasts the rear by 2 or 3 times the front. I also have different brand tyres back and front on the commuter :)

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Re: Go to 28mm or not?

Postby madmacca » Tue Feb 02, 2016 10:33 pm

Patt0 wrote:What pressure would you run 28's at?

I have 28's and at 95kg + 6kg backpack my rear is looking a bit flat at 90psi. Can I go higher?
Take a look at the inflation chart and front/rear weight distribution at http://www.bikequarterly.com/images/TireDrop.pdf

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Re: Go to 28mm or not?

Postby softy » Tue Feb 02, 2016 10:40 pm

To be absolutely correct you shouldn't run 25 or 28mm on 19mm clinchers (as per the manufacture) the tyres are designed to be rounder like a tubular and run on wider rims, so; yes they will fit but you are not getting the full benefit.

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Re: Go to 28mm or not?

Postby warthog1 » Wed Feb 03, 2016 11:12 am

Mjainoz wrote:Rim width effects tyre width.
My 23s run 25mm wide on 25mm rims.
The 25s run near 28 wide on 25 rims.
(Conti 4000S II)
Conti tyres size up bigger than other brands too. A 23 in a conti GP4000S is closer to a 25 in a Michelin or Schwalbe than it is a 23 IME.
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Thoglette
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Re: Go to 28mm or not?

Postby Thoglette » Wed Feb 03, 2016 12:33 pm

warthog1 wrote:Conti tyres size up bigger than other brands too. A 23 in a conti GP4000S is closer to a 25 in a Michelin or Schwalbe than it is a 23 IME.
Not on my bike - their "32" measured at 28mm. The Michelin came in at 32. Bottom line: YMMV
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Re: Go to 28mm or not?

Postby Mjainoz » Wed Feb 03, 2016 7:29 pm

Thoglette wrote:
warthog1 wrote:Conti tyres size up bigger than other brands too. A 23 in a conti GP4000S is closer to a 25 in a Michelin or Schwalbe than it is a 23 IME.
Not on my bike - their "32" measured at 28mm. The Michelin came in at 32. Bottom line: YMMV
4000s ?

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Re: Go to 28mm or not?

Postby warthog1 » Wed Feb 03, 2016 9:07 pm

Mjainoz wrote:
Thoglette wrote:
warthog1 wrote:Conti tyres size up bigger than other brands too. A 23 in a conti GP4000S is closer to a 25 in a Michelin or Schwalbe than it is a 23 IME.
Not on my bike - their "32" measured at 28mm. The Michelin came in at 32. Bottom line: YMMV
4000s ?
Yes I am talking 4000S.
They are a large tyre for the advertised size
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Re: Go to 28mm or not?

Postby Mjainoz » Thu Feb 04, 2016 1:22 pm

I didn't know they made a 32. Thanks :)

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