25 or 28cc tyre?

Hello everyone, we want to buy tyre to our roadbikes do you recommend 25 or 28cc tyre to us?
We are not racing, we ride to enjoy.
Also we think buying the continental gatorskin? Is there anyone use it or should we look for anything else?
We are not racing, we ride to enjoy.
Also we think buying the continental gatorskin? Is there anyone use it or should we look for anything else?
0
Posts
Depends on what you want / how much you want to spend.
28mm Durano
Supposedly a tyre that meets the rim of the front tyre with less bulge has good aero benefits, so some might use a 25mm (or even 23mm in Conti GP40000S II case) up front and 28mm on the rear.
2017 Cube Attain GTC Pro Disc 2016
2016 Voodoo Wazoo
No question
I wasnt know that until that.
Our bikes are : KTM Strada 2000 (2015) and B'TWIN ULTRA 900 AF
I am not sure that I can use 28" with these bikes. What do you think?
Measure how much extra space you have around the 25mm tyre?
Under brake calipers
Under the fork crown
Inside seatstays
Inside chainstays
Think I'd want to have at least 5mm space round a 25 to comfortably run a 28mm tyre
The only part of the tyre that can affect momentum is the part that is in contact with the ground. On a 28c, there is more contact, so more momentum. Yes there is increased drag but. If drag from 1 inch of contact outweighs momentum from your 3ft legs then I'm afraid you are pretty weak.
You wouldn't expect an Olympic runner to wear trainers that have tread which is narrower than their feet.
The above post is using faulty physics. wider tyres are faster on rougher roads because you can run lower pressures/you have a bigger air cushion which result in slower vertical accelerations and and therefore less energy loss from the rider bike system. On smooth tarmac a narrower tyre is faster as vertical accelerations are not a problem and a narrower tyre can be run at higher pressures reducing rolling resistance and more importantly aerodynamic drag is lower. In the real world though you will struggle to notice a difference in speed between 25mm and 28mm tyres but the 28mm tyres are more comfortable on real roads and therefore overall are a tad faster.
Psuedo physics annoys me. I cant help correct it.
Either they didn't do a very good job of explaining, or you must have misheard them...
Voltaire
I was a late convert to 25s, but they're just so much more comfortable -- and for me comfort equals a better, longer rider. I'd run 28s if I had the clearance on my old steel frame.
I've gone from 25mm to 28mm Schwalbe Durano and there is a definite improvement in comfort. I run about 10 psi less now (50 F, 60 R, I weigh 60kg). May even try 32s next time...
WTAF????
Going back to 25 while I experiment with Mavic UST in my new wheelset. Will see how that goes.
I still prefer 23mm, but the roads where I ride are above UK-average smoothness, I'm light, and I prioritise speed and ride feel over "comfort". While I can detect/appreciate the difference in comfort with wider tyres run at lower pressures it's a minor variable for me personally, I don't like the more sluggish road feel, and they are definitely not any faster.