Go to 28mm or not?
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Go to 28mm or not?
Postby MTB99 » Wed Jan 27, 2016 7:42 pm
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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Re: Go to 28mm or not?
Postby open roader » Wed Jan 27, 2016 8:51 pm
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Re: Go to 28mm or not?
Postby silentbutdeadly » Wed Jan 27, 2016 10:33 pm
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Re: Go to 28mm or not?
Postby rodneycc » Wed Jan 27, 2016 10:35 pm
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Re: Go to 28mm or not?
Postby cyclotaur » Wed Jan 27, 2016 11:09 pm
I must say though I love my 28s. Must try them on my lighter stiffer wheels one day.
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Re: Go to 28mm or not?
Postby MTB99 » Thu Jan 28, 2016 6:07 am
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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Re: Go to 28mm or not?
Postby open roader » Thu Jan 28, 2016 7:39 am
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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Re: Go to 28mm or not?
Postby Patt0 » Sat Jan 30, 2016 12:11 pm
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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Re: Go to 28mm or not?
Postby Thoglette » Sat Jan 30, 2016 12:38 pm
The question should be: "can you go lower?" 28mm is still on the skinny side of the fence, especially with 100kg of load.Patt0 wrote: Can I go higher?
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
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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Re: Go to 28mm or not?
Postby foo on patrol » Sat Jan 30, 2016 8:54 pm
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Go to 28mm or not?
Postby Mjainoz » Sat Jan 30, 2016 9:23 pm
My 23s run 25mm wide on 25mm rims.
The 25s run near 28 wide on 25 rims.
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Re: Go to 28mm or not?
Postby Mulger bill » Sun Jan 31, 2016 12:13 am
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...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)
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Re: Go to 28mm or not?
Postby Duck! » Mon Feb 01, 2016 1:31 pm
Yes!foo on patrol wrote:Make sure they fit in ya forks, before buying!
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.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.
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Re: Go to 28mm or not?
Postby chill » Mon Feb 01, 2016 6:50 pm
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Re: Go to 28mm or not?
Postby tez001 » Tue Feb 02, 2016 7:27 pm
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Re: Go to 28mm or not?
Postby find_bruce » Tue Feb 02, 2016 7:49 pm
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 roadietez001 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?
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Re: Go to 28mm or not?
Postby tez001 » Tue Feb 02, 2016 8:36 pm
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
Take a look at the inflation chart and front/rear weight distribution at http://www.bikequarterly.com/images/TireDrop.pdfPatt0 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?
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Re: Go to 28mm or not?
Postby softy » Tue Feb 02, 2016 10:40 pm
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Re: Go to 28mm or not?
Postby warthog1 » Wed Feb 03, 2016 11:12 am
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.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)
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Re: Go to 28mm or not?
Postby Thoglette » Wed Feb 03, 2016 12:33 pm
Not on my bike - their "32" measured at 28mm. The Michelin came in at 32. Bottom line: YMMVwarthog1 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.
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Re: Go to 28mm or not?
Postby Mjainoz » Wed Feb 03, 2016 7:29 pm
4000s ?Thoglette wrote:Not on my bike - their "32" measured at 28mm. The Michelin came in at 32. Bottom line: YMMVwarthog1 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.
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Re: Go to 28mm or not?
Postby warthog1 » Wed Feb 03, 2016 9:07 pm
Yes I am talking 4000S.Mjainoz wrote:4000s ?Thoglette wrote:Not on my bike - their "32" measured at 28mm. The Michelin came in at 32. Bottom line: YMMVwarthog1 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.
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
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